The file, "CPM22b14-48K-SDC-ALTAIR.NSI" is CP/M 2.2b ver 1.4 for the North Star single density controller. 

This image is pre-configured for an Altair computer with 48K of RAM and an 88-2SIO serial board. A customized MOVCPM is included to size CP/M for different amounts of RAM (run MOVCPM followed by SYSGEN).

Full IOBYTE support is provided as follows:

CON device (bits 1,0):
   00 - TTY uses 2SIO serial port A*
   01 - CRT uses 2SIO serial port B
   10 - BAT indirect through RDR logical device
   11 - UC1 uses 2SIO serial port A

RDR device (bits 3,2):
   00 - TTY uses 2SIO serial port A
   01 - PTR uses 2SIO serial port B*
   10 - UR1 uses 2SIO serial port A
   11 - UR2 uses 2SIO serial port B

PUN device (bits 5,4):
   00 - TTY uses 2SIO serial port A
   01 - PTP uses 2SIO serial port B*
   10 - UP1 uses 2SIO serial port A
   11 - UP2 uses 2SIO serial port B
 
LST device bits (7,6):
   00 - TTY uses 2SIO serial port A
   01 - CRT uses 2SIO serial port B
   10 - LPT uses 2SIO serial port B*
   11 - UL1 uses 2SIO serial port A

* Default setting