[rescue] WANTED: Apple II cards
abuse at cabal.org.uk
Mon May 14 05:33:17 CDT 2007
On Sun, May 13, 2007 at 11:54:52PM -0400, Charles Shannon Hendrix wrote:
> With an old micro, they might be slow, but the realtime response can
> actually be quite good because the pipeline between sensor and CPU is
> relatively simple, you can probe it, and you can learn it inside and out.
Interrupt latencies have not decreased in any meaningful manner in the last
25 years. It still takes of the order of a microsecond. Instead of pushing
the program counter onto the stack and loading a new value, it's now a
pipeline flush, dumping hundreds of bytes onto the stack, pipeline reload,
plus cache misses...
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