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 The CP/M BIOS is configured to operate with one or two MITS 88-2SIO cards addressed at the standard MITS addresses of decimal 16, 18 for the first card and 20, 22 for the second card. APE makes use of the first card’s second port, decimal 18. Using CP/M Devices that reference this port may result in unpredictable behavior – you have been warned. 88-2SIO | Port | Decimal Port | CP/M Devices used with STAT | First Card (Required) | 1 | 16 | CRT:, UR2:, UP2:, LPT: | First Card (Required) | 2 | 18 | UC1:, UR1:, UP1:, UL1: Port used by APE, should not be used from CP/M | Second Card (Optional) | 1 | 20 | TTY: | Second Card (Optional) | 2 | 22 | PTR:, PTP: |
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