Hey all, just picked up this II+ and it is the earliest revision II+ I have ever had. Serial #4068.
It appears to me it is a Rev 3 board based on the photos (see attachments) and the research I have done, including this site and others.
Am I correct that this is a Rev 3 board? The II+'s brother came with it (S/N 7715) and it has the same date code on the mobo (33rd week of 1979) but I have not yet dismantled it to inspect further (still playing with his older brother 4068!!)
Alas the ram IC that was in the socket where the language card plugs in was not with the machine. While I have not inspected every chip yet, minus the Applesoft ROMs many of the chips I glanced at (including the CPU) are original as the date codes are all 1979. I'm sure there may be some that were replaced, I have not as I said removed, inspected and replaced every chip yet as I just got the machines last night.
Any thoughts on the mobo revision and any other items would be appreciated. The PSU is one of the dual voltage ones I have seen before (and have a few) that does 115v and 230v with a switch on the back of the PSU (sorry, did not photograph that yet)
It was in fantastic shape when I took it out of the box, needing minimal cleaning so far (still cleaning the case, which is also in very good to excellent shape)
I'll likely replace the ROMs with older, age appropriate date coded ones if I have them (which I believe I do)
Is it possible this would have come with Integer ROMs and then been switched out? I did not think a II+ would have come with anything but Applesoft ROMs but I have no experience with ones this old. Late 1979 seems unlikely to have been anything but Applesoft installed. Just that with several of the ROMs with datecodes into the 80's I was unsure how this may have been originally outfitted.
My favorite part is the character ROM, which matches the ram nicely. I love playing with these old machines, especially now that I can take them apart and mess with their innards, something I would never dare due as a child since it was Mom and Dad's $$ that paid for them back then!!