Re: Troubleshooting X/Lisa RAM boards - first draft

Hi James,

Yes, that agrees with my result.

A FAQ based on this memory error interpretation will be a great boon to Lisa owners trying to fix their machines. Can I suggest you incorporate the Word Bit# = Column table into the FAQ too. That was really helpful

Thanks so much!

Terry

• Original Message ----- From: "James MacPhail" <gg__at_email.domain.hidden> To: <lisalist_at_email.domain.hidden> Sent: Sunday, March 27, 2011 1:34 PM Subject: Re: Troubleshooting X/Lisa RAM boards - first draft

>
> With your data and Ian's it does appear that for the two board case, the
> words are in the order of MEM 2 then MEM 1, and I also had the row order
> backwards... swapping both of those, I think the pattern now agrees with
> your data, Ian's data (and enough of my data to make the exceptions
> suspect... due to my excitement I probably wrote down the wrong slot for a
> couple of the tests).
>
> So with two boards, do you agree we have:
>
> 1 Board in MEM 2
> E D C B X X X X
>
> 1 Board in MEM 1
> B C D E X X X X
>
> 2 boards
> - MEM 2 MEM 1
> - E D C B B C D E
>
> This would indicate Ian's board #3 needs a new chip at E6.
>
> I think we have progress! Many thanks for your contribution of time and
> data.
>
> James
>
>>With the second board, I piggybacked a good 4164 over B2, which seemed to
>>a
>>suspect according to the data below (the other suspect being E2).
>>
>>The board passed the memory test! The problem on the second board has now
>>been identified!
>>
>>James says in the draft....
>>>If you have two 512K memory boards, the first 4 words are associated with
>>>slot MEM 1, and the next 4 words are associated with slot MEM 2.
>>
>>James, at least with my data it seems like the reverse of this. With two
>>boards fitted the first 4 words are associated with MEM 2 and the next
>>with
>>MEM 1, yes?
>>
>>Just to be clear on my backplane, MEM 2 slot is the one at the end,
>>furtherest away from the CPU card (it's marked 2).
>
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