|TRS-80 Model III|
WWW.8BIT-MICRO.COM ONLINE VINTAGE COMPUTER MAGAZINE
Parallel & RS232
X 64 text
drives, External hard drive
Operating System: TRS-DOS.
the Model I integrated into one
complete unit, with all the upgrade
features that Tandy added to the
Model I in their subsequent release. It is probably Tandy most popular personal / business
computer in the TRS-80 line. Although designed for the business market, the Model III
has to it's credit an impressive collection of games.
The Model III has a 16 x 64 character display using a CRT very similar to the RCA picture
tube from a 12" television. The starting unit came with 16K RAM, and two single sided
5.25" floppy drives. Tandy built the computer with a daughter connector on the main
board to upgrade the unit for hi-resolution graphics. Edge card connections were provided
for external floppy drives, and parallel printer. The serial port was optional.
A few clones were built based on the Model III which were very successful in the business
market. Tandy provided a version of TRS-DOS, but the superior operating systems were
LS-DOS by Logical Systems or NEW-DOS 80. Clones were produced by LNW Corporation,
Sanyo, MTI Corporation and Adcock & Johnson to name a few.
The above images from left to right are: (a) Model III Clone from MTI, (Microcomputer
Technology Inc.) These units hit the business market and could be seen in may video
store operations. Bundled as a canned solution for video rental, the MTI held until the
late 1980's. (b) The LNW-80 with a color composite monitor. This unit was prevalently
based on the CP/M operating system. The original was introduced as a TRS-80 Model I
clone, the specifications were a 4Mhz., Z80A CPU, with Hi-Rez color graphics of 480 x
192, and could support full 80 column display this unit was complete with dual 5.25'
double sided floppies. (c) LNW-80 with it's green phosphor 80 column display without the
5.25" floppy modification.
Images from top to bottom - Left to Right: TRS-80 Model III, MTI Modified Model III, LNW-
80 w/ Drive Option and the base LNW-80.
(c) 2004, 2005 Brian K. Hahn
All Rights Reserved.