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More keys. Implemented Border. Completes LOAD readiness sequence

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This commit is contained in:
Marc Parsons
2026-04-18 01:55:08 +01:00
parent 389df3780e
commit 47f3a76bb2
5 changed files with 188 additions and 34 deletions
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45
Desktop/DebuggerForm.cs
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@@ -822,6 +822,11 @@ namespace Desktop
case 0xD8:
mnemonic = "RET C";
break;
case 0xDB: // IN A, (n)
n = _memoryBus.Read((ushort)(currentPc + 1));
mnemonic = $"IN A, (0x{n:X2})";
instructionLength = 2;
break;
case 0xDD:
{
byte ddOpcode = _memoryBus.Read((ushort)(currentPc + 1));
@@ -836,6 +841,39 @@ namespace Desktop
mnemonic = $"LD IX, 0x{ixVal:X4}";
instructionLength = 4;
}
else if (ddOpcode == 0x36) // LD (IX+d), n
{
sbyte d = (sbyte)_memoryBus.Read((ushort)(currentPc + 2));
n = _memoryBus.Read((ushort)(currentPc + 3));
string sign = d >= 0 ? "+" : "";
mnemonic = $"LD (IX{sign}{d}), 0x{n:X2}";
instructionLength = 4;
}
else if (ddOpcode == 0x74) // LD (IX+d), H
{
sbyte d = (sbyte)_memoryBus.Read((ushort)(currentPc + 2));
string sign = d >= 0 ? "+" : "";
mnemonic = $"LD (IX{sign}{d}), H";
instructionLength = 3;
}
else if (ddOpcode == 0x75) // LD (IX+d), L
{
sbyte d = (sbyte)_memoryBus.Read((ushort)(currentPc + 2));
string sign = d >= 0 ? "+" : "";
mnemonic = $"LD (IX{sign}{d}), L";
instructionLength = 3;
}
else if (ddOpcode == 0xE1) // POP IX
{
mnemonic = "POP IX";
instructionLength = 2;
}
else if (ddOpcode == 0xE5) // PUSH IX
{
mnemonic = "PUSH IX";
instructionLength = 2;
}
else if (ddOpcode == 0xE9) // JP (IX)
{
mnemonic = "JP (IX)";
@@ -1037,6 +1075,13 @@ namespace Desktop
mnemonic = $"LD L, (IY{signL}{offsetL})";
instructionLength = 3;
}
else if (fdOpcode == 0x72) // LD (IY+d), D
{
sbyte d = (sbyte)_memoryBus.Read((ushort)(currentPc + 2));
string sign = d >= 0 ? "+" : "";
mnemonic = $"LD (IY{sign}{d}), D";
instructionLength = 3;
}
else if (fdOpcode == 0x74) // LD (IY+d), H
{
sbyte d = (sbyte)_memoryBus.Read((ushort)(currentPc + 2));