Self-test error codes

["BLuRry" <brendan.robert@gmail.com>]

I have a //e enhanced, with a very damaged 8mhz zip chip processor.  I
plan to replace the zip chip with an unmodified 65C02 processor.
Before I do, I wanted to make sure the self-test code wasn't revealing
something else as a problem as well.

After running the self test, I see the following on the screen:

RAM: 0 0 0 0 0 0 0 1

Would this indicate the last ram chip is damaged, or that the processor
is just having trouble reading from that memory line due to a damaged
pin?

Should I be too nervous about putting in a 65C02 processor that's
faster than 1mhz?  (or is that kept in check by the on-board osc?)

A side topic of lesser importance: Would it be possible to gut the
parts of the zip chip and make a daughter-card (to plug in to the 6502
socket) housing all the parts of the zip chip?  Does anyone have a
schematic for such a thing, but some random chance?  :-)

Thanks folks!

-BLuRry