[sebhc] Dave Dunfield's H8 emulator
jack.rubin at ameritech.net
Thu May 13 06:30:08 CDT 2004
> Btw, an SX16 should work, but it's getting on the low range
> for the emulator - There are two speed issues:
> B) The emulator requires a calibration to emulate this
> interrupt correctly
> - It has an ongoing "correction" which gets applied to
> account for drift
> in the operating environment, but it does not currently
> perform a calibration
> at startup - I have been assuming a relatively fast machine.
> It will probably work OK if you leave it sit long enough!
> My 386/33 took a few seconds to get synced, then
> everything was OK - it
> executes about 260,000 virtual 8080 instruction/second (on
> contrast to
> about 20mips on my P3/733).
> Once I add a startup calibration it should work much
> better on slower
Usually, H8 comes up with a constant beep on the sx. It responds to a
reset but then goes back to beeping as soon as a key is pressed. It does
seem to be attempting to synch, but it's not succeeding. I'll try giving
it several-to-many seconds between keypresses to see if that helps, but
clearly this is not a big problem.
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