I meant to post this Tuesday, but things got busy. My IMSAI is up with the front panel, CPU and memory card. I can now reliably do all front panel operations and can toggle in and run short programs on either the 8K SRAM or 64K DRAM card (only one in the box at a time). For those keeping score: Replaced all chips on the front panel. All are now socketed. Replaced two switches on the front panel. Routed several traces around burned or otherwise damaged spots on the front panel. And... (this is the kicker) Re-patched the MWRITE circuit. The original (and incorrect) patch brought the SOUT signal to U25 pin 5. What was actually required at U25 pin 5 was NOT-SOUT. So next, I suppose, is to get the MIO working (at least the serial port) so I can get a terminal on this baby. If anybody has MIO REV.2 schematics, it might make my life easier. To begin with, all the chips on this card are socketed. It is a very neatly and carefully done soldering job. The following chips are missing: U8, U11, U30 and U34. I can see the silkscreens for U30 (74LS32) and U34 (8T20), but the sockets hide the silkscreens for U8 and U11. Does the absence of these chips simply indicate that one of the functions of this board is disabled? Thanks, Bill Sudbrink