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Portable EPROM Reader for HP41
Message #1 Posted by Steve Hodges on 23 Mar 1999, 6:35 a.m.

I have just seen a picture of a "HHP Portable EPROM" for a HP-41C. It looks just like a card reader.

Does anyone have any information about this?

When were they made?

What do they do?

Are they a self contained unit (can they burn EPROMS?)

What did they cost new?

What do they go for these days?

Re: Portable EPROM Reader for HP41
Message #2 Posted by Reinhard Hawel on 23 Mar 1999, 12:35 p.m.,
in response to message #1 by Steve Hodges

I don't know something about the HHP device (this was a company called Hand Held Products), but I know something about a device by W&W software, a big german provider for HP-41 articles. Maybe this is just a labeled HHP product. Here a quote from my 1987 Educalc Catalogue:

EPROM BOX (W&W Software)

An EPROM box the size and shape of a card reader! It plugs in just like the card reader (using only one port), but it stores up to 32 k of EPROM storage. Now you can have huge application programs or giant amounts of fixed data at your fingertips. Application areas include survey calculations, oil field computation, flight support, insurance analysis and other areas where small size and large memory requirements are essential. Programming for the EPROMs can be accomplished through the EPROM Programmer (Stoch #TI-615) or supplied as an EPROM Service (see seperate description) Stock #41-526 (EPROM Box).............145.95

end quote

I think I could try building such a thing, if somebody else is interested. This is just a matter of my spare time. Anybody interested?

Re: Portable EPROM Reader for HP41
Message #3 Posted by Jerry Ballard on 9 Apr 1999, 12:17 a.m.,
in response to message #2 by Reinhard Hawel

I owned one of these with 32K memory. It worked great. I even took it apart and upgraded it to 64K. The design would support 32K or 64K paged. Wish now that I had kept it, but sold it when I needed some money. Any way, before I sold it, I took it apart and drew the schematics to it thinking that I would build myself. Well, I still have the schematics. I would be glad to share the schematics if someone would be interested in just having the PCBs done. Let me know. Jerry Remove "nospam" to reply by email

Re: Portable EPROM Reader for HP41
Message #4 Posted by Dan Grelinger on 28 Mar 1999, 5:01 p.m.,
in response to message #1 by Steve Hodges

Steve, Depending on what you want to do, there are a couple of things that would work better. Reinhard Hawel's suggestion is one of them, and another manufacturer (Eramco Systems from the Netherlands) made them as well. Much easier to use than EPROM, and in the case of a cardreader. The other option is EPROMS that were made to fit into a standard Hp-41 module. These are prgrammed by the HP-41 itself with a small programming fixture. The bad news, all of these things are tough to find. I have most of them, but you have to look for a long time.

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