I have a clean, and somewhat functional expansion interface that I just tested over the weekend. Without the EI connected, the model 1 reports ~16K RAM and with the EI the model 1 reports ~48K, so the RAM seems OK. But, the FD1771 IC, for some reason, was removed from an otherwise apparently functional EI. http://imgur.com/a/3NzOh
Is there any reason why this chip would be removed? I see a number of them on ebay for around $25. The expansion interface hardware manual indicates it is an FD1771B-01, but the service manual indicates a couple possibilities....FD1771 A/B -01 -11. Any considerations to look for here? Thanks, Win
