35 lines
1.1 KiB
C
35 lines
1.1 KiB
C
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#ifndef CPU_OP_H
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#define CPU_OP_H
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// The number associated with each op code is the matching line of the ALU op code.
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// Based on the table here: https://www.nesdev.org/wiki/CPU_unofficial_opcodes
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enum op_code_base {
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OP_CODE_BASE_ORA = 0x00,
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OP_CODE_BASE_AND = 0x20,
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OP_CODE_BASE_EOR = 0x40,
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OP_CODE_BASE_ADC = 0x60,
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OP_CODE_BASE_STA = 0x80,
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OP_CODE_BASE_LDA = 0xa0,
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OP_CODE_BASE_CMP = 0xc0,
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OP_CODE_BASE_SBC = 0xe0
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};
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typedef enum {
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ADDR_MODE_ABSOLUTE, // a
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ADDR_MODE_ABSOLUTE_JUMP, // (a)
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ADDR_MODE_ABSOLUTE_INDEXED_X, // a,x
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ADDR_MODE_ABSOLUTE_INDEXED_Y, // a,y
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ADDR_MODE_ACCUMULATOR, // A
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ADDR_MODE_IMMEDIATE, // #i
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ADDR_MODE_IMPLICIT, // Imp
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ADDR_MODE_INDIRECT_X, // (d,x)
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ADDR_MODE_INDIRECT_JUMP, //
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ADDR_MODE_INDIRECT_Y, // (d),y
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ADDR_MODE_RELATIVE, // label
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ADDR_MODE_ZERO_PAGE, // d
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ADDR_MODE_ZERO_PAGE_INDEXED_X, // d,x
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ADDR_MODE_ZERO_PAGE_INDEXED_Y, // d,y
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} AddressingMode;
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#endif
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