Tandy Model 600
Owner: Larry Kollar
Location: Dawsonville, GA USA
Larry Kollar's Comments:
One can think of the 600 as a Model 100/200 on steroids... and
suffering from the side-effects. Improvements included:
- larger screen (80 x 16)
- higher memory capacity (32K standard, 224K maximum)
- built-in disk drive
- Microsoft Works (v1.02) in ROM
- Multiplan (a spreadsheet) in a snap-in ROM
Changes of dubious merit included:
- 80C88 processor
- NiCad battery pack (OK in itself, but buried inside the
Bad changes included:
- larger size (12" x 12" x 2.5") and weight
- major price hike ($1600-$2400 depending on RAM)
- BASIC was an extra-cost option
The 600 has a very similar feel to the 100/200 products. It
stores files in RAM and lets you open files by using the arrow
keys to select the file and pressing Return. Modem and printer
cables are interchangeable with the 100/200. However, the
increased size and price (and the untimely appearance of MS-DOS
laptops) made the 600 a flop in the marketplace. Approximately
20,000 to 25,000 units were manufactured, making the Tandy 600 a
rather rare machine.
Strangely enough, the Radio Shack store catalog lists several
accessories still available for the 600, including the BASIC chip
and a service manual/programmer's reference.
Microsoft Works made the 600 a more capable machine, in many
respects, over the Model 100/200. WORD replaced TEXT, and
provided support for margins, indents, and pagination (but not
for underline or bold). Works also included FILE (a database) and
CALENDAR (a scheduler and alarm clock).
Like the Model 100/200, the 600 has a built-in 300 bps modem,
but sports an improved version of TELCOM with XMODEM file
transfer and a partial VT52 compatibility mode. The RS-232 port
is easier to configure and supports data rates up to 19,200 bps
(practical maximum throughput is about 2400 bps).
The 600's TELCOM has a built-in mini-BBS program that lets
people dial in and upload or download files.
PLAN (Multiplan) came on a snap-in ROM chip. You can replace
PLAN with the optional BASIC chip, or (if you have expanded RAM)
copy one program or the other to RAM if you need both available.
The Tandy 600 BASIC is very similar to GW-BASIC, but with the
glaring omission of commands like INSTR, PEEK, POKE, and VARPTR.
However, you can extend the interpreter using library files. A
DBCALLS library for handling FILE (database) files was included
on a utility disk; some enterprising hackers created a UTILITY
library (with PEEK, POKE, and VARPTR) by modifying the
The Tandy 600 is my traveling companion and thunderstorm
computer. I bought it (serial number 51011265, manufactured Oct.
1985) for $40, after a fellow ham radio operator bought it at a
hamfest and learned that it wouldn't run MS-DOS. I had to replace
the NiCads and take care of a mis-aligned disk drive cable, now
it works quite well (especially when the light is strong enough
to make the LCD readable).
I created a Tandy 600 FAQ in December of 1996 and posted it to
comp.sys.tandy. Other owners responded with corrections and
additions, and now we have a Web page, an FTP site, and a mailing
list. Several people have expressed interest in creating new
software. The 600 lives!
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