I have created a version of CP/M 2.2 for the Altair that does not require a disk controller. Instead, disk transfers are done through the second port on an 88-2SIO serial interface board and disk images are served from a PC. The server on the PC is the same server program that works with the Altair FDC+ controller.
This CP/M is particularly well suited for use with Martin Eberhard’s 88-2SIOJP board since it supports baud rates as high as 76.8K. At this rate, performance is as good or better than original Altair versions of CP/M from Lifeboat and Burcon. An original 88-2SIO can run at 19.2K baud – and this works – but it does feel slower than a disk system.
https://deramp.com/downloads/altair/sof ... 20(88-2SIO)/
Mike D