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TomW 2013-05-27 19:56:33 +01:00
commit f822488656
89 changed files with 18428 additions and 6383 deletions
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src/vid_ati68860_ramdac.c Normal file
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/*ATI 68860 RAMDAC emulation (for Mach64)*/
/*
ATI 68860/68880 Truecolor DACs:
REG08 (R/W):
bit 0-? Always 2 ??
REG0A (R/W):
bit 0-? Always 1Dh ??
REG0B (R/W): (GMR ?)
bit 0-7 Mode. 82h: 4bpp, 83h: 8bpp, A0h: 15bpp, A1h: 16bpp, C0h: 24bpp,
E3h: 32bpp (80h for VGA modes ?)
REG0C (R/W): Device Setup Register A
bit 0 Controls 6/8bit DAC. 0: 8bit DAC/LUT, 1: 6bit DAC/LUT
2-3 Depends on Video memory (= VRAM width ?) . 1: Less than 1Mb, 2: 1Mb,
3: > 1Mb
5-6 Always set ?
7 If set can remove "snow" in some cases (A860_Delay_L ?) ??
*/
#include "ibm.h"
#include "video.h"
#include "vid_svga.h"
#include "vid_ati68860_ramdac.h"
static uint8_t ramdac_regs[16];
void ati68860_ramdac_out(uint16_t addr, uint8_t val, void *priv)
{
// pclog("ati68860_out : addr %04X val %02X %04X:%04X\n", addr, val, CS,pc);
switch (addr)
{
case 0:
svga_out(0x3c8, val, NULL);
break;
case 1:
svga_out(0x3c9, val, NULL);
break;
case 2:
svga_out(0x3c6, val, NULL);
break;
case 3:
svga_out(0x3c7, val, NULL);
break;
default:
ramdac_regs[addr & 0xf] = val;
break;
}
}
uint8_t ati68860_ramdac_in(uint16_t addr, void *priv)
{
uint8_t ret = 0;
switch (addr)
{
case 0:
ret = svga_in(0x3c8, NULL);
break;
case 1:
ret = svga_in(0x3c9, NULL);
break;
case 2:
ret = svga_in(0x3c6, NULL);
break;
case 3:
ret = svga_in(0x3c7, NULL);
break;
case 4: case 8:
ret = 2;
break;
case 6: case 0xa:
ret = 0x1d;
break;
case 0xf:
ret = 0xd0;
break;
default:
ret = ramdac_regs[addr & 0xf];
break;
}
// pclog("ati68860_in : addr %04X ret %02X %04X:%04X\n", addr, ret, CS,pc);
return ret;
}