12 Aug
2004
12 Aug
'04
10:31 a.m.
On 7 Aug 2004 at 22:53, Tony Duell wrote:
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
ROMs...
-tony
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! :-)