Evening all (at least where I am)
I have received several Rev 4 motherboards inside II+ machines in the past few months. The other three I have (one went to Transwarp guy) had the 'Rev 4' under the slot and the 820-0001-04 under the CPU and a 1978 Date silkscreened on the PCB by the CPU and a motherboard Date of 794x and the Memory Select Blocks were soldered.
The machine I just got (S/N in the 7k range) has all the same markings, what looks like a 7940 mobo date (the 79 is very hard to see) but the Memory Select blocks are socketed not soldered.
Everything on this motherboard scream Rev 4 but I have never had a Rev 4 with sockets for the Memory Select Blocks. This a common thing or perhaps a modification/repair?
Just curious since I have had several other boards from the same era with the same markings (thanks to you guys teaching me what was what!) and this one is different in that one respect.
I was under the (apparently wrong) impression that Rev. 3 boards were the last to have sockets for the Mem Select blocks and Rev 4 was soldered and they disappeared entirely after that.
I will get pictures up shortly, came in to post this and get photos and the wife informed me my dinner is getting cold!