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internal/vm/{exec_funcs,opcodes}: add support for executing INX
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@ -69,3 +69,13 @@ func execINX(a *Appleone, o op) error {
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a.setNegativeIfOverflow(b)
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return nil
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}
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// Y + 1 -> Y N Z C I D V
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// + + - - - -
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func execINY(a *Appleone, o op) error {
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b := a.cpu.y + 1
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a.cpu.y = b
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a.setZeroIfNeeded(b)
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a.setNegativeIfOverflow(b)
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return nil
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}
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@ -113,13 +113,13 @@ var opcodes = map[uint8]op{
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// addressing assembler opc bytes cyles
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// --------------------------------------------
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// implied INX E8 1 2
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0xE8: newOp("INX", 0xE8, 1, implied, todo),
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0xE8: newOp("INX", 0xE8, 1, implied, execINX),
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// INY Increment Index Y by One
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// addressing assembler opc bytes cyles
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// --------------------------------------------
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// implied INY C8 1 2
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0xC8: newOp("INY", 0xC8, 1, implied, todo),
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0xC8: newOp("INY", 0xC8, 1, implied, execINY),
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// TAX Transfer Accumulator to Index X
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// addressing assembler opc bytes cyles
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