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Don't sync the 68K clock to the VDP clock unless the 68K had to wait for the VDP. This unfortunately breaks the direct color DMA demos, but should be more correct overall.
author Mike Pavone <pavone@retrodev.com>
date Sun, 19 May 2013 13:47:47 -0700
parents a8ee7934a1f8
children 2f264d2a60c2
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#ifndef BLASTEM_H_
#define BLASTEM_H_

#include <stdint.h>
#include "m68k_to_x86.h"
#include "z80_to_x86.h"
#include "ym2612.h"
#include "vdp.h"

typedef struct {
	uint32_t th_counter;
	uint32_t timeout_cycle;
	uint8_t output;
	uint8_t control;
	uint8_t input[3];
} io_port;

typedef struct {
	m68k_context   *m68k;
	z80_context    *z80;
	vdp_context    *vdp;
	ym2612_context *ym;
} genesis_context;

#define GAMEPAD_TH0 0
#define GAMEPAD_TH1 1
#define GAMEPAD_EXTRA 2

extern io_port gamepad_1;
extern io_port gamepad_2;

void io_adjust_cycles(io_port * pad, uint32_t current_cycle, uint32_t deduction);
uint16_t read_dma_value(uint32_t address);
m68k_context * debugger(m68k_context * context, uint32_t address);

#endif //BLASTEM_H_