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The [[ECB Bus]] is a (more or less) standarized bus for Z80 and 8080 computers; similar to the ISA bus used on 80x86 computers. In theory, ECB cards could be used with different computers - however, in practice, different computer systems have different memory and I/O maps, so one would need to modify the memory and I/O address decoding (on the ECB cards) in order to get them working on other computers. Another problem is that some pins aren't standarized, and various companies have assigned different signals to them, including for -5V and -12V supplies (which may blow-up other cards that don't expect negative voltages on those pins).