Charley's Comms ROM
Charley's Comms ROM was an unfinished communications package by ChaRleyTroniC, intended to be installed on ROM.
Unusually for the time, it could communicate reliably at speeds of over 2400 baud, and supported file transfer protocols such as XModem-1k and YModem. Versions were developed for both the KDS and Amstrad/Pace serial interfaces. Like comparable programs such as Commstar, there was both a menu-driven terminal mode and a set of RSXs for the programmer to use.
The program was never completed, but the source code is available on the ChaRleyTroniC Source Code Collection disc.