Posts tagged with “Computer Applications Unlimited”


M-ZAL was a powerful disk-based editor assembler system for the TRS‑80 Model I and III. First introduced in 1981, M-ZAL (which stood for Modular Z80 Assembly Language) was written by Jeffrey Krantz and David Willen. It was sold by Computer Applications Unlimited (also known as CUA) for the price of $149.95.

Although expensive, M‑ZAL was one of the most advanced assemblers ever written for the TRS‑80 and it was used by many professional TRS‑80 developers.