Looks great; it reminds me of my 22 slot S-100 backplane in the IMSAI 8080 I put together so many years ago. The differences are that the front panel took up one slot and that I had only a few slot connectors soldered.
Question: From where are you getting the extra cards (serial, disk, etc.)? I'm strongly considering getting an Altair kit, but am holding back because of the lack of I/O cards and the possibility that Grant might do an 8800b kit.
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On a totally different note, I found a small Canadian company that's selling a 6502 kit for CAN$159. It's a complete do-it-yourself using breadboard construction. There's no printed circuit board option nor is a fancy case available, but I suppose these could be made without too much trouble. Also, there's no front panel, but I suspect these could be done as well with an AVR microcontroller and a bunch of LEDs and latches.
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