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

This image is pre-configured for an IMSAI computer with 48K of RAM and a SIO-2 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 SIO 2 serial port A*
   01 - CRT uses SIO 2 serial port B
   10 - BAT indirect through RDR logical device
   11 - UC1 uses SIO 2 serial port A

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

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

* Default setting