Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!uunet!mcvax!ukc!its63b!hwcs!zen!frank
From: frank@zen.UUCP (Frank Wales)
Newsgroups: comp.sys.hp
Subject: Re: System Programming on the HP28C (A Question)
Message-ID: <706@zen.UUCP>
Date: Wed, 28-Oct-87 17:34:44 EST
Article-I.D.: zen.706
Posted: Wed Oct 28 17:34:44 1987
Date-Received: Wed, 4-Nov-87 04:45:16 EST
References: <3970@watdcsu.waterloo.edu>
Reply-To: frank@zen.UUCP (Frank Wales)
Organization: Zengrange Limited, Leeds, England
Lines: 41
Keywords: HPCC HP-28C book
Summary: Lots of info soon

In article <3970@watdcsu.waterloo.edu> bmaraldo@watdcsu.UUCP writes:
>  Can it be done as on the 41 series?  There is an object evaluation
>  command defined in the reference manual called SYSEVAL (pg. 43) which
>  looks like it might be useful for some system work.  It might be
>  interesting to dabble with the insides of the 28C.  Any comments?
>
>				Brett L Maraldo
>
>  p.s. If anyone has any interesing applications for the 28C, I'd be
>  interested in hearing from you.

Well, now.  A lot of work has been done on the HP-28C, much of it by
members of the British HP calculator club HPCC (Hand-held and Portable
Computer Club), and one of our members is preparing a book on the HP-28C.

Many things have been published on the HP-28C: would you like to know
lots of useful SYSEVAL entry points?  Or how to write machine-code functions
on the HP-28C?  All this and much more will be in the book.

Other information on the HP-28C is available; did you know that a service
is available to add 32K RAM to it (actually speeding it up
because it doesn't garbage-collect as often)? 

One of my colleagues here at Zengrange is disassembling the entire HP-28C
operating system in his spare time, and that info will appear in our
club journal (Datafile) at some stage soon.

Much is being done by many people around the world to unlock the secrets
of the HP-28C, and much valuable work is already being published.  HP are
not in any way supporting this venture, and, of course, do not endorse any
of its results (though I suspect certain engineers at HP's Hand-held
Computer and Calculator Operation in Corvallis will be most intrigued by
how well we are doing in duplicating the unreleased HP-28C Internal Design
Specification).

If more information on the HP Calculator User Groups is desired, e-mail
me and I'll post a summary of all User Group addresses and contacts.


Frank Wales, Committee Member, HPCC, [frank@zen.uucp<->!mcvax!zen.co.uk!frank]
Zengrange Ltd., Greenfield Rd., Leeds, ENGLAND, LS9 8DB. (+44) 532 489048 x220.