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Initial implementation of Alto I support. Still need proper Constants ROM for Alto I. Changed IDISP to use ACSOURCE ROM (small perf increase).

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This commit is contained in:
Josh Dersch
2016-04-13 15:45:33 -07:00
parent a9428a91d8
commit a62ac823ed
56 changed files with 571 additions and 143 deletions
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31
Contralto/Memory/Memory.cs
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@@ -7,6 +7,23 @@ namespace Contralto.Memory
{
public Memory()
{
// Set up handled addresses based on the system type.
if (Configuration.SystemType == SystemType.AltoI)
{
_addresses = new MemoryRange[]
{
new MemoryRange(0, _memTop), // Main bank of RAM to 176777; IO page above this.
};
}
else
{
_addresses = new MemoryRange[]
{
new MemoryRange(0, _memTop), // Main bank of RAM to 176777; IO page above this.
new MemoryRange(_xmBanksStart, (ushort)(_xmBanksStart + 16)), // Memory bank registers
};
}
Reset();
}
@@ -20,7 +37,7 @@ namespace Contralto.Memory
public void Reset()
{
// 4 64K banks
// 4 64K banks, regardless of system type. (Alto Is just won't use the extra memory.)
_mem = new ushort[0x40000];
_xmBanks = new ushort[16];
}
@@ -48,12 +65,12 @@ namespace Contralto.Memory
{
// Check for XM registers; this occurs regardless of XM flag since it's in the I/O page.
if (address >= _xmBanksStart && address < _xmBanksStart + 16)
{
{
_xmBanks[address - _xmBanksStart] = data;
Log.Write(LogComponent.Memory, "XM register for task {0} set to bank {1} (normal), {2} (xm)",
(TaskType)(address - _xmBanksStart),
(data & 0xc) >> 2,
(data & 0x3));
(data & 0x3));
}
else
{
@@ -62,7 +79,7 @@ namespace Contralto.Memory
{
Log.Write(LogComponent.Memory, "Extended memory write, bank {0} address {1}, data {2}", GetBankNumber(task, extendedMemory), Conversion.ToOctal(address), Conversion.ToOctal(data));
} */
address += 0x10000 * GetBankNumber(task, extendedMemory);
address += 0x10000 * GetBankNumber(task, extendedMemory);
_mem[address] = data;
}
@@ -78,11 +95,7 @@ namespace Contralto.Memory
return extendedMemory ? (_xmBanks[(int)task]) & 0x3 : ((_xmBanks[(int)task]) & 0xc) >> 2;
}
private readonly MemoryRange[] _addresses =
{
new MemoryRange(0, _memTop), // Main bank of RAM to 176777; IO page above this.
new MemoryRange(_xmBanksStart, (ushort)(_xmBanksStart + 16)), // Memory bank registers
};
private readonly MemoryRange[] _addresses;
private static readonly ushort _memTop = 0xfdff; // 176777
private static readonly ushort _xmBanksStart = 0xffe0; // 177740