Re: Lisa I/O board troubleshooting, and schematic weirdness

>I am using the 2/5's CPU board, so I have the correct firmware to
>work with the I/O board.

The 2/5 and 2/10 use the same CPU board and ROMs. Although there are a couple of revisions, they are essentially interchangeable (with the exception of the 3A screen modification kit ROMs which need a different CPU board video PROM).

The I/O board ROM differs according to the type of board and type of floppy.

>Now, the chip at 11E is NOT a WD2001. It's a 29LS32.

The I/O board for the 2/10 is different from the 2/5, so their schematics differ...

The 2/5 I/O board has the 29LS32 at 11E, and the empty 24 pin socket is labelled 9512; it has no WD2001. This might be labelled as a Lisa 1 I/O board.

There is a location for a 28 pin WD2001 on the 2/10 I/O board; it has no battery. If this is labelled as a Lisa 1 I/O board, that is an error... look for a different set of schematics.

The 9512 and WD2001 were simple math processors, which were never supported in software as far as I know.

>I get a couple of beeps and error 51 on the screen. Now, I know that
>this relates to the parallel port VIA, so I've already tried
>swapping it - no change.

Once you've dealt with the battery corrosion issue, a bad/dirty backplane/motherboard connection is often the cause of an I/O board self-test error, but I'd suspect the corrosion issue first.

Good luck!

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