Posts in the “Hardware” Category - page 4

TRS‑80 Digitizer

The TRS‑80 Digitizer (catalog number 26-1195), available in November 1981, provided a way to digitize maps, blueprints, and charts in an era before document scanners were affordable or commonly available. The Digitizer, which measured 2¼″ by 15½″ by 4¼″, cost $449.00 and connected to the TRS‑80 Model I or Color Computer through the cassette port or to other TRS‑80 models through the RS-232 port. (Oddly, the Model III couldn’t be connected through the cassette port like the Model I.

The Network 3 Controller

The Radio Shack Network 3 Controller (catalog number 26-1212) was a networking system designed for use in classrooms. First appearing in the 1983 catalog, the Network 3 Controller cost $599.00. Unlike the earlier Network I and Network 2 Controllers, which worked with more than one type of TRS‑80 computer, the Network 3 Controller only supported the Model III or Model 4 in Model III mode.

PT-210 Portable Data Terminal

The TRS‑80 PT-210 Portable Terminal (catalog number 76-1001) was a mobile dumb terminal that provided a way for travelers to access remote computers while on the road. Introduced by Radio Shack in late 1982 for a price of $995.00, the PT-210 was promoted with the slogan “Now there’s a TRS‑80 you can take with you on business trips!”

The PT-210 weighed 15 pounds and came in a briefcase-style case.

The Network I Controller

The Radio Shack Network I Controller (catalog number 26-1210) was an early networking system for the TRS‑80. Introduced on March 1, 1980, the Network I Controller (originally called the TRS‑80 Model I Network I) cost $499.00 and was primarily designed for classroom use.

The Model III to 4 Upgrade Kit

The TRS‑80 Model 4, introduced in 1983, was 100% software compatible with its predecessor, the TRS‑80 Model III. A cassette-based Model 4 behaved identically to a cassette-based Model III and could run all Model III software. But a disk-based Model 4 could also run new Model 4 software that exposed features unique to the Model 4, such as extra memory and a larger text resolution.

Mayday Uninterruptable Power Supplies

Mayday was a line of uninterruptible power supplies for the TRS‑80 and other computers. It was sold by Sun Research (originally Sun Technology), a division of Phase-R Corporation.

Phase-R Corporation was located in New Durham, New Hampshire and experienced frequent problems with poor power quality and frequent outages. They originally developed the Mayday to protect the office TRS‑80’s, describing it as “designed and developed using a complete TRS‑80 system.

Echo-80 Speech Synthesizer

Street Electronics Corporation sold a variety of speech synthesizers with the Echo name. The Echo II, the Apple II version, was the most popular, but they also sold versions for other computers.

TC-8 Cassette System

The TC-8 Cassette System was a hardware add-on from JPC Products that provided faster and more reliable cassette storage for the TRS‑80 Model I. Advertised as “The Poor Man’s Floppy”, the TC-8 provided features similar in many ways to the Exatron Stringy Floppy. The TC-8 could store up to 300K on an single 30 minute cassette tape. It increased the standard TRS‑80 cassette data rate from 500 baud to nearly 3000 baud.


The E/RAM was a high-resolution add-on for the TRS‑80 Model I. Introduced in 1980 for a price of $349.95, the E/RAM was designed and manufactured by Keyline Computer Products from Tulsa, Oklahoma. It was sold by Vern Street Products, also in Tulsa.

The E/RAM (an acronym for Extended Random Access Memory) contained 6K of video memory. It increased the TRS‑80 graphics resolution to 256 by 192, with the high-resolution graphics overlaying the text screen.

The SubLOGIC 50/T80

The SubLOGIC 50/T80 was a high-resolution add-on for the TRS‑80 Model I. It was created by SubLOGIC, a company better known to TRS‑80 users for their T80-FS1 Flight Simulator.

Here is the text of the 1980 product introduction:

The SubLOGIC 50/T80 system is a high performance professional graphics display system designed to be used directly with the TRS‑80.