Here's a rather blurry picture of my first cut backplane. The system bus is fed along the IDC cables each card mates using a 64 way eurocard connector.
The board plugged in is the memory board which I built in 2007. I've still not tested the board yet other than to check that the supplies go to the correct pins on each chip!
The memory board has only 32k RAM fitted but the design allows for 48k RAM. The empty IC holder is for the 256k Flash ROM which can be paged into the top 16k of memory space and into the bottom 8k after a hard reset.
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