Posts tagged with “Roy Soltoff”

The MISOSYS Quarterly

The MISOSYS Quarterly, better known as TMQ, was the official newsletter for MISOSYS, a software company based in Sterling, Virginia. It was published by Roy Soltoff, the “system designer of TRSDOS 6.0” and co-founder of Logical Systems (the creators of LDOS and LS‑DOS). The MISOSYS Quarterly was far more than just a company newsletter, and was one of the best technical resources for the TRS‑80 Model III and Model 4.

The MISOSYS Hard Drive Kit

The MISOSYS Hard Drive Kit was a hard drive interface for the TRS‑80 Model III, Model 4, and Lobo MAX‑80. (There was no version for the TRS‑80 Model I.) It was announced in the Spring/Summer 1989 issue of The MISOSYS Quarterly and began shipping in September 1989. It came in in two configurations: 20 MB and 40 MB.

Although Roy Soltoff described the MISOSYS Hard Drive Kit as a “pre-assembled kit,” it came fully assembled, tested, and ready to connect to the TRS‑80.


PRO-WAM (also known as PRO-NTO) is a collection of pop-up tools for LS‑DOS/TRSDOS 6 on the TRS‑80 Model 4. It was written by Karl Hessinger and Roy Soltoff and cost $59.95 when it was introduced in December 1984.

PRO-WAM was one of the few programs to require a Model 4 expanded to a full 128K of memory. In my opinion, it was one of the best uses of the extra memory and one of my favorite Model 4 utilities.

The Lobo LX‑80 Expansion Interface

The LX‑80 was an alternative to the Radio Shack Expansion Interface that took a different approach to compatibility than the competition. It was originally announced by Lobo Drives International in Fall of 1979, but problems with the supplied operating system meant that it wasn’t released until closer to 1981. The original price was $799 (without memory), although that price had been reduced to $510 by late 1982.


DoubleDuty is a utility that uses the full 128K of a TRS‑80 Model 4 to allow more than one program to be run at one time. Introduced by Radio Shack in 1984, DoubleDuty was written by Randy Cook, the author of Model I TRSDOS and VTOS.
DoubleDuty works by creating three sections, called partitions, out of the Model 4 memory. Partitions one and two each contain a complete Model 4 TRSDOS system. The third partition is reserved for running TRSDOS library commands.

The Programmer’s Guide To LDOS/TRSDOS Version 6

The Programmer’s Guide is my favorite TRS‑80 programming book, and in my opinion, the most useful.