These "counter and register notes" web pages contain pictures shown in class of different variations on counters and registers.

1. Ripple counter
2. Synchronous counter
3. Synchronous counter with reset
4. Very simple register (parallel load)
5. Very simple shift register (serial load)
6. Designing a circuit which can shift or load
7. More realistic shift register with parallel load

Also see notes about the stability of sequential circuit states, especially regarding the assignment two question

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[list of course notes topics available]
[main course page]