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

This image is pre-configured for a Sol-20 computer with 48K of RAM. A customized MOVCPM is included to size CP/M for different amounts of RAM (run MOVCPM followed by SYSGEN).

The disk image files, SOLGAMES1-SDC.NSI and SOLGAMES2-SDC.NSI are bootable CP/M 2.2 disks that contain numerous original Sol-20 games with a built-in CP/M loader so they can be launched from the CP/M command line.