> Last week I asked the question if anybody knew of an add on signal level
> translator for the Picmaster emulator. I didn't receive any replies which
> prompts me to ask "Does anybody run on 3 volts?" If you do run on 3
> volts how do you emulate during debug? I understand that if the total
> system could be ran at 5 volts then it wouldn't require a translation,
> one would turn up the voltage, emulate till "all" bugs are gone, then
> set the voltage back down to 3 and hope the additional prop delays don't
> cause any problems.
> I cann't do that because of the analog circuits in the system.
> Maybe the questions to ask are"
>  "Does anybody know of an emulator that runs at 3/5 volts ?"
>  "Is there a market for an emulator signal level translator?"
>  "Am I the first in the history of mankind to face this problem?"

Well, one approach which may sometimes work is to run the CPU off +5, every-
thing else off +3, and put resistors on the PIC outputs to avoid excessively
overdriving the stuff that expects +3.  If you're operating in the digital
domain, this technique should work (if you're careful that the +3 rail does
not bounce all over the place) even if you have analog stuff in the circuit.
If you're relying on the PIC's inputs or outputs to have certain analog be-
haviors (e.g. switching at some magic threshhold) then you may be out of
luck (even when running off +5, though, emulators are often dicey on such
things anyway).