HP9825 internal ROM?

Chris Zach cz at alembic.crystel.com
Wed May 4 17:58:33 CDT 2022

Hi Paul!

Ok, so it should be coming up, but is not....

Hm. Without another unit to do comparisons with and a system that is not 
doing anything repeatable, trying to fix this little guy is probably 
outside my limit of "I have a limited amount of time in my life".

I think I'll stick it on the Evil Bay and reserve the logic analysis on 
the DEC stuff I have.

At least the power supply is fine so whatever is a dud isn't that...

Thank you!

On 5/4/2022 5:14 PM, Paul Berger via cctalk wrote:
> The 9825B should have a board part number 09825-66524 with 16 DRAM chips 
> and 10 24 pin ROM chips these ROM chips replace teh OS ROM module pluged 
> into the right bottom of the machine and also most of the option ROMs. 
> You may also have a second board with another 16 DRAMs a a lot of other 
> logic that is the memory expansion.
> Paul.

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