>> Note that Cromemco ZPUZ does not support 16 bit port addressing (or > 64K RAM) , be
>> sure all your boards have 8 bit only Ports.
Hmmm .... the CompuPro CPUZ card that Thomas is using does support extended addressing via the S-100 bus A16 --- A23 lines. The documentation *claims* that up to 16 MBs can be accessed via bank select, although I've never tried it, nor do I know if it works. The extended address signals are driven via I/O port address 0FDh, I think.
I know this because I'm using a similar configuration as Thomas, and am having trouble not with a ZFDC (haven't gotten that far yet!), but with the dual IDE card. Problem to be described in a follow-up post.