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Changed registers used for EGA/VGA odd/even mode.

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This commit is contained in:
TomW 2015-08-14 21:54:42 +01:00
commit 3789398ca6
4 changed files with 16 additions and 9 deletions
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9
src/vid_ega.c
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@ -77,6 +77,9 @@ void ega_out(uint16_t addr, uint8_t val, void *p)
ega->charsetb = (((val >> 2) & 3) * 0x10000) + 2;
ega->charseta = ((val & 3) * 0x10000) + 2;
break;
case 4:
ega->chain2_write = !(val & 4);
break;
}
break;
case 0x3ce:
@ -95,10 +98,10 @@ void ega_out(uint16_t addr, uint8_t val, void *p)
case 5:
ega->writemode = val & 3;
ega->readmode = val & 8;
ega->chain2_read = val & 0x10;
break;
case 6:
// pclog("Write mapping %02X\n", val);
ega->chain2 = val & 2;
switch (val & 0xc)
{
case 0x0: /*128k at A0000*/
@ -622,7 +625,7 @@ void ega_write(uint32_t addr, uint8_t val, void *p)
if (addr >= 0xB0000) addr &= 0x7fff;
else addr &= 0xffff;
if (ega->chain2)
if (ega->chain2_write)
{
writemask2 &= ~0xa;
if (addr & 1)
@ -755,7 +758,7 @@ uint8_t ega_read(uint32_t addr, void *p)
if (addr >= 0xb0000) addr &= 0x7fff;
else addr &= 0xffff;
if (ega->chain2)
if (ega->chain2_read)
{
readplane = (readplane & 2) | (addr & 1);
addr &= ~1;