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T > TANDY RADIO SHACK  > TRS-80 Model 100 / 102     

Tandy Radio Shack
TRS-80 Model 100 / 102

The Tandy 100 was actually a computer made in Japan by Kyocera. All the ROM programs were written by Microsoft, and even a few of them were written by Bill Gates (!) himself ! These programs include a text editor, a telecommunication program, which uses the built-in modem (300 baud), and a rather good version of BASIC (no big surprise there).

Kyocera made this computer for three main companies: Tandy, Olivetti (Olivetti M10) and NEC (PC 8201), these computers are the same except the case and some little differences in the programs and a few physical differences.

The operating system uses 3130 bytes of the 8 KB RAM. So the 8 KB models (Catalog # 26-3801) didn’t sell very well. But there was also a 24 kb model (Catalog # 26-3802), and one year later, Tandy replaced the Tandy 100 with the Tandy 102 (which has 24 kb RAM too), and later with the Tandy 200 (1985).

The Tandy 102 is 1/2 inch thinner and one pound weight different. The "Date-Bug" (random changing of the calendar) is also repaired from the Model 100. But many people still prefer the feel of the Model 100 as there are also more 100-only accessories on the used market than compatible accessories...

The CMOS CPU (80c85) allows to use the Tandy 100 for 20 hours with only 4 AA batteries (5 days at 4 hours/day or 20 days at 1 hour/day)!! The model 100/102 is still considered and used as an excellent machine, mainly to type texts when you're on the move (you can transfer them to modern computers) and even to send and receive emails !

Fun fact : its CPU was also used on the Mars Pathfinder probe's Sojourner rover !

Special thanks to Charles Harris who donated us this computer !



In 1983, I was a journalist working for a news service in Atlanta when Radio Shack came out with the model 100. Since I was the bureau chief, I bought one for our staff (mostly me) to use.

It only had an 8-line monochrome screen and 16k memory, but the model 100 served me well until Tandy came out with the model 200 in about 1985. It had 32k memory and a 16-line screen (40 characters per line) with the screen on a hinged top that folded down over the keyboard like today''s laptops. The model 100 was more like today''s notebooks.

I would take the Model 100 (and later the 200) to meetings, write my story from the meeting site, find a phone, hook up my portable modem with an RS232 cable, and transmit my copy back to the modem on the office typesetting equipment. It sure beat calling the story in and dictating it by phone to a colleague. Plus, I could cover the news at night and have the story waiting in the office when I went to work the next mornning, and it was in the memory of the typesetting unit. What a technological revolution the Model 100 was for workikng journalists. I loved it.

I liked the model 200 so much that I bought one personally, and still have it in my closet. I even bought a Radio Shack printer and a floppy disc drive for storage of stories I had written, and still have the disc drive for it.

Both the model 100 and 200 were workhorse equipment for journalists in the 1980s. Glad to read about other journalists who loved this little machine. It changed my life.

$ Jim Newton, retired journalist, Clinton, Ms

Friday 17th December 2010
Jim Newton (USA)

I have a T100 now. the 3.6V memory battery has leak. I have to replace that as well as the contrast knob. It willl be fun getting it back up and working

Sunday 16th January 2011
Chulang Searales (Barbados West Indies)

I was cleaing out the closet and found my Model 100. I turned it on and it still works and ther date time was within an hour. I had forgot I still had it. I have had it since 1980. If the batteries weren''t dead in 10 years Maybe I should use this in stead of buying an iPad.

After seeing that otheres are still using their Model 100s I will learn how to live with only 24k of ram. I used to!
I think it is time to change tos internal NiCad batteries first. 30 years is a little long for them.

Thursday 24th June 2010
Marty (Woodstock, IL USA)


NAME  TRS-80 Model 100 / 102
MANUFACTURER  Tandy Radio Shack
TYPE  Home Computer
YEAR  1983
BUILT IN LANGUAGE  Enhanced version of Microsoft BASIC
KEYBOARD  Full-size typewriter style keyboard
8 function keys
CPU  Intel 80c85 (code and pin compatible with 8085)
RAM  8 kb, up to 32 KB (29638 bytes free)
by incremental 8 kb RAM pack on PCB
ROM  32 kb (up to 64 kb)
TEXT MODES  40 x 8 (LCD screen)
GRAPHIC MODES  240 x 64 (Full-Dot matrix)
COLORS  monochrome
SOUND  Beeper
SIZE / WEIGHT  30 (w) x 21.5 (D) x 4.5 (H) cm.
I/O PORTS  Centronics
Bar Code
System Bus
BUILT IN MEDIA  User RAM battery backup
POWER SUPPLY  6v DC - 1.1 w or 4 x AA alkaline-manganese batteries
Acoustic modem
PRICE  $799 - £499



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