Computer Science 237 Computer Organization Williams College Fall 2005

Announcements

• Mountain day odds.
• Lab 4 - anyone who needs to finish up any wiring can see me when I'm around to get equipment. Otherwise, it's all due (on paper) in one week.
• New lab coming, but no formal lab meetings next week.

Agenda

• A bit more combinational logic
  • Full adders
  • Ripple-carry adders
  • Subtractors?
• Subroutines in 68000 Assembly
  • Call frames
  • bsr/rts protocol - return address on the stack
  • link/unlk
  • allocating space for local variables

Examples

• gcd