> Yes, it is indeed labelled underneath as an Issue 5 circuit board, > so I wonder how many other variants there are of this issue???
To be sure what generation of a QL it is can you please post the serial-number (eg Dxx-yyyyyy). Another information which would help can be found on top left of the component side of the PCB (above the expansion-slot and left of the ROM-port). On early issue 5 PCBs theres a date in ink like 84xx. I have a D05-QL which has 8415 there which means the board was produce in April 1984. A third (not really safe) method I use is to check every IC and other components for production date like 84xx or 83xx. If it holds a soldered component with date eg 8427 it was produced or repaired after July 1984. All that can end in an endless story ;-) Have a good day...Urs
