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Commodore64: New framework PLA WIP

This commit is contained in:
saxxonpike 2013-08-16 20:11:53 +00:00
parent 30174b9b9c
commit e6c55f318d
1 changed files with 144 additions and 11 deletions
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155
BizHawk.Emulation/Computers/Commodore64/Experimental/Chips/Internals/Pla.cs
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@ -5,8 +5,69 @@ using System.Text;
namespace BizHawk.Emulation.Computers.Commodore64.Experimental.Chips.Internals
{
public class Pla
sealed public class Pla
{
#region CACHE
bool a12;
bool a13;
bool a14;
bool a15;
int addr;
bool aec;
bool ba;
bool cachedBasic;
bool cachedCASRam;
bool cachedCharRom;
bool cachedGraphicsRead;
bool cachedIO;
bool cachedKernal;
bool cachedRomHi;
bool cachedRomLo;
bool cas;
bool charen;
bool exrom;
bool game;
bool hiram;
bool loram;
bool p0;
bool p1;
bool p2;
bool p3;
bool p4;
bool p5;
bool p6;
bool p7;
bool p9;
bool p10;
bool p11;
bool p12;
bool p13;
bool p14;
bool p15;
bool p16;
bool p17;
bool p18;
bool p19;
bool p20;
bool p21;
bool p22;
bool p23;
bool p24;
bool p25;
bool p26;
bool p27;
bool p28;
bool p30;
bool p31;
bool read;
int vaddr;
bool va12;
bool va13;
bool va14;
bool va15;
#endregion
#region INPUTS
public Func<int> InputAddress;
public Func<bool> InputAEC;
public Func<bool> InputBA;
@ -18,13 +79,15 @@ namespace BizHawk.Emulation.Computers.Commodore64.Experimental.Chips.Internals
public Func<bool> InputLoRam;
public Func<bool> InputRead;
public Func<int> InputVA;
#endregion
virtual public bool Basic { get { return true; } }
virtual public bool CASRam { get { return true; } }
virtual public bool CharRom { get { return true; } }
virtual public bool GraphicsRead { get { return true; } }
virtual public bool IO { get { return true; } }
virtual public bool Kernal { get { return true; } }
#region OUTPUTS
public bool Basic { get { return cachedBasic; } }
public bool CASRam { get { return cachedCASRam; } }
public bool CharRom { get { return cachedCharRom; } }
public bool GraphicsRead { get { return cachedGraphicsRead; } }
public bool IO { get { return cachedIO; } }
public bool Kernal { get { return cachedKernal; } }
public bool OutputBasic() { return Basic; }
public bool OutputCASRam() { return CASRam; }
public bool OutputCharRom() { return CharRom; }
@ -33,9 +96,79 @@ namespace BizHawk.Emulation.Computers.Commodore64.Experimental.Chips.Internals
public bool OutputKernal() { return Kernal; }
public bool OutputRomHi() { return RomHi; }
public bool OutputRomLo() { return RomLo; }
virtual public void Precache() { }
virtual public bool RomHi { get { return true; } }
virtual public bool RomLo { get { return true; } }
virtual public void SyncState(Serializer ser) { }
public bool RomHi { get { return cachedRomHi; } }
public bool RomLo { get { return cachedRomLo; } }
public void SyncState(Serializer ser) { }
#endregion
public void Precache()
{
// PLA line information is from the PDF titled "The C64 PLA Dissected"
// Written by Thomas 'skoe' Giesel.
addr = InputAddress();
aec = InputAEC();
ba = InputBA();
cas = InputCAS();
charen = InputCharen();
exrom = InputExRom();
game = InputGame();
loram = InputLoRam();
hiram = InputHiRam();
read = InputRead();
vaddr = InputVA();
a15 = (addr & 0x08000) != 0;
a14 = (addr & 0x04000) != 0;
a13 = (addr & 0x02000) != 0;
a12 = (addr & 0x01000) != 0;
va15 = (vaddr & 0x08000) != 0;
va14 = (vaddr & 0x04000) != 0;
va13 = (vaddr & 0x02000) != 0;
va12 = (vaddr & 0x01000) != 0;
p0 = loram && hiram && a15 && !a14 && a13 && !aec && read && game;
p1 = hiram && a15 && a14 && a13 && !aec && read && game;
p2 = hiram && a15 && a14 && a13 && !aec && read && !exrom && !game;
p3 = hiram && !charen && a15 && a14 && !a13 && a12 && !aec && read && game;
p4 = loram && !charen && a15 && a14 && !a13 && a12 && !aec && read && game;
p5 = hiram && !charen && a15 && a14 && !a13 && a12 && !aec && read && !exrom && !game;
p6 = va14 && !va13 && va12 && aec && game;
p7 = va14 && !va13 && va12 && aec && !exrom && !game;
//p8 = cas && a15 && a14 && !a13 && a12 && !aec && !rd;
p9 = hiram && charen && a15 && a14 && !a13 && a12 && !aec && ba && read && game;
p10 = hiram && charen && a15 && a14 && !a13 && a12 && !aec && !read && game;
p11 = loram && charen && a15 && a14 && !a13 && a12 && !aec && ba && read && game;
p12 = loram && charen && a15 && a14 && !a13 && a12 && !aec && !read && game;
p13 = hiram && charen && a15 && a14 && !a13 && a12 && !aec && ba && read && !exrom && !game;
p14 = hiram && charen && a15 && a14 && !a13 && a12 && !aec && !read && !exrom && !game;
p15 = loram && charen && a15 && a14 && !a13 && a12 && !aec && ba && read && !exrom && !game;
p15 = loram && charen && a15 && a14 && !a13 && a12 && !aec && ba && read && !exrom && !game;
p16 = loram && charen && a15 && a14 && !a13 && a12 && !aec && !read && !exrom && !game;
p17 = a15 && a14 && !a13 && a12 && !aec && ba && read && exrom && !game;
p18 = a15 && a14 && !a13 && a12 && !aec && !read && exrom && !game;
p19 = loram && hiram && a15 && !a14 && !a13 && !aec && read && !exrom;
p20 = a15 && !a14 && !a13 && !aec && exrom && !game;
p21 = hiram && a15 && !a14 && a13 && !aec && read && !exrom && !game;
p22 = a15 && a14 && a13 && !aec && exrom && !game;
p23 = va13 && va12 && aec && exrom && !game;
p24 = !a15 && !a14 && a12 && exrom && !game;
p25 = !a15 && !a14 && a13 && exrom && !game;
p26 = !a15 && a14 && exrom && !game;
p27 = a15 && !a14 && a13 && exrom && !game;
p28 = a15 && a14 && !a13 && !a12 && exrom && !game;
//p29 = !cas;
p30 = cas;
p31 = !cas && a15 && a14 && !a13 && a12 && !aec && !read;
cachedCASRam = p0 || p1 || p2 || p3 || p4 || p5 || p6 || p7 || p9 || p10 || p11 || p12 || p13 || p14 || p15 || p16 || p17 || p18 || p19 || p20 || p21 || p22 || p23 || p24 || p25 || p26 || p27 || p28 || p30;
cachedBasic = !p0;
cachedKernal = !(p1 || p2);
cachedCharRom = !(p3 || p4 || p5 || p6 || p7);
cachedGraphicsRead = !p31;
cachedIO = !(p9 || p10 || p11 || p12 || p13 || p14 || p15 || p16 || p17 || p18);
cachedRomLo = !(p19 || p20);
cachedRomHi = !(p21 || p22 || p23);
}
}
}