CO700115 REV. 2B with Piggyback RAM expansion.

[PhilC]

Well done, if it's one thing I've learned, it's when you start to get Ram problems on an old computer, it's usually a good idea to change the lot and then work out what still might work 😁

[rubber_jonnie]

Well done, if it's one thing I've learned, it's when you start to get Ram problems on an old computer, it's usually a good idea to change the lot and then work out what still might work 😁

I quite agree, and once I'd tweaked the PLCC socket pins for the MMU and GLUE, and the original memory was gone, booting up gave me a black screen with a white border, so a classic case of no RAM, meaning it looked like everything else was good to go. Just a case of dropping in a known good RAM expansion kit. I may yet install sockets and new de-coupling capacitors, and test with known good RAM to see if I can bring the thing back to life in a more original condition. Still thinking on that one, as it's a very early revision and seems to have no 68R resistors in the CAS/RAS lines, as they were added into the original piggyback RAM expansion.

[vondess]

I will update when I get a chance to give it the once over and power it up.

Anybody else think those wires look like telephone cable?

[DoG]

...Anybody else think those wires look like telephone cable?

It is standard color coding for cables. So it could be any cable really. But, yes, it certainly looks like it :)

1. white/blue
2. blue
3. white/orange
4. orange
5. white/green
6. green
7. white/brown
8. brown
9. white/slate (grey)
10. slate (grey)

[Maximilian]

Looks like network cable, not telephone cable :)