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January 2021, Week 2

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Subject:	Re: [EXT]: Hp 3000 series 30
From:	Frank McConnell <[log in to unmask]>
Reply To:	Frank McConnell <[log in to unmask]>
Date:	Thu, 14 Jan 2021 19:23:49 -0800
Content-Type:	text/plain
Parts/Attachments:	text/plain (12 lines)

On Jan 14, 2021, at 16:06, grant wrote:
> 
> Thanks Frank,The machine passes the pcu and ralu test before it fails, understanding the tests could lead to the solution to find the fault. If the rass is going out to the busses and logic at this test . With out understanding what is happening im going around in circles. I m at the point where I just need to test all the logic on the bic then the cpu chip by chip to find the fault. I could dump all the roms if that would intrest anyone.

Dumping ROMs would probably be good to do and may even come in handy.  I’ve never tried to reverse-engineer a micromachine from its microcode ROM dump but I think it’s been done.

I get the idea the RASS has a bunch of registers in it, some for its own use (address bounds tests) and some that can be fed to the ALU in the RALU chip.  Not sure how data flows between them though.

-Frank McConnell
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