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(MESS) svga_s3: added extra extended start address and banking registers (no whatsnew)

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mahlemiut 2012-09-24 13:15:50 +00:00
parent c0af92efed
commit cc659dcabd
1 changed files with 15 additions and 2 deletions
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17
src/emu/video/pc_vga.c
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@ -2755,12 +2755,18 @@ static UINT8 s3_crtc_reg_read(running_machine &machine, UINT8 index)
case 0x4f:
res = s3.cursor_pattern_y;
break;
case 0x51:
res = (vga.crtc.start_addr & 0x0c0000) >> 18;
break;
case 0x55:
res = s3.extended_dac_ctrl;
break;
case 0x67:
res = s3.ext_misc_ctrl_2;
break;
case 0x69:
res = vga.crtc.start_addr >> 16;
break;
case 0x6a:
res = svga.bank_r & 0x7f;
break;
@ -2964,6 +2970,9 @@ bit 0-5 Pattern Display Start Y-Pixel Position.
case 0x51:
vga.crtc.start_addr &= ~0xc0000;
vga.crtc.start_addr |= ((data & 0x3) << 18);
svga.bank_w = (svga.bank_w & 0xcf) | ((data & 0x0c) << 2);
svga.bank_r = svga.bank_r;
s3_define_video_mode();
break;
case 0x53:
s3.cr53 = data;
@ -2996,10 +3005,14 @@ bit 0-1 DAC Register Select Bits. Passed to the RS2 and RS3 pins on the
s3.ext_misc_ctrl_2 = data;
s3_define_video_mode();
//printf("%02x X\n",data);
//debugger_break(machine);
break;
case 0x69:
vga.crtc.start_addr &= ~0x1f0000;
vga.crtc.start_addr |= ((data & 0x1f) << 16);
s3_define_video_mode();
break;
case 0x6a:
svga.bank_w = data & 0xf;
svga.bank_w = data & 0x3f;
svga.bank_r = svga.bank_w;
if(data & 0x60)
fatalerror("TODO: s3 bank selects above 1M\n");