IBM 5100

From: Tony Duell <>
Date: Thu Aug 12 17:31:21 2004

> On 7 Aug 2004 at 22:53, Tony Duell wrote:
> > One day I must assemble the [HP 9830] terminal emulator ROM code from
> > the patent....
> You had mentioned in an earlier post the (U.S.) patent numbers for the
> 9810, 9820, and 9830. Would you have a list of others related to those
> units, e.g., for the ROM mentioned above? (Or is it contained in
> 4,012,725; I confess that I haven't read the entire patent...being 590
> pages, it's a bit slow going! :-)

The useful patents I know of for these machines are :
HP9810 : US3859635
HP9820 : US3839630
HP9830 : US4012725 (or GB1444141)

The ROM source I mentioned is in that 9830 patent -- as you said it's a
thick document ;-). In general you get most of the system firmware and
the option ROMs as source listings

Do be warned that there may well be differences between the machines in
the patent and the production machines. There are certainly hardware
differnces, and the firmware may have changed too (so that system
routines may be at other addresses, etc). But there's a heck of a lot of
good stuff in those patents that will point you in the right direction
if, for example, you are insane enough to want to disassemble one of the

Received on Thu Aug 12 2004 - 17:31:21 BST

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