Hi David,
Normally core is very trustworthy. Several others of my PDP8 and 11 machines run on core too... Once I have repaired the core module in my PDP8/L. That machine was in a very bad shape. (This machine was used for satellite navigation with the
Transit satellite navigation system)
Many of the 512 diodes on the core stack were shorted. After replacing the shorted ones the machine worked for a little while and stopped again. (
here you can see what happened) The memory contents became corrupt and the machine stopped working again. So I replaced all 512 diodes on the core stack and it still works fine. (The core stack was not the only problem, many other diodes and TTL chips were bad too...
See restoration story on vcfed)
Now I have to fix one of my Teletypes and run Fortran on it. Where can I buy a box full off spare time?
Regards, Roland