12 Sep
2010
12 Sep
'10
1:19 p.m.
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
Namens Tony Duell
Verzonden: zondag 12 september 2010 21:17
Aan: cctalk at classiccmp.org
Onderwerp: Re: HP 9845 replacement ROM boards
The rom's on my HP 9845B are getting unstable when the machine is
heating up, they're giving errors.
Ansgar Kueckes from <http://www.hp9845.net> www.hp9845.net has a very
nice solution, the design for a replacement board using flash memory.
Is this a replacement for a ROM module (the SIM-like thing that goes into
the ROM drawer), the ROM drawer PCB, an internal HP845 PCB, or what?
The first would be the best IMHO in that it keeps the machine as original as
possible, It's known that some 3rd party ROM modules for the 9845 didn't use
the HP hybrid circuits, they used normal DIL ICs on a little PCB. There is
just enough space for a 0.6" wide package...
It includes the pcb desing, I asked him permission to
use his design
and produce a certain amount of PCB's and to sell them for cost price
to other collectors. He agreed, the more I order the cheaper the price
will be, so who wants a PCB for his HP 9845 ?
More info on the project at :
http://www.hp9845.net/9845/projects/romboard/
I will take a look. I am not in a position to spend much money at the
moment, but depending on the final price I might be interested.
-tony
Tony,
The rom board replaces the system rom's not the rom modules from the
drawers.
It's a small pcb that will be placed as a piggyback on the PPU board.
Price will depend on the ordered amount and the delivery time (because there
is no hurry I will go for 15 days .)
-Rik