package main 

import (
//	 "os"
//	 "fmt"
)

type Rom []byte

func (r *Rom) Fetch(pc *uint64, n uint64) []byte {
	if (*pc + n > uint64(len(*r))) {
		return nil
	}
	x := make([]byte, n)
	copy(x, (*r)[*pc:*pc + n])
	*pc += n
	return x
}