John,I don't know what an Aztec card is, but the PCPI card is superior to the MicroSoft card. How so?
6 mhz vs 2 mhz 64K of RAM vs 0KThe ability to have it's own serial connection with higher speed Z-80 family parts. Finally, the ability to expand to 128K of RAM (if only I could learn how to add that on....)
Both cards have the Apple and it's 6502 doing some of the work, like interfacing with the keyboard, disk drives, etc.
I suggest you check http://www.blkbox.com/~jdbaker/SmallSys/AppliCard.html for additional information. Roy John wrote:
1) something to use for a2 interfacing. Does anyone have some broken AII cards they like to send? I want to experiment and I mostly need all the traces which connect to the socket the card would sit in. Or, those proto type boards. 2) Regarding CPM cards. Are there significant advantages, disadvantages to say a Microsoft CPM card vs Aztec? Do these cards generally need special software to run them? (There is one on ebay but there isn't any software (Aztec or something).) Then, does the CPM floppy just go in the A2 disk drive?