[Coco] About those EPROMS...

[Salvador Garcia]

Thanks Robert, I am reading this article now. Salvador




-----Original Message-----
From: Robert Gault <robert.gault at att.net>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Wed, Apr 8, 2015 7:34 pm
Subject: Re: [Coco] About those EPROMS...


Salvador Garcia wrote:
>
> Hi all, I’ve been reading the discussions that talk
aboutEPROMs. This got my curiosity going. What reference material is recommended
tolearn more on how to interface an EPROM (family 2732/64/128 etc) ?
> For
example, if I want a dump of its contents, how would I goabout that? I found
this instructable:
> http://www.instructables.com/id/EPROM-reader/
> However,  I
would hopeto find something better as it is not my idea to address the EPROM one
addressat a time! I searched for the pinout and it seems rather simple. Only
threecontrol signals: /PGM, /OE and /CE. For normal use keep /PGM high and to
readget the address on the bus and bring down /CE and /OE. The documentation
doesnot specify what the difference between these two signals is or what happens
ifI tie them together and just bring them down at the same time. It also does
notmention if these inputs are high (or low) if not connected (or HiZ); I
wouldimagine that they would be high.
> Any pointers on where I can find reading
material to learnmore about these ships is appreciated. In the meantime I'll
continue looking. Thanks! Salvador
>

There was a good article in The Rainbow by
Tony DiStefano, March 1988, p158-159. 
You can also get data sheets for specific
EPROMs.

Robert


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