>
> Only thing is, I want to be able to program '54s as well.  The PIP-02
> files refer to a 'ProCheap 1.0' programmer which can do this.  Anybody
> know anything about this one?
>
> I'm assuming I'll have to bootstrap via an 84, unless anyone knows
> of a 16C54 programmer on about the same budget.  (Perhaps slightly
> more: the windowed parts aren't cheap, so I suppose I can afford
> a similar amount on the programmer)  I know the ETI design does
> these, I was wondering if there are any others?

You'll probably have to to bootstrap something. The key difference is that
EEPROM has self timed writes while EPROM requires the programmer to both
start and stop the write. And at 100 uS +- 5 uS it's a bit difficult to
get that precise a timing resolution.

That's how the 16C84 can help because once programmed it can generate
timing like that.

I use my 16C84 as a RAM loader for 17C42's. Takes a few chips but it's
nice to have instant turnarounds.

BAJ