That was an original I/O board, probably used in a Lisa 1. Part
of the upgrade involved replacing the I/O ROM and cutting two
resistors. The newer I/O boards didn't have these resistors to
begin with.
I have two I/O boards for my lisa. One is a spare incase the other
one dies. I was looking at the spare the other day and I noticed a
few strange things.
Two traces and a resistor have been cut. This cut resistor is not
actually present on my other board. The board with the cut traces
seems to work perfectly fine however. But I am curious, anyone know
why this has been done?
You can find a link to pictures her:
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