Josh, don't do this. There are some older S-100 boards which use the upper 8 Bit for decoding the I/O addresses (e.g. the MITS TurnKey board). For me it works fine with the 8080 CPU board, but when i switch to the Z80 board, it doesn't work anymore. It required some changes, to leave the TurnKey board in its original state by getting it to work with the lower 8 Bits. http://www.vintage-computer.com/vcforum/showthread.php?36878-Altair-8800b-T-Turnkey-board
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