Programming Delco EPROM's.

[thergen at svn.net]

I've seen 25v, 21v, and 12.5v (approximate) Vpp voltages required on
various 2732 devices.  Also, Some of these devices are more sensitive than
others to the UV wavelength of the light that used to try to erase them.
If you're having trouble erasing them, try comparing the wavelength of the
light you're using with that required by for erasure by the eprom -- if
you can still find the spec for either.

I've made adapters in the past for programming a 12.5v part using a
resistor and zener diode and a 21v programming voltage setting (Tom S.,
email me if you haven't found the similiar info you're looking for).

Tom

On Fri, 13 Aug 1999, DC Smith wrote:

> I never have had much luck programming the original delco chips from
> the 7148 boxes. Maybe once in a while I may get one to take. (if I try
> about 10) I don't know what chip to use, but usually set my ROMMAX up
> with the generic 2732A algorythym. Sometimes it works, sometimes not.
>  I have my best luck just pitching the delco chips and using the Intel
> 2732A's . They even self ident in my programmer, where as most other
> chips will not.
> 
>  Good luck!
> 
> Richard Wakeling wrote:
> > 
> > Hi Ross,
> > 
> > The program speed I use for most of the Delco eproms is
> > INTL (1ms retry intelligent). Its a little slow but seems reliable.
> > The computer I use for programming eproms is an old 386 running at 40
> > MHZ. I have heard that the faster pc can cause problems when burning
> > eproms.
> > 
> > Cheers Richard.
> > 
> > Ross Myers wrote:
> > >
> > 
> > > Mmmm, not where I was heading, I ment each manufacturer has a programming
> > > algorithm for their EPROM's, i.e. AMD recommend 12.75V @Vpp, and programming
> > > pulses of 100uS. What about the Delco I.C's?.
> > >
> > > Bye
> > >
> > > Ross Myers
> 
> -- 
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> Dan Smith      84 Regal   12.03 at 110.45     GSCA# 1459
> St.Charles, Missouri 
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