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.


On 3/11/06, Philip Lord <lord_philip@mac.com> wrote:

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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