Troubleshooting Superbrains

[Jules Richardson]

Gordon JC Pearce wrote:
> The keyboard problem on the other one is a bit odd - not all the keys
> work (haven't worked out the pattern but it *seems* like the outer three
> on the ends of each row work, the middle ones being dead), and the key
> repeat starts instantly.  I'm a tad concerned that this is a sign of a
> dying keyboard controller chip

Give it a good clean out with IPA first; generally I've seen some really 
strange keyboard behaviour on micros when some of the switches start getting 
tired and the contacts are dirty.

I did have my hands on a (bad) photocopy of the Superbrain schematics, but I'm 
afraid I really couldn't lay my hands on them for you right now :(

One thing I found was that the cases on the machines really don't age well - 
if you've got ones that are cosmetically nice, look after 'em!