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Results tagged with instruction-set
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user 780
For questions regarding the instruction sets of microprocessors.
12
votes
Are there any articles elucidating the history of the POPCOUNT instruction?
I would guess the answer is very simple and obvious:
CPU makers don't just implement what they want, what "looks nice in a spec" or "what's easily done". They are driven by the market and implement …
- 37k
17
votes
Why does the Z80 include the RLD and RRD instructions?
RLD and RRD are simple 4-bit shifts of BCD-coded values. As they are shifting by one decimal digit right or left, they effectively result in a multiplication (or division) by 10 (assumed A is 0) when …
- 37k
13
votes
Accepted
What is the instruction set of the Z4?
Horst Zuse (Konrad Zuse's son, a computer science professor by trade) has a homepage where he supplies (and sells) various pieces of information, booklets and CDs and DVDs about his father's work.
Th …
- 37k
26
votes
Accepted
Uses for the halt instruction?
The HALT condition does not (at least on retro CPUs) consume considerably less power than normal execution does.
One very obvious use case is synchronizing program flow with external (hardware) events …
- 37k