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sanyo/mbc200.cpp: Handle boot ROM overlay properly.

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This commit is contained in:
Vas Crabb 2023-04-20 05:29:19 +10:00
parent d26645c531
commit 7ba0d09fb2
1 changed files with 77 additions and 55 deletions
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132
src/mame/sanyo/mbc200.cpp
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@ -12,7 +12,7 @@ Machine MBC-1200 is identical but sold outside of Japan
Floppy = 5.25"
MBC1200 has one floppy while MBC1250 has 2. The systems are otherwise identical.
Keyboard communicates via RS232 to uart at E0,E1. The processor and rom for it
Keyboard communicates via RS232 to UART at E0,E1. The processor and ROM for it
are undumped / unknown. The input codes are not ascii, so using custom code until
the required details become available.
@ -34,14 +34,6 @@ TODO:
- UART connections
- Any other devices?
2011-10-31 Skeleton driver.
2014-05-18 Made rom get copied into ram, boot code from disk
requires that ram is there otherwise you get
a MEMORY ERROR. CP/M now loads.
2016-07-16 Added keyboard and sound.
2023-04-13 Floppy drive selection fix
****************************************************************************/
#include "emu.h"
@ -68,6 +60,7 @@ class mbc200_state : public driver_device
public:
mbc200_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag)
, m_boot_view(*this, "boot")
, m_palette(*this, "palette")
, m_crtc(*this, "crtc")
, m_ppi_m(*this, "ppi_m")
@ -80,13 +73,14 @@ public:
, m_floppy(*this, "fdc:%u", 0)
{ }
void mbc200(machine_config &config);
void mbc200(machine_config &config) ATTR_COLD;
protected:
virtual void machine_start() override;
virtual void machine_reset() override;
virtual void machine_start() override ATTR_COLD;
virtual void machine_reset() override ATTR_COLD;
private:
u8 boot_m1_r(offs_t offset);
u8 p2_porta_r();
void p1_portc_w(u8 data);
void pm_porta_w(u8 data);
@ -94,17 +88,15 @@ private:
u8 keyboard_r(offs_t offset);
void kbd_put(u8 data);
MC6845_UPDATE_ROW(update_row);
void main_mem(address_map &map) ATTR_COLD;
void main_io(address_map &map) ATTR_COLD;
void main_opcodes(address_map &map) ATTR_COLD;
void sub_mem(address_map &map) ATTR_COLD;
void sub_io(address_map &map) ATTR_COLD;
memory_view m_boot_view;
required_device<palette_device> m_palette;
void main_mem(address_map &map);
void main_io(address_map &map);
void sub_mem(address_map &map);
void sub_io(address_map &map);
u8 m_cpu_m_sound = 0U;
u8 m_cpu_s_sound = 0U;
u8 m_comm_latch = 0U;
u8 m_term_data = 0U;
required_device<mc6845_device> m_crtc;
required_device<i8255_device> m_ppi_m;
required_shared_ptr<u8> m_vram;
@ -114,14 +106,71 @@ private:
required_device<speaker_sound_device> m_speaker;
required_device<mb8876_device> m_fdc;
required_device_array<floppy_connector, 4> m_floppy;
u8 m_cpu_m_sound = 0U;
u8 m_cpu_s_sound = 0U;
u8 m_comm_latch = 0U;
u8 m_term_data = 0U;
};
void mbc200_state::main_mem(address_map &map)
{
map(0x0000, 0xffff).ram().share("mainram");
map(0x0000, 0xffff).ram().share(m_ram);
map(0x0000, 0x7fff).view(m_boot_view);
m_boot_view[0](0x0000, 0x0fff).mirror(0x7000).rom().region("maincpu", 0).unmapw();
}
void mbc200_state::main_opcodes(address_map &map)
{
// set up on reset
}
void mbc200_state::main_io(address_map &map)
{
map.unmap_value_high();
map.global_mask(0xff);
//map(0xe0, 0xe1).rw("uart1", FUNC(i8251_device::read), FUNC(i8251_device::write));
map(0xe0, 0xe1).r(FUNC(mbc200_state::keyboard_r)).nopw();
map(0xe4, 0xe7).rw(m_fdc, FUNC(mb8876_device::read), FUNC(mb8876_device::write));
map(0xe8, 0xeb).rw(m_ppi_m, FUNC(i8255_device::read), FUNC(i8255_device::write));
map(0xec, 0xed).rw("uart2", FUNC(i8251_device::read), FUNC(i8251_device::write));
}
void mbc200_state::sub_mem(address_map &map)
{
map.unmap_value_high();
map(0x0000, 0x1fff).rom();
map(0x2000, 0x7fff).ram();
map(0x8000, 0xffff).ram().share("vram");
}
void mbc200_state::sub_io(address_map &map)
{
map.unmap_value_high();
map.global_mask(0xff);
map(0x70, 0x73).rw("ppi_1", FUNC(i8255_device::read), FUNC(i8255_device::write));
map(0xb0, 0xb0).rw(m_crtc, FUNC(mc6845_device::status_r), FUNC(mc6845_device::address_w));
map(0xb1, 0xb1).rw(m_crtc, FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w));
map(0xd0, 0xd3).rw("ppi_2", FUNC(i8255_device::read), FUNC(i8255_device::write));
}
u8 mbc200_state::boot_m1_r(offs_t offset)
{
if (!machine().side_effects_disabled())
{
m_boot_view.disable();
m_maincpu->space(AS_OPCODES).install_rom(0x0000, 0xffff, &m_ram[0]);
}
return m_ram[0x8000 | offset];
}
void mbc200_state::p1_portc_w(u8 data)
{
m_cpu_s_sound = BIT(data, 4); // used by beep command in basic
@ -156,26 +205,6 @@ void mbc200_state::pm_portb_w(u8 data)
m_speaker->level_w(m_cpu_m_sound + m_cpu_s_sound);
}
void mbc200_state::main_io(address_map &map)
{
map.unmap_value_high();
map.global_mask(0xff);
//map(0xe0, 0xe1).rw("uart1", FUNC(i8251_device::read), FUNC(i8251_device::write));
map(0xe0, 0xe1).r(FUNC(mbc200_state::keyboard_r)).nopw();
map(0xe4, 0xe7).rw(m_fdc, FUNC(mb8876_device::read), FUNC(mb8876_device::write));
map(0xe8, 0xeb).rw(m_ppi_m, FUNC(i8255_device::read), FUNC(i8255_device::write));
map(0xec, 0xed).rw("uart2", FUNC(i8251_device::read), FUNC(i8251_device::write));
}
void mbc200_state::sub_mem(address_map &map)
{
map.unmap_value_high();
map(0x0000, 0x1fff).rom();
map(0x2000, 0x7fff).ram();
map(0x8000, 0xffff).ram().share("vram");
}
u8 mbc200_state::p2_porta_r()
{
@ -186,16 +215,6 @@ u8 mbc200_state::p2_porta_r()
return tmp;
}
void mbc200_state::sub_io(address_map &map)
{
map.unmap_value_high();
map.global_mask(0xff);
map(0x70, 0x73).rw("ppi_1", FUNC(i8255_device::read), FUNC(i8255_device::write));
map(0xb0, 0xb0).rw(m_crtc, FUNC(mc6845_device::status_r), FUNC(mc6845_device::address_w));
map(0xb1, 0xb1).rw(m_crtc, FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w));
map(0xd0, 0xd3).rw("ppi_2", FUNC(i8255_device::read), FUNC(i8255_device::write));
}
/* Input ports */
static INPUT_PORTS_START( mbc200 )
INPUT_PORTS_END
@ -266,7 +285,9 @@ void mbc200_state::machine_start()
void mbc200_state::machine_reset()
{
memcpy(m_ram, m_rom, 0x1000);
m_boot_view.select(0);
m_maincpu->space(AS_OPCODES).install_rom(0x0000, 0x0fff, 0x7000, &m_rom[0]);
m_maincpu->space(AS_OPCODES).install_read_handler(0x8000, 0xffff, emu::rw_delegate(*this, FUNC(mbc200_state::boot_m1_r)));
}
static void mbc200_floppies(device_slot_interface &device)
@ -316,6 +337,7 @@ void mbc200_state::mbc200(machine_config &config)
Z80(config, m_maincpu, 8_MHz_XTAL / 2); // NEC D780C-1
m_maincpu->set_addrmap(AS_PROGRAM, &mbc200_state::main_mem);
m_maincpu->set_addrmap(AS_IO, &mbc200_state::main_io);
m_maincpu->set_addrmap(AS_OPCODES, &mbc200_state::main_opcodes);
z80_device &subcpu(Z80(config, "subcpu", 8_MHz_XTAL / 2)); // NEC D780C-1
subcpu.set_addrmap(AS_PROGRAM, &mbc200_state::sub_mem);
@ -374,7 +396,7 @@ ROM_START( mbc200 )
ROM_REGION( 0x1000, "maincpu", 0 )
ROM_LOAD( "d2732a.bin", 0x0000, 0x1000, CRC(bf364ce8) SHA1(baa3a20a5b01745a390ef16628dc18f8d682d63b))
ROM_REGION( 0x3000, "subcpu", ROMREGION_ERASEFF )
ROM_REGION( 0x2000, "subcpu", ROMREGION_ERASEFF )
ROM_LOAD( "m5l2764.bin", 0x0000, 0x2000, CRC(377300a2) SHA1(8563172f9e7f84330378a8d179f4138be5fda099))
ROM_END