libx48ng/src/init.c

#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#include "device.h"
#include "hp48.h"
#include "hp48_emu.h"
#include "resources.h"
#include "romio.h"

#define X48_MAGIC 0x48503438
#define NR_CONFIG 8

short rom_is_new = 1;
long ram_size;
long port1_size;
long port1_mask;
short port1_is_ram;
long port2_size;
long port2_mask;
short port2_is_ram;

typedef struct old_keystate_t {
    int rows[ 9 ];
} old_keystate_t;

typedef struct old_saturn_t {
    unsigned char A[ 16 ], B[ 16 ], C[ 16 ], D[ 16 ];
    long d[ 2 ];
    int P;
    long PC;
    unsigned char R0[ 16 ], R1[ 16 ], R2[ 16 ], R3[ 16 ], R4[ 16 ];
    unsigned char IN[ 4 ];
    unsigned char OUT[ 3 ];
    int CARRY;
    unsigned char PSTAT[ NR_PSTAT ];
    unsigned char XM, SB, SR, MP;
    unsigned char hexmode;
    long rstk[ NR_RSTK ];
    short rstkp;
    old_keystate_t keybuf;
    unsigned char intenable;
    unsigned char int_pending;
    unsigned char kbd_ien;
    long configs[ NR_CONFIG ];
    short daisy_state;
    long ram32k;
    long devices;
    unsigned char disp_io;
    unsigned char contrast_ctrl;
    unsigned char disp_test;
    unsigned int crc;
    unsigned char power_status;
    unsigned char power_ctrl;
    unsigned char mode;
    unsigned char annunc;
    unsigned char baud;
    unsigned char card_ctrl;
    unsigned char card_status;
    unsigned char io_ctrl;
    unsigned char rcs;
    unsigned char tcs;
    unsigned char rbr;
    unsigned char tbr;
    unsigned char sreq;
    unsigned char ir_ctrl;
    unsigned char base_off;
    unsigned char lcr;
    unsigned char lbr;
    unsigned char scratch;
    unsigned char base_nibble;
    long disp_addr;
    long line_offset;
    long line_count;
    long unknown;
    unsigned char t1_ctrl;
    unsigned char t2_ctrl;
    long menu_addr;
    long unknown2;
    int timer1;
    long timer2;
    long t1_instr;
    long t2_instr;
    unsigned char* rom;
    unsigned char* ram;
    unsigned char* port1;
    unsigned char* port2;
} old_saturn_t;

old_saturn_t old_saturn;

typedef struct saturn_0_3_0_t {
    unsigned long magic;
    char version[ 4 ];
    unsigned char A[ 16 ], B[ 16 ], C[ 16 ], D[ 16 ];
    word_20 d[ 2 ];
    word_4 P;
    word_20 PC;
    unsigned char R0[ 16 ], R1[ 16 ], R2[ 16 ], R3[ 16 ], R4[ 16 ];
    unsigned char IN[ 4 ];
    unsigned char OUT[ 3 ];
    word_1 CARRY;
    unsigned char PSTAT[ NR_PSTAT ];
    unsigned char XM, SB, SR, MP;
    word_4 hexmode;
    word_20 rstk[ NR_RSTK ];
    short rstkp;
    keystate_t keybuf;
    unsigned char intenable;
    unsigned char int_pending;
    unsigned char kbd_ien;
    word_20 configs[ NR_CONFIG ];
    word_16 daisy_state;
    word_20 ram32k;
    word_20 devices;
    word_4 disp_io;
    word_4 contrast_ctrl;
    word_8 disp_test;
    word_16 crc;
    word_4 power_status;
    word_4 power_ctrl;
    word_4 mode;
    word_8 annunc;
    word_4 baud;
    word_4 card_ctrl;
    word_4 card_status;
    word_4 io_ctrl;
    word_4 rcs;
    word_4 tcs;
    word_8 rbr;
    word_8 tbr;
    word_8 sreq;
    word_4 ir_ctrl;
    word_4 base_off;
    word_4 lcr;
    word_4 lbr;
    word_4 scratch;
    word_4 base_nibble;
    word_20 disp_addr;
    word_12 line_offset;
    word_8 line_count;
    word_16 unknown;
    word_4 t1_ctrl;
    word_4 t2_ctrl;
    word_20 menu_addr;
    word_8 unknown2;
    char timer1;
    word_32 timer2;
    long t1_instr;
    long t2_instr;
    short t1_tick;
    short t2_tick;
    long i_per_s;
    unsigned char* rom;
    unsigned char* ram;
    unsigned char* port1;
    unsigned char* port2;
} saturn_0_3_0_t;

saturn_0_3_0_t saturn_0_3_0;

#include "config.h"

void saturn_config_init( void ) {
    saturn.version[ 0 ] = VERSION_MAJOR;
    saturn.version[ 1 ] = VERSION_MINOR;
    saturn.version[ 2 ] = PATCHLEVEL;
    saturn.version[ 3 ] = COMPILE_VERSION;
    memset( &device, 0, sizeof( device ) );
    device.display_touched = 1;
    device.contrast_touched = 1;
    device.baud_touched = 1;
    device.ann_touched = 1;
    saturn.rcs = 0x0;
    saturn.tcs = 0x0;
    saturn.lbr = 0x0;
}

void init_saturn( void ) {
    int i;

    memset( &saturn, 0, sizeof( saturn ) - 4 * sizeof( unsigned char* ) );
    saturn.PC = 0x00000;
    saturn.magic = X48_MAGIC;
    saturn.t1_tick = 8192;
    saturn.t2_tick = 16;
    saturn.i_per_s = 0;
    saturn.version[ 0 ] = VERSION_MAJOR;
    saturn.version[ 1 ] = VERSION_MINOR;
    saturn.version[ 2 ] = PATCHLEVEL;
    saturn.version[ 3 ] = COMPILE_VERSION;
    saturn.hexmode = HEX;
    saturn.rstkp = -1;
    saturn.intenable = 1;
    saturn.int_pending = 0;
    saturn.kbd_ien = 1;
    saturn.timer1 = 0;
    saturn.timer2 = 0x2000;
    saturn.bank_switch = 0;
    for ( i = 0; i < NR_MCTL; i++ ) {
        if ( i == 0 )
            saturn.mem_cntl[ i ].unconfigured = 1;
        else if ( i == 5 )
            saturn.mem_cntl[ i ].unconfigured = 0;
        else
            saturn.mem_cntl[ i ].unconfigured = 2;
        saturn.mem_cntl[ i ].config[ 0 ] = 0;
        saturn.mem_cntl[ i ].config[ 1 ] = 0;
    }
    dev_memory_init();
}

void copy_old_saturn( old_saturn_t* old, saturn_t* new ) {
    int i;

    memcpy( &( new->A[ 0 ] ), &( old->A[ 0 ] ), 16 );
    memcpy( &( new->B[ 0 ] ), &( old->B[ 0 ] ), 16 );
    memcpy( &( new->C[ 0 ] ), &( old->C[ 0 ] ), 16 );
    memcpy( &( new->D[ 0 ] ), &( old->D[ 0 ] ), 16 );
    new->d[ 0 ] = old->d[ 0 ];
    new->d[ 1 ] = old->d[ 1 ];
    new->P = old->P;
    new->PC = old->PC;
    memcpy( &( new->R0[ 0 ] ), &( old->R0[ 0 ] ), 16 );
    memcpy( &( new->R1[ 0 ] ), &( old->R1[ 0 ] ), 16 );
    memcpy( &( new->R2[ 0 ] ), &( old->R2[ 0 ] ), 16 );
    memcpy( &( new->R3[ 0 ] ), &( old->R3[ 0 ] ), 16 );
    memcpy( &( new->R4[ 0 ] ), &( old->R4[ 0 ] ), 16 );
    memcpy( &( new->IN[ 0 ] ), &( old->IN[ 0 ] ), 4 );
    memcpy( &( new->OUT[ 0 ] ), &( old->OUT[ 0 ] ), 3 );
    new->CARRY = old->CARRY;
    memcpy( &( new->PSTAT[ 0 ] ), &( old->PSTAT[ 0 ] ), NR_PSTAT );
    new->XM = old->XM;
    new->SB = old->SB;
    new->SR = old->SR;
    new->MP = old->MP;
    new->hexmode = old->hexmode;
    memcpy( &( new->rstk[ 0 ] ), &( old->rstk[ 0 ] ),
            NR_RSTK * sizeof( word_20 ) );
    new->rstkp = old->rstkp;
    for ( i = 0; i < 9; i++ ) {
        new->keybuf.rows[ i ] = old->keybuf.rows[ i ];
    }
    new->intenable = old->intenable;
    new->int_pending = old->int_pending;
    new->kbd_ien = old->kbd_ien;
    new->disp_io = old->disp_io;
    new->contrast_ctrl = old->contrast_ctrl;
    new->disp_test = old->disp_test;
    new->crc = old->crc;
    new->power_status = old->power_status;
    new->power_ctrl = old->power_ctrl;
    new->mode = old->mode;
    new->annunc = old->annunc;
    new->baud = old->baud;
    new->card_ctrl = old->card_ctrl;
    new->card_status = old->card_status;
    new->io_ctrl = old->io_ctrl;
    new->rcs = old->rcs;
    new->tcs = old->tcs;
    new->rbr = old->rbr;
    new->tbr = old->tbr;
    new->sreq = old->sreq;
    new->ir_ctrl = old->ir_ctrl;
    new->base_off = old->base_off;
    new->lcr = old->lcr;
    new->lbr = old->lbr;
    new->scratch = old->scratch;
    new->base_nibble = old->base_nibble;
    new->disp_addr = old->disp_addr;
    new->line_offset = old->line_offset;
    new->line_count = old->line_count;
    new->unknown = old->unknown;
    new->t1_ctrl = old->t1_ctrl;
    new->t2_ctrl = old->t2_ctrl;
    new->menu_addr = old->menu_addr;
    new->unknown2 = old->unknown2;
    new->timer1 = old->timer1;
    new->timer2 = old->timer2;
    new->t1_instr = old->t1_instr;
    new->t2_instr = old->t2_instr;
    new->bank_switch = 0;
    if ( opt_gx ) {
        new->mem_cntl[ 0 ].unconfigured = 0;
        new->mem_cntl[ 0 ].config[ 0 ] = 0x00100;
        new->mem_cntl[ 1 ].unconfigured = 0;
        new->mem_cntl[ 1 ].config[ 0 ] = 0x80000;
        new->mem_cntl[ 1 ].config[ 1 ] = 0xc0000;
        new->mem_cntl[ 2 ].unconfigured = 0;
        new->mem_cntl[ 2 ].config[ 0 ] = 0x7f000;
        new->mem_cntl[ 2 ].config[ 1 ] = 0xff000;
        new->mem_cntl[ 3 ].unconfigured = 0;
        new->mem_cntl[ 3 ].config[ 0 ] = 0xc0000;
        new->mem_cntl[ 3 ].config[ 1 ] = 0xc0000;
        new->mem_cntl[ 4 ].unconfigured = 0;
        new->mem_cntl[ 4 ].config[ 0 ] = 0xc0000;
        new->mem_cntl[ 4 ].config[ 1 ] = 0xc0000;
        new->mem_cntl[ 5 ].unconfigured = 0;
        new->mem_cntl[ 5 ].config[ 0 ] = 0x00000;
        new->mem_cntl[ 5 ].config[ 1 ] = 0x00000;
    } else {
        if ( old->devices == 0x100 ) {
            new->mem_cntl[ 0 ].unconfigured = 0;
            new->mem_cntl[ 0 ].config[ 0 ] = old->devices;
        } else {
            new->mem_cntl[ 0 ].unconfigured = 1;
            new->mem_cntl[ 0 ].config[ 0 ] = 0x00000;
        }
        if ( old->ram32k == 0x70000 ) {
            new->mem_cntl[ 1 ].unconfigured = 0;
            new->mem_cntl[ 1 ].config[ 0 ] = 0x70000;
            new->mem_cntl[ 1 ].config[ 1 ] = 0xf0000;
        } else if ( old->ram32k == 0xf0000 ) {
            new->mem_cntl[ 1 ].unconfigured = 0;
            new->mem_cntl[ 1 ].config[ 0 ] = 0xf0000;
            new->mem_cntl[ 1 ].config[ 1 ] = 0xf0000;
        } else if ( old->ram32k == 0xfc000 ) {
            new->mem_cntl[ 1 ].unconfigured = 0;
            new->mem_cntl[ 1 ].config[ 0 ] = 0x70000;
            new->mem_cntl[ 1 ].config[ 1 ] = 0xfc000;
        } else if ( old->ram32k == 0xfe000 ) {
            new->mem_cntl[ 1 ].unconfigured = 0;
            new->mem_cntl[ 1 ].config[ 0 ] = 0x70000;
            new->mem_cntl[ 1 ].config[ 1 ] = 0xfe000;
        } else {
            new->mem_cntl[ 1 ].unconfigured = 2;
            new->mem_cntl[ 1 ].config[ 0 ] = 0x00000;
            new->mem_cntl[ 1 ].config[ 1 ] = 0x00000;
        }
        new->mem_cntl[ 2 ].unconfigured = 0;
        new->mem_cntl[ 2 ].config[ 0 ] = 0x80000;
        new->mem_cntl[ 2 ].config[ 1 ] = 0xc0000;
        new->mem_cntl[ 3 ].unconfigured = 0;
        new->mem_cntl[ 3 ].config[ 0 ] = 0xc0000;
        new->mem_cntl[ 3 ].config[ 1 ] = 0xc0000;
        new->mem_cntl[ 4 ].unconfigured = 0;
        new->mem_cntl[ 4 ].config[ 0 ] = 0xd0000;
        new->mem_cntl[ 4 ].config[ 1 ] = 0xff000;
        new->mem_cntl[ 5 ].unconfigured = 0;
        new->mem_cntl[ 5 ].config[ 0 ] = 0x00000;
        new->mem_cntl[ 5 ].config[ 1 ] = 0x80000;
    }
}

void copy_0_3_0_saturn( saturn_0_3_0_t* old, saturn_t* new ) {
    int i;

    memcpy( &( new->A[ 0 ] ), &( old->A[ 0 ] ), 16 );
    memcpy( &( new->B[ 0 ] ), &( old->B[ 0 ] ), 16 );
    memcpy( &( new->C[ 0 ] ), &( old->C[ 0 ] ), 16 );
    memcpy( &( new->D[ 0 ] ), &( old->D[ 0 ] ), 16 );
    new->d[ 0 ] = old->d[ 0 ];
    new->d[ 1 ] = old->d[ 1 ];
    new->P = old->P;
    new->PC = old->PC;
    memcpy( &( new->R0[ 0 ] ), &( old->R0[ 0 ] ), 16 );
    memcpy( &( new->R1[ 0 ] ), &( old->R1[ 0 ] ), 16 );
    memcpy( &( new->R2[ 0 ] ), &( old->R2[ 0 ] ), 16 );
    memcpy( &( new->R3[ 0 ] ), &( old->R3[ 0 ] ), 16 );
    memcpy( &( new->R4[ 0 ] ), &( old->R4[ 0 ] ), 16 );
    memcpy( &( new->IN[ 0 ] ), &( old->IN[ 0 ] ), 4 );
    memcpy( &( new->OUT[ 0 ] ), &( old->OUT[ 0 ] ), 3 );
    new->CARRY = old->CARRY;
    memcpy( &( new->PSTAT[ 0 ] ), &( old->PSTAT[ 0 ] ), NR_PSTAT );
    new->XM = old->XM;
    new->SB = old->SB;
    new->SR = old->SR;
    new->MP = old->MP;
    new->hexmode = old->hexmode;
    memcpy( &( new->rstk[ 0 ] ), &( old->rstk[ 0 ] ),
            NR_RSTK * sizeof( word_20 ) );
    new->rstkp = old->rstkp;
    for ( i = 0; i < 9; i++ ) {
        new->keybuf.rows[ i ] = old->keybuf.rows[ i ];
    }
    new->intenable = old->intenable;
    new->int_pending = old->int_pending;
    new->kbd_ien = old->kbd_ien;
    new->disp_io = old->disp_io;
    new->contrast_ctrl = old->contrast_ctrl;
    new->disp_test = old->disp_test;
    new->crc = old->crc;
    new->power_status = old->power_status;
    new->power_ctrl = old->power_ctrl;
    new->mode = old->mode;
    new->annunc = old->annunc;
    new->baud = old->baud;
    new->card_ctrl = old->card_ctrl;
    new->card_status = old->card_status;
    new->io_ctrl = old->io_ctrl;
    new->rcs = old->rcs;
    new->tcs = old->tcs;
    new->rbr = old->rbr;
    new->tbr = old->tbr;
    new->sreq = old->sreq;
    new->ir_ctrl = old->ir_ctrl;
    new->base_off = old->base_off;
    new->lcr = old->lcr;
    new->lbr = old->lbr;
    new->scratch = old->scratch;
    new->base_nibble = old->base_nibble;
    new->disp_addr = old->disp_addr;
    new->line_offset = old->line_offset;
    new->line_count = old->line_count;
    new->unknown = old->unknown;
    new->t1_ctrl = old->t1_ctrl;
    new->t2_ctrl = old->t2_ctrl;
    new->menu_addr = old->menu_addr;
    new->unknown2 = old->unknown2;
    new->timer1 = old->timer1;
    new->timer2 = old->timer2;
    new->t1_instr = old->t1_instr;
    new->t2_instr = old->t2_instr;
    new->t1_tick = old->t1_tick;
    new->t2_tick = old->t2_tick;
    new->i_per_s = old->i_per_s;
    new->bank_switch = 0;
    if ( opt_gx ) {
        new->mem_cntl[ 0 ].unconfigured = 0;
        new->mem_cntl[ 0 ].config[ 0 ] = 0x00100;
        new->mem_cntl[ 1 ].unconfigured = 0;
        new->mem_cntl[ 1 ].config[ 0 ] = 0x80000;
        new->mem_cntl[ 1 ].config[ 1 ] = 0xc0000;
        new->mem_cntl[ 2 ].unconfigured = 0;
        new->mem_cntl[ 2 ].config[ 0 ] = 0x7f000;
        new->mem_cntl[ 2 ].config[ 1 ] = 0xff000;
        new->mem_cntl[ 3 ].unconfigured = 0;
        new->mem_cntl[ 3 ].config[ 0 ] = 0xc0000;
        new->mem_cntl[ 3 ].config[ 1 ] = 0xc0000;
        new->mem_cntl[ 4 ].unconfigured = 0;
        new->mem_cntl[ 4 ].config[ 0 ] = 0xc0000;
        new->mem_cntl[ 4 ].config[ 1 ] = 0xc0000;
        new->mem_cntl[ 5 ].unconfigured = 0;
        new->mem_cntl[ 5 ].config[ 0 ] = 0x00000;
        new->mem_cntl[ 5 ].config[ 1 ] = 0x00000;
    } else {
        if ( old->devices == 0x100 ) {
            new->mem_cntl[ 0 ].unconfigured = 0;
            new->mem_cntl[ 0 ].config[ 0 ] = old->devices;
        } else {
            new->mem_cntl[ 0 ].unconfigured = 1;
            new->mem_cntl[ 0 ].config[ 0 ] = 0x00000;
        }
        if ( old->ram32k == 0x70000 ) {
            new->mem_cntl[ 1 ].unconfigured = 0;
            new->mem_cntl[ 1 ].config[ 0 ] = 0x70000;
            new->mem_cntl[ 1 ].config[ 1 ] = 0xf0000;
        } else if ( old->ram32k == 0xf0000 ) {
            new->mem_cntl[ 1 ].unconfigured = 0;
            new->mem_cntl[ 1 ].config[ 0 ] = 0xf0000;
            new->mem_cntl[ 1 ].config[ 1 ] = 0xf0000;
        } else if ( old->ram32k == 0xfc000 ) {
            new->mem_cntl[ 1 ].unconfigured = 0;
            new->mem_cntl[ 1 ].config[ 0 ] = 0x70000;
            new->mem_cntl[ 1 ].config[ 1 ] = 0xfc000;
        } else if ( old->ram32k == 0xfe000 ) {
            new->mem_cntl[ 1 ].unconfigured = 0;
            new->mem_cntl[ 1 ].config[ 0 ] = 0x70000;
            new->mem_cntl[ 1 ].config[ 1 ] = 0xfe000;
        } else {
            new->mem_cntl[ 1 ].unconfigured = 2;
            new->mem_cntl[ 1 ].config[ 0 ] = 0x00000;
            new->mem_cntl[ 1 ].config[ 1 ] = 0x00000;
        }
        new->mem_cntl[ 2 ].unconfigured = 0;
        new->mem_cntl[ 2 ].config[ 0 ] = 0x80000;
        new->mem_cntl[ 2 ].config[ 1 ] = 0xc0000;
        new->mem_cntl[ 3 ].unconfigured = 0;
        new->mem_cntl[ 3 ].config[ 0 ] = 0xc0000;
        new->mem_cntl[ 3 ].config[ 1 ] = 0xc0000;
        new->mem_cntl[ 4 ].unconfigured = 0;
        new->mem_cntl[ 4 ].config[ 0 ] = 0xd0000;
        new->mem_cntl[ 4 ].config[ 1 ] = 0xff000;
        new->mem_cntl[ 5 ].unconfigured = 0;
        new->mem_cntl[ 5 ].config[ 0 ] = 0x00000;
        new->mem_cntl[ 5 ].config[ 1 ] = 0x80000;
    }
}

int read_8( FILE* fp, word_8* var ) {
    unsigned char tmp;

    if ( fread( &tmp, 1, 1, fp ) != 1 ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t read word_8\n", progname );
        return 0;
    }
    *var = tmp;
    return 1;
}

int read_char( FILE* fp, char* var ) {
    char tmp;

    if ( fread( &tmp, 1, 1, fp ) != 1 ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t read char\n", progname );
        return 0;
    }
    *var = tmp;
    return 1;
}

int read_16( FILE* fp, word_16* var ) {
    unsigned char tmp[ 2 ];

    if ( fread( &tmp[ 0 ], 1, 2, fp ) != 2 ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t read word_16\n", progname );
        return 0;
    }
    *var = tmp[ 0 ] << 8;
    *var |= tmp[ 1 ];
    return 1;
}

int read_32( FILE* fp, word_32* var ) {
    unsigned char tmp[ 4 ];

    if ( fread( &tmp[ 0 ], 1, 4, fp ) != 4 ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t read word_32\n", progname );
        return 0;
    }
    *var = tmp[ 0 ] << 24;
    *var |= tmp[ 1 ] << 16;
    *var |= tmp[ 2 ] << 8;
    *var |= tmp[ 3 ];
    return 1;
}

int read_u_long( FILE* fp, unsigned long* var ) {
    unsigned char tmp[ 4 ];

    if ( fread( &tmp[ 0 ], 1, 4, fp ) != 4 ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t read unsigned long\n", progname );
        return 0;
    }
    *var = tmp[ 0 ] << 24;
    *var |= tmp[ 1 ] << 16;
    *var |= tmp[ 2 ] << 8;
    *var |= tmp[ 3 ];
    return 1;
}

int read_version_0_3_0_file( FILE* fp ) {
    int i;

    /*
     * version 0.3.x, read in the saturn_0_3_0_t struct
     */
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn_0_3_0.A[ i ] ) )
            return 0;
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn_0_3_0.B[ i ] ) )
            return 0;
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn_0_3_0.C[ i ] ) )
            return 0;
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn_0_3_0.D[ i ] ) )
            return 0;
    if ( !read_32( fp, &saturn_0_3_0.d[ 0 ] ) )
        return 0;
    if ( !read_32( fp, &saturn_0_3_0.d[ 1 ] ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.P ) )
        return 0;
    if ( !read_32( fp, &saturn_0_3_0.PC ) )
        return 0;
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn_0_3_0.R0[ i ] ) )
            return 0;
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn_0_3_0.R1[ i ] ) )
            return 0;
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn_0_3_0.R2[ i ] ) )
            return 0;
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn_0_3_0.R3[ i ] ) )
            return 0;
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn_0_3_0.R4[ i ] ) )
            return 0;
    for ( i = 0; i < 4; i++ )
        if ( !read_8( fp, &saturn_0_3_0.IN[ i ] ) )
            return 0;
    for ( i = 0; i < 3; i++ )
        if ( !read_8( fp, &saturn_0_3_0.OUT[ i ] ) )
            return 0;
    if ( !read_8( fp, &saturn_0_3_0.CARRY ) )
        return 0;
    for ( i = 0; i < NR_PSTAT; i++ )
        if ( !read_8( fp, &saturn_0_3_0.PSTAT[ i ] ) )
            return 0;
    if ( !read_8( fp, &saturn_0_3_0.XM ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.SB ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.SR ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.MP ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.hexmode ) )
        return 0;
    for ( i = 0; i < NR_RSTK; i++ )
        if ( !read_32( fp, &saturn_0_3_0.rstk[ i ] ) )
            return 0;
    if ( !read_16( fp, ( word_16* )&saturn_0_3_0.rstkp ) )
        return 0;
    for ( i = 0; i < 9; i++ )
        if ( !read_16( fp, ( word_16* )&saturn_0_3_0.keybuf.rows[ i ] ) )
            return 0;
    if ( !read_8( fp, &saturn_0_3_0.intenable ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.int_pending ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.kbd_ien ) )
        return 0;
    for ( i = 0; i < NR_CONFIG; i++ )
        if ( !read_32( fp, &saturn_0_3_0.configs[ i ] ) )
            return 0;
    if ( !read_16( fp, ( word_16* )&saturn_0_3_0.daisy_state ) )
        return 0;
    if ( !read_32( fp, &saturn_0_3_0.ram32k ) )
        return 0;
    if ( !read_32( fp, &saturn_0_3_0.devices ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.disp_io ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.contrast_ctrl ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.disp_test ) )
        return 0;
    if ( !read_16( fp, &saturn_0_3_0.crc ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.power_status ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.power_ctrl ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.mode ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.annunc ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.baud ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.card_ctrl ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.card_status ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.io_ctrl ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.rcs ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.tcs ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.rbr ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.tbr ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.sreq ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.ir_ctrl ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.base_off ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.lcr ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.lbr ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.scratch ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.base_nibble ) )
        return 0;
    if ( !read_32( fp, &saturn_0_3_0.disp_addr ) )
        return 0;
    if ( !read_16( fp, &saturn_0_3_0.line_offset ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.line_count ) )
        return 0;
    if ( !read_16( fp, &saturn_0_3_0.unknown ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.t1_ctrl ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.t2_ctrl ) )
        return 0;
    if ( !read_32( fp, &saturn_0_3_0.menu_addr ) )
        return 0;
    if ( !read_8( fp, &saturn_0_3_0.unknown2 ) )
        return 0;
    if ( !read_char( fp, &saturn_0_3_0.timer1 ) )
        return 0;
    if ( !read_32( fp, &saturn_0_3_0.timer2 ) )
        return 0;
    if ( !read_32( fp, &saturn_0_3_0.t1_instr ) )
        return 0;
    if ( !read_32( fp, &saturn_0_3_0.t2_instr ) )
        return 0;
    if ( !read_16( fp, ( word_16* )&saturn_0_3_0.t1_tick ) )
        return 0;
    if ( !read_16( fp, ( word_16* )&saturn_0_3_0.t2_tick ) )
        return 0;
    if ( !read_32( fp, &saturn_0_3_0.i_per_s ) )
        return 0;
    return 1;
}

int read_version_0_4_0_file( FILE* fp ) {
    int i;

    /*
     * version 0.4.x, read in the saturn_t struct
     */
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn.A[ i ] ) )
            return 0;
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn.B[ i ] ) )
            return 0;
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn.C[ i ] ) )
            return 0;
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn.D[ i ] ) )
            return 0;
    if ( !read_32( fp, &saturn.d[ 0 ] ) )
        return 0;
    if ( !read_32( fp, &saturn.d[ 1 ] ) )
        return 0;
    if ( !read_8( fp, &saturn.P ) )
        return 0;
    if ( !read_32( fp, &saturn.PC ) )
        return 0;
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn.R0[ i ] ) )
            return 0;
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn.R1[ i ] ) )
            return 0;
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn.R2[ i ] ) )
            return 0;
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn.R3[ i ] ) )
            return 0;
    for ( i = 0; i < 16; i++ )
        if ( !read_8( fp, &saturn.R4[ i ] ) )
            return 0;
    for ( i = 0; i < 4; i++ )
        if ( !read_8( fp, &saturn.IN[ i ] ) )
            return 0;
    for ( i = 0; i < 3; i++ )
        if ( !read_8( fp, &saturn.OUT[ i ] ) )
            return 0;
    if ( !read_8( fp, &saturn.CARRY ) )
        return 0;
    for ( i = 0; i < NR_PSTAT; i++ )
        if ( !read_8( fp, &saturn.PSTAT[ i ] ) )
            return 0;
    if ( !read_8( fp, &saturn.XM ) )
        return 0;
    if ( !read_8( fp, &saturn.SB ) )
        return 0;
    if ( !read_8( fp, &saturn.SR ) )
        return 0;
    if ( !read_8( fp, &saturn.MP ) )
        return 0;
    if ( !read_8( fp, &saturn.hexmode ) )
        return 0;
    for ( i = 0; i < NR_RSTK; i++ )
        if ( !read_32( fp, &saturn.rstk[ i ] ) )
            return 0;
    if ( !read_16( fp, ( word_16* )&saturn.rstkp ) )
        return 0;
    for ( i = 0; i < 9; i++ )
        if ( !read_16( fp, ( word_16* )&saturn.keybuf.rows[ i ] ) )
            return 0;
    if ( !read_8( fp, &saturn.intenable ) )
        return 0;
    if ( !read_8( fp, &saturn.int_pending ) )
        return 0;
    if ( !read_8( fp, &saturn.kbd_ien ) )
        return 0;
    if ( !read_8( fp, &saturn.disp_io ) )
        return 0;
    if ( !read_8( fp, &saturn.contrast_ctrl ) )
        return 0;
    if ( !read_8( fp, &saturn.disp_test ) )
        return 0;
    if ( !read_16( fp, &saturn.crc ) )
        return 0;
    if ( !read_8( fp, &saturn.power_status ) )
        return 0;
    if ( !read_8( fp, &saturn.power_ctrl ) )
        return 0;
    if ( !read_8( fp, &saturn.mode ) )
        return 0;
    if ( !read_8( fp, &saturn.annunc ) )
        return 0;
    if ( !read_8( fp, &saturn.baud ) )
        return 0;
    if ( !read_8( fp, &saturn.card_ctrl ) )
        return 0;
    if ( !read_8( fp, &saturn.card_status ) )
        return 0;
    if ( !read_8( fp, &saturn.io_ctrl ) )
        return 0;
    if ( !read_8( fp, &saturn.rcs ) )
        return 0;
    if ( !read_8( fp, &saturn.tcs ) )
        return 0;
    if ( !read_8( fp, &saturn.rbr ) )
        return 0;
    if ( !read_8( fp, &saturn.tbr ) )
        return 0;
    if ( !read_8( fp, &saturn.sreq ) )
        return 0;
    if ( !read_8( fp, &saturn.ir_ctrl ) )
        return 0;
    if ( !read_8( fp, &saturn.base_off ) )
        return 0;
    if ( !read_8( fp, &saturn.lcr ) )
        return 0;
    if ( !read_8( fp, &saturn.lbr ) )
        return 0;
    if ( !read_8( fp, &saturn.scratch ) )
        return 0;
    if ( !read_8( fp, &saturn.base_nibble ) )
        return 0;
    if ( !read_32( fp, &saturn.disp_addr ) )
        return 0;
    if ( !read_16( fp, &saturn.line_offset ) )
        return 0;
    if ( !read_8( fp, &saturn.line_count ) )
        return 0;
    if ( !read_16( fp, &saturn.unknown ) )
        return 0;
    if ( !read_8( fp, &saturn.t1_ctrl ) )
        return 0;
    if ( !read_8( fp, &saturn.t2_ctrl ) )
        return 0;
    if ( !read_32( fp, &saturn.menu_addr ) )
        return 0;
    if ( !read_8( fp, &saturn.unknown2 ) )
        return 0;
    if ( !read_char( fp, &saturn.timer1 ) )
        return 0;
    if ( !read_32( fp, &saturn.timer2 ) )
        return 0;
    if ( !read_32( fp, &saturn.t1_instr ) )
        return 0;
    if ( !read_32( fp, &saturn.t2_instr ) )
        return 0;
    if ( !read_16( fp, ( word_16* )&saturn.t1_tick ) )
        return 0;
    if ( !read_16( fp, ( word_16* )&saturn.t2_tick ) )
        return 0;
    if ( !read_32( fp, &saturn.i_per_s ) )
        return 0;
    if ( !read_16( fp, ( word_16* )&saturn.bank_switch ) )
        return 0;
    for ( i = 0; i < NR_MCTL; i++ ) {
        if ( !read_16( fp, &saturn.mem_cntl[ i ].unconfigured ) )
            return 0;
        if ( !read_32( fp, &saturn.mem_cntl[ i ].config[ 0 ] ) )
            return 0;
        if ( !read_32( fp, &saturn.mem_cntl[ i ].config[ 1 ] ) )
            return 0;
    }
    return 1;
}

int read_mem_file( char* name, word_4* mem, int size ) {
    struct stat st;
    FILE* fp;
    word_8* tmp_mem;
    word_8 byte;
    int i, j;

    if ( NULL == ( fp = fopen( name, "r" ) ) ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t open %s\n", progname, name );
        return 0;
    }

    if ( stat( name, &st ) < 0 ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t stat %s\n", progname, name );
        return 0;
    }

    if ( st.st_size == size ) {
        /*
         * size is same as memory size, old version file
         */
        if ( fread( mem, 1, ( size_t )size, fp ) != size ) {
            if ( !quiet )
                fprintf( stderr, "%s: can\'t read %s\n", progname, name );
            fclose( fp );
            return 0;
        }
    } else {
        /*
         * size is different, check size and decompress memory
         */

        if ( st.st_size != size / 2 ) {
            if ( !quiet )
                fprintf( stderr,
                         "%s: strange size %s, expected %d, found %ld\n",
                         progname, name, size / 2, st.st_size );
            fclose( fp );
            return 0;
        }

        if ( NULL == ( tmp_mem = ( word_8* )malloc( ( size_t )st.st_size ) ) ) {
            for ( i = 0, j = 0; i < size / 2; i++ ) {
                if ( 1 != fread( &byte, 1, 1, fp ) ) {
                    if ( !quiet )
                        fprintf( stderr, "%s: can\'t read %s\n", progname,
                                 name );
                    fclose( fp );
                    return 0;
                }
                mem[ j++ ] = ( word_4 )( ( int )byte & 0xf );
                mem[ j++ ] = ( word_4 )( ( ( int )byte >> 4 ) & 0xf );
            }
        } else {
            if ( fread( tmp_mem, 1, ( size_t )size / 2, fp ) != size / 2 ) {
                if ( !quiet )
                    fprintf( stderr, "%s: can\'t read %s\n", progname, name );
                fclose( fp );
                free( tmp_mem );
                return 0;
            }

            for ( i = 0, j = 0; i < size / 2; i++ ) {
                mem[ j++ ] = ( word_4 )( ( int )tmp_mem[ i ] & 0xf );
                mem[ j++ ] = ( word_4 )( ( ( int )tmp_mem[ i ] >> 4 ) & 0xf );
            }

            free( tmp_mem );
        }
    }

    fclose( fp );

    if ( verbose )
        printf( "%s: read %s\n", progname, name );

    return 1;
}

int read_rom( const char* fname ) {
    int ram_size;

    if ( !read_rom_file( romFileName, &saturn.rom, &rom_size ) )
        return 0;
    dev_memory_init();

    if ( opt_gx )
        ram_size = RAM_SIZE_GX;
    else
        ram_size = RAM_SIZE_SX;

    if ( NULL == ( saturn.ram = ( word_4* )malloc( ram_size ) ) ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t malloc RAM\n", progname );
        return 0;
    }

    memset( saturn.ram, 0, ram_size );

    port1_size = 0;
    port1_mask = 0;
    port1_is_ram = 0;
    saturn.port1 = ( unsigned char* )0;

    port2_size = 0;
    port2_mask = 0;
    port2_is_ram = 0;
    saturn.port2 = ( unsigned char* )0;

    saturn.card_status = 0;

    return 1;
}

void get_home_directory( char* path ) {
    char* p;
    struct passwd* pwd;

    if ( homeDirectory[ 0 ] == '/' ) {
        strcpy( path, homeDirectory );
    } else {
        p = getenv( "HOME" );
        if ( p ) {
            strcpy( path, p );
            strcat( path, "/" );
        } else {
            pwd = getpwuid( getuid() );
            if ( pwd ) {
                strcpy( path, pwd->pw_dir );
                strcat( path, "/" );
            } else {
                if ( !quiet )
                    fprintf( stderr,
                             "%s: can\'t figure out your home directory, "
                             "trying /tmp\n",
                             progname );
                strcpy( path, "/tmp" );
            }
        }
        strcat( path, homeDirectory );
    }
}

int read_files( void ) {
    char path[ 1024 ];
    char fnam[ 1024 ];
    unsigned long v1, v2;
    int i, read_version;
    int ram_size;
    struct stat st;
    FILE* fp;

    get_home_directory( path );
    strcat( path, "/" );

    saturn.rom = ( word_4* )NULL;
    strcpy( fnam, path );
    strcat( fnam, "rom" );
    if ( !read_rom_file( fnam, &saturn.rom, &rom_size ) )
        return 0;

    rom_is_new = 0;

    strcpy( fnam, path );
    strcat( fnam, "hp48" );
    if ( NULL == ( fp = fopen( fnam, "r" ) ) ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t open %s\n", progname, fnam );
        return 0;
    }

    /*
     * ok, file is open, try to read the MAGIC number
     */
    read_u_long( fp, &saturn.magic );

    if ( X48_MAGIC != saturn.magic ) {
        /*
         * no MAGIC number, try to read old format file
         */
        fseek( fp, 0, SEEK_SET );
        if ( fread( ( char* )&old_saturn, 1, sizeof( old_saturn ), fp ) ==
             sizeof( old_saturn ) ) {
            /*
             * seems to work
             */
            copy_old_saturn( &old_saturn, &saturn );
            if ( !quiet )
                fprintf( stderr, "%s: %s seems to be an old version file\n",
                         progname, fnam );
            saturn.magic = X48_MAGIC;
            saturn.t1_tick = 8192;
            saturn.t2_tick = 16;
            saturn.i_per_s = 0;
            saturn.version[ 0 ] = VERSION_MAJOR;
            saturn.version[ 1 ] = VERSION_MINOR;
            saturn.version[ 2 ] = PATCHLEVEL;
            saturn.version[ 3 ] = COMPILE_VERSION;
        } else {
            /*
             * no, initialize
             */
            if ( !quiet )
                fprintf( stderr, "%s: can\'t handle %s\n", progname, fnam );
            init_saturn();
        }
    } else {
        /*
         * MAGIC ok, read and compare the version
         */
        read_version = 1;
        for ( i = 0; i < 4; i++ ) {
            if ( !read_char( fp, &saturn.version[ i ] ) ) {
                if ( !quiet )
                    fprintf( stderr, "%s: can\'t read version\n", progname );
                read_version = 0;
            }
        }

        if ( read_version ) {
            v1 = ( ( int )saturn.version[ 0 ] & 0xff ) << 24;
            v1 |= ( ( int )saturn.version[ 1 ] & 0xff ) << 16;
            v1 |= ( ( int )saturn.version[ 2 ] & 0xff ) << 8;
            v1 |= ( ( int )saturn.version[ 3 ] & 0xff );
            v2 = ( ( int )VERSION_MAJOR & 0xff ) << 24;
            v2 |= ( ( int )VERSION_MINOR & 0xff ) << 16;
            v2 |= ( ( int )PATCHLEVEL & 0xff ) << 8;
            v2 |= ( ( int )COMPILE_VERSION & 0xff );

            if ( ( v1 & 0xffffff00 ) < ( v2 & 0xffffff00 ) ) {
                if ( !quiet )
                    fprintf( stderr,
                             "%s: %s is a version %d.%d.%d file, converting\n",
                             progname, fnam, saturn.version[ 0 ],
                             saturn.version[ 1 ], saturn.version[ 2 ] );
            } else if ( ( v2 & 0xffffff00 ) < ( v1 & 0xffffff00 ) ) {
                if ( !quiet )
                    fprintf( stderr,
                             "%s: %s is a version %d.%d.%d file, trying ...\n",
                             progname, fnam, saturn.version[ 0 ],
                             saturn.version[ 1 ], saturn.version[ 2 ] );
            }

            if ( v1 < 0x00040000 ) {
                /*
                 * read version < 0.4 file
                 */
                if ( !read_version_0_3_0_file( fp ) ) {
                    if ( !quiet )
                        fprintf( stderr, "%s: can\'t handle %s\n", progname,
                                 fnam );
                    init_saturn();
                } else {
                    copy_0_3_0_saturn( &saturn_0_3_0, &saturn );
                    if ( verbose )
                        printf( "%s: read %s\n", progname, fnam );
                }
            } else if ( v1 <= v2 ) {
                /*
                 * read latest version file
                 */
                if ( !read_version_0_4_0_file( fp ) ) {
                    if ( !quiet )
                        fprintf( stderr, "%s: can\'t handle %s\n", progname,
                                 fnam );
                    init_saturn();
                } else if ( verbose ) {
                    printf( "%s: read %s\n", progname, fnam );
                }
            } else {
                /*
                 * try to read latest version file
                 */
                if ( !read_version_0_4_0_file( fp ) ) {
                    if ( !quiet )
                        fprintf( stderr, "%s: can\'t handle %s\n", progname,
                                 fnam );
                    init_saturn();
                } else if ( verbose ) {
                    printf( "%s: read %s\n", progname, fnam );
                }
            }
        }
    }
    fclose( fp );

    dev_memory_init();

    saturn_config_init();

    if ( opt_gx )
        ram_size = RAM_SIZE_GX;
    else
        ram_size = RAM_SIZE_SX;

    saturn.ram = ( word_4* )NULL;
    if ( NULL == ( saturn.ram = ( word_4* )malloc( ram_size ) ) ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t malloc RAM[%d]\n", progname,
                     ram_size );
        exit( 1 );
    }

    strcpy( fnam, path );
    strcat( fnam, "ram" );
    if ( ( fp = fopen( fnam, "r" ) ) == NULL ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t open %s\n", progname, fnam );
        return 0;
    }
    if ( !read_mem_file( fnam, saturn.ram, ram_size ) )
        return 0;

    saturn.card_status = 0;

    port1_size = 0;
    port1_mask = 0;
    port1_is_ram = 0;
    saturn.port1 = ( unsigned char* )0;

    strcpy( fnam, path );
    strcat( fnam, "port1" );
    if ( stat( fnam, &st ) >= 0 ) {
        port1_size = 2 * st.st_size;
        if ( ( port1_size == 0x10000 ) || ( port1_size == 0x40000 ) ) {
            if ( NULL == ( saturn.port1 = ( word_4* )malloc( port1_size ) ) ) {
                if ( !quiet )
                    fprintf( stderr, "%s: can\'t malloc PORT1[%ld]\n", progname,
                             port1_size );
            } else if ( !read_mem_file( fnam, saturn.port1, port1_size ) ) {
                port1_size = 0;
                port1_is_ram = 0;
            } else {
                port1_is_ram = ( st.st_mode & S_IWUSR ) ? 1 : 0;
                port1_mask = port1_size - 1;
            }
        }
    }

    if ( opt_gx ) {
        saturn.card_status |= ( port1_size > 0 ) ? 2 : 0;
        saturn.card_status |= port1_is_ram ? 8 : 0;
    } else {
        saturn.card_status |= ( port1_size > 0 ) ? 1 : 0;
        saturn.card_status |= port1_is_ram ? 4 : 0;
    }

    port2_size = 0;
    port2_mask = 0;
    port2_is_ram = 0;
    saturn.port2 = ( unsigned char* )0;

    strcpy( fnam, path );
    strcat( fnam, "port2" );
    if ( stat( fnam, &st ) >= 0 ) {
        port2_size = 2 * st.st_size;
        if ( ( opt_gx && ( ( port2_size % 0x40000 ) == 0 ) ) ||
             ( !opt_gx &&
               ( ( port2_size == 0x10000 ) || ( port2_size == 0x40000 ) ) ) ) {
            if ( NULL == ( saturn.port2 = ( word_4* )malloc( port2_size ) ) ) {
                if ( !quiet )
                    fprintf( stderr, "%s: can\'t malloc PORT2[%ld]\n", progname,
                             port2_size );
            } else if ( !read_mem_file( fnam, saturn.port2, port2_size ) ) {
                port2_size = 0;
                port2_is_ram = 0;
            } else {
                port2_is_ram = ( st.st_mode & S_IWUSR ) ? 1 : 0;
                port2_mask = port2_size - 1;
            }
        }
    }

    if ( opt_gx ) {
        saturn.card_status |= ( port2_size > 0 ) ? 1 : 0;
        saturn.card_status |= port2_is_ram ? 4 : 0;
    } else {
        saturn.card_status |= ( port2_size > 0 ) ? 2 : 0;
        saturn.card_status |= port2_is_ram ? 8 : 0;
    }

    return 1;
}

int write_8( FILE* fp, word_8* var ) {
    unsigned char tmp;

    tmp = *var;
    if ( fwrite( &tmp, 1, 1, fp ) != 1 ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t write word_8\n", progname );
        return 0;
    }
    return 1;
}

int write_char( FILE* fp, char* var ) {
    char tmp;

    tmp = *var;
    if ( fwrite( &tmp, 1, 1, fp ) != 1 ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t write char\n", progname );
        return 0;
    }
    return 1;
}

int write_16( FILE* fp, word_16* var ) {
    unsigned char tmp[ 2 ];

    tmp[ 0 ] = ( *var >> 8 ) & 0xff;
    tmp[ 1 ] = *var & 0xff;
    if ( fwrite( &tmp[ 0 ], 1, 2, fp ) != 2 ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t write word_16\n", progname );
        return 0;
    }
    return 1;
}

int write_32( FILE* fp, word_32* var ) {
    unsigned char tmp[ 4 ];

    tmp[ 0 ] = ( *var >> 24 ) & 0xff;
    tmp[ 1 ] = ( *var >> 16 ) & 0xff;
    tmp[ 2 ] = ( *var >> 8 ) & 0xff;
    tmp[ 3 ] = *var & 0xff;
    if ( fwrite( &tmp[ 0 ], 1, 4, fp ) != 4 ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t write word_32\n", progname );
        return 0;
    }
    return 1;
}

int write_u_long( FILE* fp, unsigned long* var ) {
    unsigned char tmp[ 4 ];

    tmp[ 0 ] = ( *var >> 24 ) & 0xff;
    tmp[ 1 ] = ( *var >> 16 ) & 0xff;
    tmp[ 2 ] = ( *var >> 8 ) & 0xff;
    tmp[ 3 ] = *var & 0xff;
    if ( fwrite( &tmp[ 0 ], 1, 4, fp ) != 4 ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t write unsigned long\n", progname );
        return 0;
    }
    return 1;
}

int write_mem_file( char* name, word_4* mem, int size ) {
    FILE* fp;
    word_8* tmp_mem;
    word_8 byte;
    int i, j;

    if ( NULL == ( fp = fopen( name, "w" ) ) ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t open %s\n", progname, name );
        return 0;
    }

    if ( NULL == ( tmp_mem = ( word_8* )malloc( ( size_t )size / 2 ) ) ) {
        for ( i = 0, j = 0; i < size / 2; i++ ) {
            byte = ( mem[ j++ ] & 0x0f );
            byte |= ( mem[ j++ ] << 4 ) & 0xf0;
            if ( 1 != fwrite( &byte, 1, 1, fp ) ) {
                if ( !quiet )
                    fprintf( stderr, "%s: can\'t write %s\n", progname, name );
                fclose( fp );
                return 0;
            }
        }
    } else {
        for ( i = 0, j = 0; i < size / 2; i++ ) {
            tmp_mem[ i ] = ( mem[ j++ ] & 0x0f );
            tmp_mem[ i ] |= ( mem[ j++ ] << 4 ) & 0xf0;
        }

        if ( fwrite( tmp_mem, 1, ( size_t )size / 2, fp ) != size / 2 ) {
            if ( !quiet )
                fprintf( stderr, "%s: can\'t write %s\n", progname, name );
            fclose( fp );
            free( tmp_mem );
            return 0;
        }

        free( tmp_mem );
    }

    fclose( fp );

    if ( verbose )
        printf( "%s: wrote %s\n", progname, name );

    return 1;
}

int write_files( void ) {
    char path[ 1024 ];
    char fnam[ 1024 ];
    struct stat st;
    int i, make_dir;
    int ram_size;
    FILE* fp;

    make_dir = 0;
    get_home_directory( path );

    if ( stat( path, &st ) == -1 ) {
        if ( errno == ENOENT ) {
            make_dir = 1;
        } else {
            if ( !quiet )
                fprintf( stderr, "%s: can\'t stat %s, saving to /tmp\n",
                         progname, path );
            strcpy( path, "/tmp" );
        }
    } else {
        if ( !S_ISDIR( st.st_mode ) ) {
            if ( !quiet )
                fprintf( stderr, "%s: %s is no directory, saving to /tmp\n",
                         progname, path );
            strcpy( path, "/tmp" );
        }
    }

    if ( make_dir ) {
        if ( mkdir( path, 0777 ) == -1 ) {
            if ( !quiet )
                fprintf( stderr, "%s: can\'t mkdir %s, saving to /tmp\n",
                         progname, path );
            strcpy( path, "/tmp" );
        }
    }

    strcat( path, "/" );

    strcpy( fnam, path );
    strcat( fnam, "hp48" );
    if ( ( fp = fopen( fnam, "w" ) ) == NULL ) {
        if ( !quiet )
            fprintf( stderr, "%s: can\'t open %s, no saving done\n", progname,
                     fnam );
        return 0;
    }

    /*
     * write the hp48 config file
     */
    write_32( fp, ( word_32* )&saturn.magic );
    for ( i = 0; i < 4; i++ )
        write_char( fp, &saturn.version[ i ] );
    for ( i = 0; i < 16; i++ )
        write_8( fp, &saturn.A[ i ] );
    for ( i = 0; i < 16; i++ )
        write_8( fp, &saturn.B[ i ] );
    for ( i = 0; i < 16; i++ )
        write_8( fp, &saturn.C[ i ] );
    for ( i = 0; i < 16; i++ )
        write_8( fp, &saturn.D[ i ] );
    write_32( fp, &saturn.d[ 0 ] );
    write_32( fp, &saturn.d[ 1 ] );
    write_8( fp, &saturn.P );
    write_32( fp, &saturn.PC );
    for ( i = 0; i < 16; i++ )
        write_8( fp, &saturn.R0[ i ] );
    for ( i = 0; i < 16; i++ )
        write_8( fp, &saturn.R1[ i ] );
    for ( i = 0; i < 16; i++ )
        write_8( fp, &saturn.R2[ i ] );
    for ( i = 0; i < 16; i++ )
        write_8( fp, &saturn.R3[ i ] );
    for ( i = 0; i < 16; i++ )
        write_8( fp, &saturn.R4[ i ] );
    for ( i = 0; i < 4; i++ )
        write_8( fp, &saturn.IN[ i ] );
    for ( i = 0; i < 3; i++ )
        write_8( fp, &saturn.OUT[ i ] );
    write_8( fp, &saturn.CARRY );
    for ( i = 0; i < NR_PSTAT; i++ )
        write_8( fp, &saturn.PSTAT[ i ] );
    write_8( fp, &saturn.XM );
    write_8( fp, &saturn.SB );
    write_8( fp, &saturn.SR );
    write_8( fp, &saturn.MP );
    write_8( fp, &saturn.hexmode );
    for ( i = 0; i < NR_RSTK; i++ )
        write_32( fp, &saturn.rstk[ i ] );
    write_16( fp, ( word_16* )&saturn.rstkp );
    for ( i = 0; i < 9; i++ )
        write_16( fp, ( word_16* )&saturn.keybuf.rows[ i ] );
    write_8( fp, &saturn.intenable );
    write_8( fp, &saturn.int_pending );
    write_8( fp, &saturn.kbd_ien );
    write_8( fp, &saturn.disp_io );
    write_8( fp, &saturn.contrast_ctrl );
    write_8( fp, &saturn.disp_test );
    write_16( fp, &saturn.crc );
    write_8( fp, &saturn.power_status );
    write_8( fp, &saturn.power_ctrl );
    write_8( fp, &saturn.mode );
    write_8( fp, &saturn.annunc );
    write_8( fp, &saturn.baud );
    write_8( fp, &saturn.card_ctrl );
    write_8( fp, &saturn.card_status );
    write_8( fp, &saturn.io_ctrl );
    write_8( fp, &saturn.rcs );
    write_8( fp, &saturn.tcs );
    write_8( fp, &saturn.rbr );
    write_8( fp, &saturn.tbr );
    write_8( fp, &saturn.sreq );
    write_8( fp, &saturn.ir_ctrl );
    write_8( fp, &saturn.base_off );
    write_8( fp, &saturn.lcr );
    write_8( fp, &saturn.lbr );
    write_8( fp, &saturn.scratch );
    write_8( fp, &saturn.base_nibble );
    write_32( fp, &saturn.disp_addr );
    write_16( fp, &saturn.line_offset );
    write_8( fp, &saturn.line_count );
    write_16( fp, &saturn.unknown );
    write_8( fp, &saturn.t1_ctrl );
    write_8( fp, &saturn.t2_ctrl );
    write_32( fp, &saturn.menu_addr );
    write_8( fp, &saturn.unknown2 );
    write_char( fp, &saturn.timer1 );
    write_32( fp, &saturn.timer2 );
    write_32( fp, &saturn.t1_instr );
    write_32( fp, &saturn.t2_instr );
    write_16( fp, ( word_16* )&saturn.t1_tick );
    write_16( fp, ( word_16* )&saturn.t2_tick );
    write_32( fp, &saturn.i_per_s );
    write_16( fp, &saturn.bank_switch );
    for ( i = 0; i < NR_MCTL; i++ ) {
        write_16( fp, &saturn.mem_cntl[ i ].unconfigured );
        write_32( fp, &saturn.mem_cntl[ i ].config[ 0 ] );
        write_32( fp, &saturn.mem_cntl[ i ].config[ 1 ] );
    }
    fclose( fp );
    if ( verbose )
        printf( "%s: wrote %s\n", progname, fnam );

    if ( rom_is_new ) {
        strcpy( fnam, path );
        strcat( fnam, "rom" );
        if ( !write_mem_file( fnam, saturn.rom, rom_size ) )
            return 0;
    }

    if ( opt_gx )
        ram_size = RAM_SIZE_GX;
    else
        ram_size = RAM_SIZE_SX;

    strcpy( fnam, path );
    strcat( fnam, "ram" );
    if ( !write_mem_file( fnam, saturn.ram, ram_size ) )
        return 0;

    if ( ( port1_size > 0 ) && port1_is_ram ) {
        strcpy( fnam, path );
        strcat( fnam, "port1" );
        if ( !write_mem_file( fnam, saturn.port1, port1_size ) )
            return 0;
    }

    if ( ( port2_size > 0 ) && port2_is_ram ) {
        strcpy( fnam, path );
        strcat( fnam, "port2" );
        if ( !write_mem_file( fnam, saturn.port2, port2_size ) )
            return 0;
    }

    return 1;
}

int init_emulator( void ) {
    if ( !initialize )
        if ( read_files() ) {
            if ( resetOnStartup )
                saturn.PC = 0x00000;
            return 0;
        }

    init_saturn();
    if ( !read_rom( romFileName ) )
        exit( 1 );

    return 0;
}

void init_active_stuff( void ) {
    serial_init();
    init_annunc();
    init_display();
}

int exit_emulator( void ) {
    write_files();
    return 1;
}