58 lines
1.6 KiB
C
58 lines
1.6 KiB
C
//
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// Virtual 65C02 Header file
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//
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// by James Hammons
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// (c) 2005-2018 Underground Software
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//
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#ifndef __V65C02_H__
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#define __V65C02_H__
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#include <stdint.h>
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// Useful defines
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#define FLAG_N 0x80 // Negative
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#define FLAG_V 0x40 // oVerflow
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#define FLAG_UNK 0x20 // ??? (always set when read?)
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#define FLAG_B 0x10 // Break
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#define FLAG_D 0x08 // Decimal
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#define FLAG_I 0x04 // Interrupt
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#define FLAG_Z 0x02 // Zero
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#define FLAG_C 0x01 // Carry
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#define V65C02_ASSERT_LINE_RESET 0x0001 // v65C02 RESET line
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#define V65C02_ASSERT_LINE_IRQ 0x0002 // v65C02 IRQ line
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#define V65C02_ASSERT_LINE_NMI 0x0004 // v65C02 NMI line
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#define V65C02_STATE_ILLEGAL_INST 0x0008 // Illegal instruction executed flag
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//#define V65C02_START_DEBUG_LOG 0x0020 // Debug log go (temporary!)
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// Useful structs
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struct V65C02REGS
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{
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uint16_t pc; // 65C02 PC register
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uint8_t cc; // 65C02 Condition Code register
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uint8_t sp; // 65C02 System stack pointer (bound to $01xx)
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uint8_t a; // 65C02 A register
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uint8_t x; // 65C02 X index register
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uint8_t y; // 65C02 Y register
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uint64_t clock; // 65C02 clock (@1 MHz, wraps at 570,842 years)
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uint8_t (* RdMem)(uint16_t); // Address of BYTE read routine
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void (* WrMem)(uint16_t, uint8_t); // Address of BYTE write routine
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void (* Timer)(uint16_t); // Address of Timer routine
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uint16_t cpuFlags; // v65C02 IRQ/RESET flags
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uint64_t overflow; // # of cycles we went over last time through
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};
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// Global variables (exported)
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extern bool dumpDis;
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// Exported functions
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void Execute65C02(V65C02REGS *, uint32_t);
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#endif // __V65C02_H__
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