I have used this forum over many years to help me restore my Apple II Europlus (UK model). The machine has been fully working for many years, but recently I decided to try and fix up some un-serviceable Drive II's using the detailed diagnostics from Speedy G. I suspect it is pure coincidence, but after running tests on one drive, the machine threw an error along the lines of:
EE00- A=DA X=F4 Y=04 P=39 S=E0
The machine now runs for a few seconds or a few hours, but the error (though the values change each time) always comes. I have always been careful with my connecting / disconnecting protocol with drives and cards.
- Run various diagnostics software within my library and it always passes the tests of memory, cards, etc.
- Tested the voltage outputs on the power supply (it was rebuilt in the past), they are all within tolerances.
- Reseated chips and removed all cards (it currently has disk controller card, super serial card, and language card fitted).
- The machine received a full set of NOS 4116 chips back in 2011 when I first restored it, as all the Apple ones were fried. I wonder if the problem is a legacy of its past.
I noticed that sometimes, the IC chips (all of them) seem a little hotter than usual, but they stabilise around 27'celcius (all at the same temperature).
Any suggestions gratefully received of how to proceed:
Thank you, Paul