scramble.c

这个是延伸mame的在wince平台下的游戏模拟器的代码

/***************************************************************************

  machine.c

  Functions to emulate general aspects of the machine (RAM, ROM, interrupts,
  I/O ports)

***************************************************************************/

#include "driver.h"


int scramble_IN2_r(int offset)
{
	int res;


	res = readinputport(2);

	/* avoid protection */
	if (cpu_getpc() == 0x00e4) res &= 0x7f;

	return res;
}



int scramble_protection_r(int offset)
{
	return 0x6f;
}