Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!uunet!tellab5!ram
From: ram@tellabs.com (Bob Martin)
Newsgroups: comp.sys.handhelds
Subject: Other HP48 memory card sources, TETRAS
Message-ID: <4550@tellab5.tellabs.com>
Date: 15 Nov 90 01:48:27 GMT
Sender: news@Tellabs.COM
Organization: Tellabs, Inc. Lisle IL
Lines: 35

About 8 or 9 days ago, someone posted a question about other sources of memory
cards (in this case, a Korg keyboard).  No one has replied to his question, and
I was wondering why.  I told a friend of mine about this article, and he said
the net had already been through this subject last spring, so I'm curious why
nobody has posted a synopsis of what was determined back then.  Below are some
details of what my friend can remember.

The memory cards in the HP (ROM, RAM, etc.) are a standard format found in many
products, specifically laptop/handheld gadgets and music keyboards/synths.
Most of them are made by Epson, and are pretty much interchangeable.  Epson
makes the RAM unit for HP, but HP spec'ed some special parts, so the HP model
is more expensive.  From what I can gather, the voltage regulator in the normal
part is too sensitive when used in a 48, since the 48 runs at less than 5VDC.
HPs part has a different regulator.  I think the other cards will work in a
48, but when battery power gets low, you could lose what's in the RAM card.
If this is correct, then if you make sure to always change batteries before they
get low, you should be able to use these cards (this is an assumption on my
part).

If anybody has any reliable information, please post.  The reason I
care is that I (anybody, actually) can get these standard RAM cards (128KB)
for $60 apiece mail order.


BEGGING mode on:
Would the guys who have machine language TETRAS please pretty please post it!
I'm going nuts waiting for it!

Thanks!

--
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Bob Martin		|  ram@tellabs.com	...!uunet!tellab5!ram
Tellabs, Inc.		|"Listen to me now, and believe me later" - Hans & Franz
Lisle, IL.  60532	|"Flibble-dee Floo" - Grumpy Old Man