ID-4801 EPROM programmer?

[Chris Elmquist]

Does anyone happen to have specs for the ID-4801 EPROM programmer?

I'm curious what devices it was originally intended to support...

And I'm not having much luck finding docs for it on the web.

Chris

--
Chris Elmquist

[Terry Gulczynski]

I have the user manual right in front of me. I also have a working 4801
programmer. Finally, I also have the illustration booklet that shows how to
create personality modules for the various different EPROMs.

According to the specs, it will program 25xx and 27xx series devices up to 16K
(27128) - the device must use a single supply voltage.

The base unit came with 2K of RAM, so it could only program up to a 2K EPROM
(2716 EPROM). RAM expansion was available to bring it to 8K (2764 EPROM) and
then up to 16K (27128 EPROM).

Terry

[Chris Elmquist]

Hey Terry... thanks for the info. I was curious if it could do 2708 but
if it must be single supply (assuming that is during read), then 2708 would
be out since that one needs -5 and +5 during read.

Chris

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Chris Elmquist

[ScottyEm]

Chris,

Do you need to program a 2708? I once had a home brew programmer that
might be made functional, but I'm sure it would take me some time.

Dan

[Chris Elmquist]

On Wednesday (11/04/2009 at 05:00AM -0800), ScottyEm wrote:
>
> Chris,
>
> Do you need to program a 2708? I once had a home brew programmer that
> might be made functional, but I'm sure it would take me some time.

Thanks Dan. There is no immediate rush. I have a couple old systems
that use them and am just planning for tools I might need to restore them.

There are a couple ID-4801 on eBay which are in good shape and that's
what got me interested.

I too will probably build a 2708 programmer... and also make it do
1702 since those are used in my Altair 680b. They are equally or more
difficult to find programmers for now.

I sure wish I would have nabbed a programmer 20 yrs ago when everyone
was dumping ones that did these old devices.

Chris

--
Chris Elmquist

[Dave McGuire]

On Nov 4, 2009, at 10:20 AM, Chris Elmquist wrote:
>> Do you need to program a 2708? I once had a home brew programmer
>> that
>> might be made functional, but I'm sure it would take me some time.
>
> Thanks Dan. There is no immediate rush. I have a couple old systems
> that use them and am just planning for tools I might need to
> restore them.
>
> There are a couple ID-4801 on eBay which are in good shape and that's
> what got me interested.
>
> I too will probably build a 2708 programmer... and also make it do
> 1702 since those are used in my Altair 680b. They are equally or more
> difficult to find programmers for now.
>
> I sure wish I would have nabbed a programmer 20 yrs ago when everyone
> was dumping ones that did these old devices.

If you get into a bind, I have the ability to program 1702As here.

-Dave

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Dave McGuire
Port Charlotte, FL

[ScottyEm]

OK, Chris, I'll leave my gadget in the back of the bottom drawer,
unless I hear more.

Good luck with your project.

Dan

[Chris Elmquist]

OK. Thanks guys. Sounds like there are plenty of resources out there for
dealing with these old EPROMs. That's good.

Of course I like the challenge of building my own gadget too, so I'll
way and measure that when the time comes.

Chris

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Chris Elmquist

[dke...@hotmail.com]

Hi
The voltages used for the 1702As are so completely
different than for the 2708 that it isn't even practical
to make them as part of the same programmer. It
is easier to modify a 2716 programmer to program
2708s than to make a programmer that will do both
2708s and 1702As.
Look on bitsavers under Intel and 4004. There is a manual
with a schematic that shows a programmer board for the
1702As. It is mostly a bunch of transistors and a few oneshots.
The oneshots could easily be replaced by a uP such as
a Microchip or such. It is the level shifting that is
difficult for the 1702As.
Dwight

[Chris Elmquist]

Hi Dwight,

Good point although I was thinking there would be enough commonality
in the microcontroller, serial interface and unregulated power supply
components to share those. Then the drivers and regulated supply
components would be unique for each device.

I do have the the document you refer to as well as several other old
articles for homebrew 1702A programmers so I think I am set with the
basic design.

But-- most of this is just a brainstorm right now that was driven by
the availability of the ID-4801's on eBay and not knowing how old of
devices it could support. I think we know that now.

Thanks.

Chris

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Chris Elmquist