12 Sep
2010
12 Sep
'10
1:52 p.m.
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.
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/
If you're interested let me know off-list
-Rik
12 Sep
12 Sep
3:16 p.m.
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
4:19 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
13 Sep
13 Sep
5:02 p.m.
Tony,
The rom board replaces the system rom's not the rom modules from the
drawers.
Oh, right...
It's a small pcb that will be placed as a
piggyback on the PPU board.
Dn't you mean on the ROM/RAM board? And I assume you'd need 2 boards (PPU
ROMs and LPU ROMs) for a complete machine.
Actually, I doubt I'd be interested at the momnet. My ROMs are
fortunately OK for the time being. And to be honest, wiring up a
kludgeboard on stripboard isnt' that hard.
-tony
12 Sep
12 Sep
9:35 p.m.
More info on the project at :
http://www.hp9845.net/9845/projects/romboard/
If you're interested let me know off-list
Rik, may I suggest some mods on this project?
- why not SMD chips?
- The board can be made WAY smaller (and cheaper)!!!
- If you use only one socket and 8 wires to the cs2 socket, you could
make it EVEN smaller!
- There are 16 bit memories on the market for cheap. Even SMD ones. Why
not?
I think there is an easier way of doing that board :)
13 Sep
13 Sep
11:29 a.m.
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
Namens Alexandre Souza - Listas
Verzonden: maandag 13 september 2010 3:35
Aan: General Discussion: On-Topic and Off-Topic Posts
Onderwerp: Re: HP 9845 replacement ROM boards
More info on the project at :
http://www.hp9845.net/9845/projects/romboard/
If you're interested let me know off-list
Rik, may I suggest some mods on this project?
- why not SMD chips?
- The board can be made WAY smaller (and cheaper)!!!
- If you use only one socket and 8 wires to the cs2 socket, you could
make it EVEN smaller!
- There are 16 bit memories on the market for cheap. Even SMD ones. Why
not?
I think there is an easier way of doing that board :)
It looks you're right about resizing the board.
Does this means you're volunteering to do it ? ;-P
-Rik
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