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Add the OTI068 clocks to the OTI OAK chips.

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1. This fixes wrong refresh rates of the Oak VGA chips.
2. VGA mode bit 7 (oak reg 0x0e) when in text mode should clear the banking if so desired (assuming VGA mode means non-extended modes).
This commit is contained in:
TC1995
2026-03-03 18:56:59 +01:00
parent 3cf06f09d4
commit f41c590187
1 changed files with 32 additions and 9 deletions
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41
src/video/vid_oak_oti.c
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@@ -203,6 +203,10 @@ oti_out(uint16_t addr, uint8_t val, void *priv)
}
break;
case 0x0e:
svga_recalctimings(svga);
break;
case 0x11:
svga->read_bank = (val & 0xf) * 65536;
svga->write_bank = (val >> 4) * 65536;
@@ -377,7 +381,7 @@ oti_pos_in(UNUSED(uint16_t addr), void *priv)
}
static float
oti_getclock(int clock)
oti068_getclock(int clock)
{
float ret = 0.0;
@@ -389,14 +393,23 @@ oti_getclock(int clock)
case 1:
ret = 28322000.0;
break;
case 2:
ret = 65000000.0;
break;
case 3:
ret = 44900000.0;
break;
case 4:
ret = 14318000.0;
ret = 28322000.0;
break;
case 5:
ret = 16257000.0;
ret = 36000000.0;
break;
case 6:
ret = 40000000.0;
break;
case 7:
ret = 35500000.0;
ret = 36000000.0;
break;
}
@@ -409,7 +422,7 @@ oti_recalctimings(svga_t *svga)
const oti_t *oti = (oti_t *) svga->priv;
int clk_sel = ((svga->miscout >> 2) & 3) | ((oti->regs[0x0d] & 0x20) >> 3);
svga->clock = (cpuclock * (double) (1ULL << 32)) / oti_getclock(clk_sel);
svga->clock = (cpuclock * (double) (1ULL << 32)) / oti068_getclock(clk_sel);
if (oti->chip_id > 0) {
if (oti->regs[0x14] & 0x08)
@@ -424,7 +437,17 @@ oti_recalctimings(svga_t *svga)
if (oti->regs[0x14] & 0x04)
svga->vsyncstart += 0x400;
svga->interlace = oti->regs[0x14] & 0x80;
svga->interlace = !!(oti->regs[0x14] & 0x80);
if (!svga->scrblank && svga->attr_palette_enable) {
if (!(svga->gdcreg[6] & 1) && !(svga->attrregs[0x10] & 1))
svga->interlace = 0;
}
if (oti->regs[0x0e] & 0x80) {
svga->write_bank = 0;
svga->read_bank = 0;
}
}
if ((oti->regs[0x0d] & 0x0c) && !(oti->regs[0x0d] & 0x10))
@@ -519,10 +542,10 @@ oti_init(const device_t *info)
if (oti->chip_id == OTI_077_ACER100T) {
/*
josephillips: Required to show all BIOS
josephillips: Required to show all BIOS
information on Acer 100T only
*/
video_inform(0x1, &timing_oti);
video_inform(0x1, &timing_oti);
} else
video_inform(VIDEO_FLAG_TYPE_SPECIAL, &timing_oti);
@@ -538,7 +561,7 @@ oti_init(const device_t *info)
oti->svga.miscout = 1;
oti->svga.packed_chain4 = 1;
return oti;
}