claunia/86Box
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Fixed EGA and CL-GD542x odd/even mode;

Browse Source 
(S)VGA linear write no longer has planar access or ALU things, both of which don't even make sense at linear write.
This commit is contained in:
OBattler
2016-07-19 03:02:11 +02:00
parent b78b2fecaa
commit fdaea1f11b
3 changed files with 32 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

27
src/vid_ega.c
View File

@@ -724,11 +724,18 @@ void ega_write(uint32_t addr, uint8_t val, void *p)
if (ega->chain2_write)
{
plane = (addr & 1) | (ega->oddeven_page ? 2 : 0);
/* Redone because the original code caused problems when using Windows 3.1 EGA driver on (S)VGA card. */
if (ega->oddeven_chain)
plane = (addr & 1) | (ega->oddeven_page ? 2 : 0);
else
plane = (ega->oddeven_page ? 2 : 0);
mask = (1 << plane);
if (ega->seqregs[2] & mask)
{
addr = (((addr & ~1) | ega->oddeven_chain) << 2) | plane;
if (ega->oddeven_chain)
addr = ((addr & ~1) << 2) | plane;
else
addr = (addr << 2) | plane;
if ((!ega->extvram) && (addr >= 0x10000)) return;
if (addr >= 0x40000) return;
if ((raddr <= 0xA0000) || (raddr >= 0xBFFFF)) return;
@@ -863,10 +870,20 @@ uint8_t ega_read(uint32_t addr, void *p)
if (addr >= 0xb0000) addr &= 0x7fff;
else addr &= 0xffff;
if (ega->chain2_read)
if (svga->chain2_read)
{
plane = (addr & 1) | (ega->oddeven_page ? 2 : 0);
addr = (((addr & ~1) | ega->oddeven_chain) << 2) | plane;
/* Redone because the original code caused problems when using Windows 3.1 EGA driver on (S)VGA card. */
if (ega->oddeven_chain)
{
plane = (addr & 1) | (ega->oddeven_page ? 2 : 0);
addr = ((addr & ~1) << 2) | plane;
}
else
{
plane = (ega->oddeven_page ? 2 : 0);
addr = (addr << 2) | plane;
}
if ((!ega->extvram) && (addr >= 0x10000)) return 0xff;
if (addr >= 0x40000) return 0xff;
return ega->vram[addr];