Made good progress with the PET; after fixing the video I got the reset circuit humming again (a bad ceramic cap on the 555 trigger circuit) and it fired right up after that, much to my surprise. And only 4 of the 18 6550 RAMs are bad :). Replaced a few terrible sockets and it's running reliably, albeit with only 6K of RAM. The keyboard on this thing has suffered some abuse; the "-" keycap on the numeric keypad has been broken off. I figure it's a long shot, but does anyone happen to have a spare "parts" quality keyboard they'd be willing to sacrifice a "-" key from? Thanks, Josh