A certain computer has ten registers and 1,000 words of RAM. Each register or RAM location holds a three-digit integer between 0 and 999. Instructions are encoded as three-digit integers and stored in RAM. The encodings are as follows: 100 means halt 2dn means set register d to n (between 0 and 9) 3dn means add n to register d 4dn means multiply register d by n 5ds means set register d to the va..