Re: Troubleshooting X/Lisa RAM boards - first draft

>Board 1:
>00000186 0000 0000 0000 0000 1000 0800 0060 0100
>
>Board 2:
>00000186 0000 0000 0000 0000 00FF 00FF 00FF 00FF
>
>Board 3:
>00000186 0000 0000 0000 0000 0000 0000 0000 2000
>
>I moved the board to slot 2, and tried again. Obviously, the data in
>location $186 is different, it now reads:
>00000186 2000 0000 0000 0000 0000 0000 0000 0000

In the first three cases, did you have a good board in MEM 1?

If not, then it suggests the rule of thumb may be incorrect or incomplete.

I wonder if it depends on the ROM version... which CPU ROM rev were you using? (The ROM revisions are shown in the top right corner -- at the right end of the menubar, in the form "cpu/io"). I used rev H.

Another (unlikely) possibility is that your boards are not 512K... do they have a bunch of wires added to them? If so, they (might) have been modified to be 2MB boards.

I'd guess that board 3 has a problem at chip E6 or B6, but I'm confused about the two/one board factor. Are you calling the slot closest to the CPU board slot 1?

It's great to have more data!

James

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