#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv)
{
	FILE *input = fopen("d:\\mame\\mame\\nvram\\indigo4k\\eeprom", "rb");
	unsigned short eeprom[0x80];
	for (int i = 0; i < 0x80; i++)
	{
		unsigned char upper = 0;
		unsigned char lower = 0;
		fread(&lower, 1, 1, input);
		fread(&upper, 1, 1, input);
		eeprom[i] = (upper << 8) | lower;
	}
	fclose(input);

	printf("EEPROM %02x: %04x\n", 0, eeprom[0]);
	int s3 = (int)0xffffffa5;
	s3 ^= eeprom[0] & 0x00ff;
	s3 <<= 24;
	s3 >>= 24;
	int t3 = s3 << 1;
	int t4 = (s3 < 0) ? 1 : 0;
	s3 = (s3 << 1) | t4;
	s3 <<= 24;
	s3 >>= 24;
	for (int i = 1; i < 0x80; i++)
	{
		printf("EEPROM %02x: %04x\n", (unsigned char)i, eeprom[i]);
		unsigned char upper = eeprom[i] >> 8;
		unsigned char lower = eeprom[i] & 0x00ff;
		unsigned char xorval = upper ^ lower;
		s3 ^= xorval;
		s3 <<= 24;
		s3 >>= 24;
		t4 = (s3 < 0) ? 1 : 0;
		s3 = (s3 << 1) | t4;
		s3 <<= 24;
		s3 >>= 24;
	}

	printf("Checksum: %08x\n", s3);
	return 0;
}