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Intellivision STIC clean up

This commit is contained in:
alyosha-tas 2016-12-26 14:17:04 -05:00 committed by GitHub
parent a01f7c3502
commit 46966ef7c9
1 changed files with 45 additions and 63 deletions
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108
BizHawk.Emulation.Cores/Consoles/Intellivision/STIC.cs
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@ -43,6 +43,8 @@ namespace BizHawk.Emulation.Cores.Intellivision
ser.Sync("Pending_Cycles", ref PendingCycles);
ser.Sync("Registers", ref Register, false);
Update_Border();
ser.EndSection();
}
@ -86,7 +88,7 @@ namespace BizHawk.Emulation.Cores.Intellivision
for (int i=0;i<64;i++)
{
Register[i] = register_mask(i, 0);
write_reg(i, 0);
}
}
@ -110,54 +112,66 @@ namespace BizHawk.Emulation.Cores.Intellivision
Sst = value;
}
// mask off appropriate STIC bits
private ushort register_mask(int reg, ushort value)
// mask off appropriate STIC bits and write to register
private void write_reg(int reg, ushort value)
{
if (reg < 8)
if (reg < 0x8)
{
return (ushort)((value & 0x7FF) | 0x3800);
value = (ushort)((value & 0x7FF) | 0x3800);
}
else if (reg < 16)
else if (reg < 0x10)
{
return (ushort)((value & 0xFFF) | 0x3000);
value = (ushort)((value & 0xFFF) | 0x3000);
}
else if (reg < 24)
else if (reg < 0x18)
{
return (ushort)(value & 0x3FFF);
value = (ushort)(value & 0x3FFF);
}
else if (reg < 32)
else if (reg < 0x20)
{
return (ushort)((value & 0x3FF) | 0x3C00);
value = (ushort)((value & 0x3FF) | 0x3C00);
}
else if (reg < 40)
else if (reg < 0x28)
{
return (ushort)(0x3FFF);
value = (ushort)(0x3FFF);
}
else if (reg < 45)
else if (reg < 0x2D)
{
if (reg==0x2C)
Update_Border();
return (ushort)((value & 0xF) | 0x3FF0);
value = (ushort)((value & 0xF) | 0x3FF0);
}
else if (reg < 48)
else if (reg < 0x30)
{
return (ushort)(0x3FFF);
value = (ushort)(0x3FFF);
}
else if (reg < 51)
else if (reg < 0x33)
{
if (reg==50)
if (reg==0x32)
{
return (ushort)((value & 0x3) | 0x3FFC);
value = (ushort)((value & 0x3) | 0x3FFC);
}
else
return (ushort)((value & 0x7) | 0x3FF8);
else
value = (ushort)((value & 0x7) | 0x3FF8);
}
else if (reg < 64)
else if (reg < 0x40)
{
return (ushort)(0x3FFF);
value = (ushort)(0x3FFF);
}
Register[reg] = value;
if (reg==0x21)
{
Fgbg = true;
}
if (reg==0x20)
{
active_display = true;
}
if (reg==0x2C)
{
Update_Border();
}
return value;
}
public ushort? ReadSTIC(ushort addr)
@ -233,15 +247,7 @@ namespace BizHawk.Emulation.Cores.Intellivision
{
if (in_vb_1 | !active_display)
{
if (addr == 0x0021)
{
Fgbg = true;
}
if (addr == 0x0020)
{
active_display = true;
}
Register[addr] = register_mask(addr, value);
write_reg(addr, value);
return true;
}
}
@ -251,15 +257,7 @@ namespace BizHawk.Emulation.Cores.Intellivision
{
if (in_vb_1 | !active_display)
{
if (addr == 0x4021)
{
Fgbg = true;
}
if (addr == 0x4020)
{
active_display = true;
}
Register[addr - 0x4000] = register_mask(addr - 0x4000, value);
write_reg(addr-0x4000, value);
return true;
}
}
@ -269,15 +267,7 @@ namespace BizHawk.Emulation.Cores.Intellivision
{
if (in_vb_1 | !active_display)
{
if (addr == 0x8021)
{
Fgbg = true;
}
if (addr == 0x8020)
{
active_display = true;
}
Register[addr & 0x003F] = register_mask(addr & 0x003F, value);
write_reg(addr-0x8000, value);
return true;
}
}
@ -287,15 +277,7 @@ namespace BizHawk.Emulation.Cores.Intellivision
{
if (in_vb_1 | !active_display)
{
if (addr == 0xC021)
{
Fgbg = true;
}
if (addr == 0xC020)
{
active_display = true;
}
Register[addr - 0xC000] = register_mask(addr - 0xC000, value);
write_reg(addr-0xC000, value);
return true;
}
}