### A good answer might be:

Text files---files of bytes that can be interpreted as ASCII characters.

# Two plus Three

Word processors usually create "binary" files and so are not suitable for creating source files. They can be forced to output a text file, but a real programming editor is much nicer. With your program (text) editor create a file called addup.asm. (With most text editors and Web browsers you can copy the following code from the Web page and then paste into the editor).

    ## Program to add two plus three
            .text
            .globl  main

    main:
            ori     $8,$0,0x2       # put two's comp. two into register 8
            ori     $9,$0,0x3       # put two's comp. three into register 9
            addu    $10,$8,$9       # add register 8 and 9, put result in 10

    ## End of file

The first "#" of the first line is in column one. The character "#" starts a comment; everything on the line from "#" to the right is ignored. Sometimes I use two in a row for emphasis, but only one is needed.

Each of the three lines following main: corresponds to one machine instruction.

### QUESTION 5:

(Review: ) What is a machine instruction?