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Improved ET4000 CRTC emulation, Windows NT no longer misdetects ET4000/W32 or hangs.

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This commit is contained in:
TomW 2014-07-28 20:32:56 +01:00
commit ff56f01516
1 changed files with 14 additions and 1 deletions
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15
src/vid_et4000.c
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@ -21,6 +21,18 @@ typedef struct et4000_t
uint8_t banking; uint8_t banking;
} et4000_t; } et4000_t;
static uint8_t crtc_mask[0x40] =
{
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xff, 0xff, 0x0f, 0xff, 0xff, 0xff, 0xff,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
void et4000_out(uint16_t addr, uint8_t val, void *p) void et4000_out(uint16_t addr, uint8_t val, void *p)
{ {
et4000_t *et4000 = (et4000_t *)p; et4000_t *et4000 = (et4000_t *)p;
@ -32,7 +44,7 @@ void et4000_out(uint16_t addr, uint8_t val, void *p)
addr ^= 0x60; addr ^= 0x60;
// pclog("ET4000 out %04X %02X\n", addr, val); // pclog("ET4000 out %04X %02X\n", addr, val);
switch (addr) switch (addr)
{ {
case 0x3C6: case 0x3C7: case 0x3C8: case 0x3C9: case 0x3C6: case 0x3C7: case 0x3C8: case 0x3C9:
@ -51,6 +63,7 @@ void et4000_out(uint16_t addr, uint8_t val, void *p)
case 0x3D5: case 0x3D5:
if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) return; if (svga->crtcreg <= 7 && svga->crtc[0x11] & 0x80) return;
old = svga->crtc[svga->crtcreg]; old = svga->crtc[svga->crtcreg];
val &= crtc_mask[svga->crtcreg];
svga->crtc[svga->crtcreg] = val; svga->crtc[svga->crtcreg] = val;
if (old != val) if (old != val)
{ {