Get remainder by 320 for old CPU

rem320.cpp

#include <cstdio>

typedef unsigned short u16;

unsigned char table[1<<10];

void prepare()
{
	for (int i=0; i<(1<<10); ++i)
		table[i] = ((i%5)<<5);
}

u16 rem320(u16 a)
{
	return (table[a>>6]*2) | (a & 0x3F);
}

int main()
{
	prepare();
	for (int i=0; i<(1<<16); ++i)
	{
		if ((i%320) != (int)rem320(i))
		{
			printf("%d\n", i);
		}
	}
	printf("end");
	return 0;
}