80486DX2-66/86Box-fork
1
0
Fork 0
Code Issues Pull Requests Activity

MAJOR ATI 18800 improvements

Browse Source
This commit is contained in:
Melissa Goad
2017-01-06 09:02:53 -06:00
parent 91939ac23b
commit cb4db2fada
1 changed files with 36 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

40
src/vid_ati18800.c
View File

@@ -1,4 +1,4 @@
/* Copyright holders: Sarah Walker /* Copyright holders: Sarah Walker, Melissa Goad
see COPYING for more details see COPYING for more details
*/ */
/*ATI 18800 emulation (VGA Edge-16)*/ /*ATI 18800 emulation (VGA Edge-16)*/
@@ -32,7 +32,8 @@ void ati18800_out(uint16_t addr, uint8_t val, void *p)
// pclog("ati18800_out : %04X %02X %04X:%04X\n", addr, val, CS,cpu_state.pc); // pclog("ati18800_out : %04X %02X %04X:%04X\n", addr, val, CS,cpu_state.pc);
if (((addr&0xFFF0) == 0x3D0 || (addr&0xFFF0) == 0x3B0) && !(svga->miscout&1)) addr ^= 0x60; if (((addr & 0xfff0) == 0x3d0 || (addr & 0xfff0) == 0x3b0) && !(svga->miscout & 1))
addr ^= 0x60;
switch (addr) switch (addr)
{ {
@@ -41,8 +42,11 @@ void ati18800_out(uint16_t addr, uint8_t val, void *p)
break; break;
case 0x1cf: case 0x1cf:
ati18800->regs[ati18800->index] = val; ati18800->regs[ati18800->index] = val;
pclog("ATI 18800 ATI register write %02x %02x\n", ati18800->index, val);
switch (ati18800->index) switch (ati18800->index)
{ {
case 0xb0:
svga_recalctimings(svga);
case 0xb2: case 0xb2:
case 0xbe: case 0xbe:
if (ati18800->regs[0xbe] & 8) /*Read/write bank mode*/ if (ati18800->regs[0xbe] & 8) /*Read/write bank mode*/
@@ -65,10 +69,22 @@ void ati18800_out(uint16_t addr, uint8_t val, void *p)
case 0x3D5: case 0x3D5:
if (svga->crtcreg <= 0x18) if (svga->crtcreg <= 0x18)
val &= mask_crtc[svga->crtcreg]; val &= mask_crtc[svga->crtcreg];
if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80)) if ((svga->crtcreg < 7) && (svga->crtc[0x11] & 0x80) && !(ati18800->regs[0xb4] & 0x80))
return; return;
if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80)) if ((svga->crtcreg == 7) && (svga->crtc[0x11] & 0x80) && !(ati18800->regs[0xb4] & 0x80))
val = (svga->crtc[7] & ~0x10) | (val & 0x10); val = (svga->crtc[7] & ~0x10) | (val & 0x10);
if ((ati18800->regs[0xb4] & 4) && (svga->crtcreg == 9))
val = (svga->crtc[9] & ~0x60) | (val & 0x60);
if ((ati18800->regs[0xb4] & 8) && ((svga->crtcreg == 6) || (svga->crtcreg == 0x10) || (svga->crtcreg == 0x12) || (svga->crtcreg == 0x15) || (svga->crtcreg == 0x16)))
return;
if ((ati18800->regs[0xb4] & 8) && (svga->crtcreg == 7))
val = (svga->crtc[9] & ~0x10) | (val & 0x10);
if ((ati18800->regs[0xb4] & 8) && (svga->crtcreg == 9))
val = (svga->crtc[9] & ~0xdf) | (val & 0xdf);
if ((ati18800->regs[0xb4] & 8) && (svga->crtcreg == 0x11))
val = (svga->crtc[9] & ~0xf0) | (val & 0xf0);
if ((ati18800->regs[0xb4] & 0x10) && ((svga->crtcreg == 0x0a) || (svga->crtcreg == 0x0b)))
return;
old = svga->crtc[svga->crtcreg]; old = svga->crtc[svga->crtcreg];
svga->crtc[svga->crtcreg] = val; svga->crtc[svga->crtcreg] = val;
if (old != val) if (old != val)
@@ -130,6 +146,22 @@ uint8_t ati18800_in(uint16_t addr, void *p)
return temp; return temp;
} }
void ati18800_recalctimings(svga_t *svga)
{
ati18800_t *ati18800 = (ati18800_t *)svga->p;
svga->ma_latch += (ati18800->regs[0xb0] & 0xc0) << 10;
if(ati18800->regs[0xb1] & 0x40)
{
svga->vtotal >>= 1;
svga->dispend >>= 1;
svga->vsyncstart >>= 1;
svga->split >>= 1;
svga->vblankstart >>= 1;
}
}
void *ati18800_init() void *ati18800_init()
{ {
ati18800_t *ati18800 = malloc(sizeof(ati18800_t)); ati18800_t *ati18800 = malloc(sizeof(ati18800_t));