The source material about the LS-100 RAM disk board was compiled by: Rob's Retro Computing Archive (RCL9) RetroComputingArchive@gmail.com https://github.com/rcl9 RCL9 purchased and built the kit in July 1984 for CDN$182. He was able to (finally) retrieve the original SSSD 8" LS-100 distribution diskette in Feburary 2026 as well as scan the original documentation and schematics. He is also providing his own custom CP/M 2.2 CBIOS into which he had added LS-100 support. The S-100 board acted as a very fast CP/M disk drive with a capacity of 256K. It utilized the Intel 8203-1 Dynamic RAM refresh controller and so was quite reliable. It was also IEEE-696 compliant. All operations went through 4 I/O ports which were switch configurable. The board came with some basic software to get it going under CP/M. Up to 8 boards could be configured in a S-100 system.