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gen: fix Flavio's DMA test rom. and hopefully something else too.

This commit is contained in:
beirich 2012-09-03 22:26:33 +00:00
parent a48562bc36
commit 0a60a37705
1 changed files with 4 additions and 3 deletions
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7
BizHawk.Emulation/Consoles/Sega/Genesis/GenVDP.cs
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@ -133,7 +133,7 @@ namespace BizHawk.Emulation.Consoles.Sega
//Console.WriteLine("Address = {0:X4}", VdpDataAddr);
VdpDataCode &= 0x03;
VdpDataCode |= (byte) ((data >> 2) & 0x3C);
//Console.WriteLine("Code = {0:X2}", VdpDataCode);
//Log.Note("VDP", "Code = {0:X2}", VdpDataCode);
if ((VdpDataCode & 0x20) != 0 && DmaEnabled) // DMA triggered
{
@ -161,6 +161,7 @@ namespace BizHawk.Emulation.Consoles.Sega
public ushort ReadVdpControl()
{
VdpStatusWord |= 0x0200; // Fifo empty // TODO kill this, emulating the damn FIFO.
ControlWordPending = false; // Hmm.. if this happens in an interrupt between 1st and 2nd word..
// sprite overflow flag should clear.
// sprite collision flag should clear.
@ -180,7 +181,7 @@ namespace BizHawk.Emulation.Consoles.Sega
Log.Error("VDP", "VRAM byte-swap is happening because A0 is not 0");
}
switch (VdpDataCode & 7)
switch (VdpDataCode & 0xF)
{
case CommandVramWrite: // VRAM Write
VRAM[VdpDataAddr & 0xFFFE] = (byte) data;
@ -219,7 +220,7 @@ namespace BizHawk.Emulation.Consoles.Sega
{
int orig_addr = VdpDataAddr;
ushort retval = 0xBEEF;
switch (VdpDataCode & 7)
switch (VdpDataCode & 0x0F)
{
case CommandVramRead:
//if ((VdpDataAddr & 1) != 0) throw new Exception("VRAM read is not word-aligned. what do?");