Fast 27c128's a problem for Pocket Pro?

[Dave Zug]

If you use the "c" denoted parts (cmos), they use less programming voltage,
and can be damaged if used in a programmer set to 25V program voltage.  be
sure your program voltage is correct. often the less expensive kits still
have the option for differnet program voltages, but are harder to change
like need tu do potentiometers/jumpers and tune it.

----- Original Message -----
From: Craig Moates <craig.moates at mindspring.com>
To: <gmecm at efi332.eng.ohio-state.edu>
Sent: Monday, November 22, 1999 8:31 PM
Subject: Re: Fast 27c128's a problem for Pocket Pro?


> Peter - I share that fear. What I have is Cypress Semiconductor
> CY27C128-70WC-9650-119203-608764. Any clarification would be
> appreciated. -Craig
>
> -----Original Message-----
> From: Peter Gargano <peter at ntserver.techedge.com.au>
> To: gmecm at efi332.eng.ohio-state.edu <gmecm at efi332.eng.ohio-state.edu>
> Date: Monday, November 22, 1999 9:57 PM
> Subject: Re: Fast 27c128's a problem for Pocket Pro?
>
>
> >> Craig Moates wrote:
> >
> >> The zero check yields 'found 00, looking for FF'. The program verify
> >> also does not check out. Haven't tried to see if programmed chips work
> yet.
> >
> >Sounds like you don't have the EPROM part you think you have
> >What are those numbers you say look like 27c128 70 nS parts.?
> >
> >
> >
> >On the theme of programmers, I've been playing with a 3 chip
> >design that'll do all the common chips (2732..27512). I have
> >the 2 chip reader working (parallel port I/F, uses 74HC404
> >and 74LS257, programmer will add just a 74xx374 and perhaps a
> >transistor) - I'm interested if others have seen an existing
> >low chip count burner (parallel port), or if anyone wants to
> >share their own low chip count designs with me. I intend
> >making it freely available when it's working 100%.
> >
> >regards,
> >--
> >Peter Gargano
>
>