53 lines
1.4 KiB
C
53 lines
1.4 KiB
C
#ifndef __EMULATOR_H
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#define __EMULATOR_H
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#include <stdint.h>
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/* Accessing memory */
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extern uint8_t read6502(uint16_t address);
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extern void write6502(uint16_t address, uint8_t value);
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/* Call this once before you begin execution. */
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void reset6502();
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/* Execute 6502 code up to the next specified count of clock ticks. */
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void exec6502(uint32_t tickcount);
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/* Execute a single instruction. */
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void step6502();
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/* Trigger a hardware IRQ in the 6502 core. */
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void irq6502();
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/* Trigger an NMI in the 6502 core. */
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void nmi6502();
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/* Pass a pointer to a void function taking no parameters. This will
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cause Fake6502 to call that function once after each emulated
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instruction. */
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void hookexternal(void *funcptr);
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/* Useful variables in this emulator */
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/* Running total of the emulated cycle count. */
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extern uint32_t clockticks6502;
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/* Running total of the total emulated instruction count. This is not
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related to clock cycle timing. */
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extern uint32_t instructions;
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/* When this is defined, undocumented opcodes are handled otherwise,
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they're simply treated as NOPs. */
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#define UNDOCUMENTED
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/* When this is defined, the binary-coded decimal (BCD) status flag
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is not honored by ADC and SBC. The 2A03 CPU in the Nintendo
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Entertainment System does not support BCD operation. */
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#undef NES_CPU
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/* 6502 CPU registers */
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extern uint16_t pc;
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extern uint8_t sp, a, x, y, status;
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#endif /* __EMULATOR_H */
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