sub.h File Reference

#include "z80.h"

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Functions
__BEGIN_DECLS void	_dec8 (uint8_t *, struct z80 *)
	decrements an 8-bit register More...
void	_sub_a_reg8 (struct z80 *, uint8_t *)
	subtracts reg from the A register More...
void	_sub_a_mem (struct z80 *, uint8_t *)
	subtracts the contents of a memory address from the A register More...
void	_sbc_a_reg8 (struct z80 *, uint8_t *)
	subtracts an 8-bit register from the A register with carry More...
void	_cp (uint8_t *, struct z80 *)
	set flags as if operand was subtracted from A More...

Detailed Description

Author

Peter H. Ezetta

Function Documentation

_cp()

void _cp	(	uint8_t *	reg,
		struct z80 *	cpu
	)

set flags as if operand was subtracted from A

Parameters

reg	register to subtract from A
cpu	z80 CPU object

The CP instruction sets the flags as if the operand to CP were subtracted from the A register, however the subtraction does not actually occur, and the original value of A is left untouched.

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_dec8()

__BEGIN_DECLS void _dec8	(	uint8_t *	n,
		struct z80 *	cpu
	)

decrements an 8-bit register

Parameters

n	register to decrement
cpu	z80 CPU object

Bug:

dec8 isn't operating on flags

_sbc_a_reg8()

void _sbc_a_reg8	(	struct z80 *	cpu,
		uint8_t *	reg
	)

subtracts an 8-bit register from the A register with carry

Parameters

cpu	z80 CPU object
reg	register to subtract from A

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_sub_a_mem()

void _sub_a_mem	(	struct z80 *	cpu,
		uint8_t *	memory
	)

subtracts the contents of a memory address from the A register

Parameters

cpu	z80 CPU object
memory	pointer to memory to subtract from the A register

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_sub_a_reg8()

void _sub_a_reg8	(	struct z80 *	cpu,
		uint8_t *	reg
	)

subtracts reg from the A register

Parameters

cpu	z80 CPU object
reg	8-bit register to subtract from A

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