ShuriZma
/
BizHawk
mirror of https://github.com/TASEmulators/BizHawk.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

SMS: implement VDP/PSG IO port mirroring. passes some additional VDP tests

This commit is contained in:
beirich 2014-03-17 03:56:42 +00:00
parent 8b844bff34
commit eeeb71dfe0
1 changed files with 54 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
BizHawk.Emulation.Cores/Consoles/Sega/SMS/SMS.cs
View File

@ -205,7 +205,10 @@ namespace BizHawk.Emulation.Cores.Sega.MasterSystem
public byte ReadPort(ushort port)
{
switch (port & 0xFF)
port &= 0xFF;
if (port < 0x40) // General IO ports
{
switch (port)
{
case 0x00: return ReadPort0();
case 0x01: return Port01;
@ -215,20 +218,38 @@ namespace BizHawk.Emulation.Cores.Sega.MasterSystem
case 0x05: return 0x00;
case 0x06: return 0xFF;
case 0x3E: return Port3E;
case 0x7E: return Vdp.ReadVLineCounter();
case 0x7F: break; // hline counter TODO
case 0xBE: return Vdp.ReadData();
case 0xBF: return Vdp.ReadVdpStatus();
default: return 0xFF;
}
}
if (port < 0x80) // VDP Vcounter/HCounter
{
if ((port & 1) == 0)
return Vdp.ReadVLineCounter();
else
return 0x50; // TODO Vdp.ReadHLineCounter();
}
if (port < 0xC0) // VDP data/control ports
{
if ((port & 1) == 0)
return Vdp.ReadData();
else
return Vdp.ReadVdpStatus();
}
switch (port)
{
case 0xC0:
case 0xDC: return ReadControls1();
case 0xC1:
case 0xDD: return ReadControls2();
case 0xF2: return HasYM2413 ? YM2413.DetectionValue : (byte)0xFF;
default: return 0xFF;
}
return 0xFF;
}
public void WritePort(ushort port, byte value)
{
port &= 0xFF;
if (port < 0x40) // general IO ports
{
switch (port & 0xFF)
{
@ -237,16 +258,21 @@ namespace BizHawk.Emulation.Cores.Sega.MasterSystem
case 0x06: PSG.StereoPanning = value; break;
case 0x3E: Port3E = value; break;
case 0x3F: Port3F = value; break;
case 0x7E:
case 0x7F: PSG.WritePsgData(value, Cpu.TotalExecutedCycles); break;
case 0xBE: Vdp.WriteVdpData(value); break;
case 0xBD:
case 0xBF: Vdp.WriteVdpControl(value); break;
case 0xF0: if (HasYM2413) YM2413.RegisterLatch = value; break;
case 0xF1: if (HasYM2413) YM2413.Write(value); break;
case 0xF2: if (HasYM2413) YM2413.DetectionValue = value; break;
}
}
else if (port < 0x80) // PSG
PSG.WritePsgData(value, Cpu.TotalExecutedCycles);
else if (port < 0xC0) // VDP
{
if ((port & 1) == 0)
Vdp.WriteVdpData(value);
else
Vdp.WriteVdpControl(value);
}
else if (port == 0xF0 && HasYM2413) YM2413.RegisterLatch = value;
else if (port == 0xF1 && HasYM2413) YM2413.Write(value);
else if (port == 0xF2 && HasYM2413) YM2413.DetectionValue = value;
}
public void FrameAdvance(bool render, bool rendersound)
{