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.

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

 

Our unit has a serial number of 70130012 and was very kindly donated by Andrew Grant-Adamson.

 

Thanks to www.old-computers.com for the information

TRS-80 Model 102 Portable Computer Manuals:

Item	Manufacturer	Date
TRS-80 Colour Graphic Printer Manual	Radio Shack	Unknown
TRS-80 RS-232-C Interface Manual	Radio Shack	1978
The Electric Pencil for TRS-80 Operator's Manual	Small System Software	1978
TRS-80 Model III Disk System Owner's Manual	Tandy	1980
Instructions for Converting Specified Model I Programs for use on TRS-80 Model III	Radio Shack	Aug 1980
TRS-80 Model I/III Series 1 Editor Assembler	Radio Shack	1981
Trackcess 3.0 "Access to Tracks"	The Alternate Source	1981
TRS-80 Model III Technical Reference Manual	Tandy	1981
TRS-80 Model 100 Portable Computer Owners Manual	Radio shack	1983
Tandy TRS-80 Model 100 Quick Reference Guide	Tandy	1983
TRS-80 Model 4/4P Disk System Owner's Manual	Tandy	1983
TRS-80 Model III Hard Disk System Start-up Manual	Tandy	1984

Magazines RELATED to TRS-80 Model 102 Portable Computer in our Library

Item	Manufacturer	Date
REM 80 - Volume 3, Issue 4	The North West TRS-80 USers Group	Unknown
REM 80 - Volume 4, Issue 2	The North West TRS-80 USers Group	Unknown
REM 80 - Volume 4, Issue 4	The North West TRS-80 Users Group	Unknown
REM 80 - Volume 5, Issue 2	The North West TRS-80 Users Group	Unknown
REM 80 - Volume 5, Issue 3	The North West TRS-80 Users Group	Unknown
REM 80 - Volume 5, Issue 4	The North West TRS-80 Users Group	Unknown
REM 80 - Volume 7, Issue 1	The North West TRS-80 Users Group	Unknown
REM 80 - Volume 6, Issue 5	The North West TRS-80 Users Group	Unknown
REM 80 - Volume 8, Issue 4	The North West TRS-80 Users Group	Unknown
REM 80 - Volume 9, Issue 4/5	The North West TRS-80 Users Group	Unknown
REM 80 - Volume 8, Issue 3	The North West TRS-80 Users Group	Unknown
REM 80 - Volume 11, Issue 1	The North West TRS-80 USers Group	Unknown
REM 80 - Volume 6, Issue 1	The North West TRS-80 Users Group	Unknown
REM 80 - Volume 7, Issue 4	The North West TRS-80 Users Group	Unknown
REM 80 - Volume 9, Issue 6	The North West TRS-80 Users Group	Unknown
REM 80 - Volume 6, Issue 3	The North West TRS-80 Users Group	Unknown
REM 80 - Volume 9, Issue 1	The North West TRS-80 Users Group	Unknown
REM 80 - Volume 9, Issue 2	The North West TRS-80 USers Group	Unknown
Popular Electronics - October 1977		Oct 1977
Personal Computer World - August 1978		Aug 1978
Personal Computer World - September 1978		Sep 1978
Personal Computer World - October 1978		Oct 1978
Practical Computing - October 1978	ECC	Oct 1978
Practical Computing - November 1978	ECC	Nov 1978
Practical Computing - December 1978	ECC	Dec 1978
TRS-80 Computing - Volume 1, Number 1	Computer Information Exchange Inc.	1979
Practical Computing - July 1979	ECC	Jul 1979
Practical Computing - August 1979	ECC	Aug 1979
Practical Computing - September 1979	ECC	Sep 1979
Practical Computing - November 1979	IPC Electrical Electronic Press	Nov 1979
Practical Computing - January 1980	IPC Electrical Electronic Press	Jan 1980
Practical Computing - April 1980, Volume 3, Issue 4	IPC Electrical Electronic Press	Apr 1980
Personal Computer World - June 1980		Jun 1980
REM 80 - Volume 3, Issue 1	The North West TRS-80 USers Group	1981
REM 80 - Volume 3, Issue 3	The North West TRS-80 USers Group	1981
Personal Computer World - July 1981		Jul 1981
Personal Computer World - September 1981		Sep 1981
Your Computer - December 1981		Dec 1981
TRS-80 Microcomputer News Volume 1 Number 1	Radio Shack - Tandy	Jan 1982
TRS-80 Microcomputer News - Volume 1, Number 2	Radio Shack - Tandy	Feb 1982
Personal Computer World - May 1982		May 1982
Personal Computer World - December 1982		Dec 1982
REM 80 - Volume 5, Issue 5	The North West TRS-80 Users Group	1983
REM 80 - Volume 5, Issue 6	The North West TRS-80 Users Group	1983
REM 80 - Volume 6, Issue 2	The North West TRS-80 Users Group	1983
Personal Computer World - August 1983		Aug 1983
TRS-80 Microcomputer News October 1983		Oct 1983
Practical Computing - October 1983		Oct 1983
Call-A.P.P.L.E. - November 1983		Nov 1983
REM 80 - Volume 7, Issue 2	The North West TRS-80 Users Group	1984
REM 80 - Volume 6, Issue 4	The North West TRS-80 Users Group	1984
Personal Computer World - February 1984		Feb 1984
The War Machine Issue No. 25 - March/April 1984		Mar 1984
Personal Computer World - May 1984		May 1984
Byte May 1984		May 1984
Personal Computer World - August 1984		Aug 1984
Byte March 1984		Oct 1984
REM 80 - Volume 7, Issue 5	The North West TRS-80 Users Group	1985
REM 80 - Volume 8, Issue 1/2	The North West TRS-80 Users Group	1986

Catalogues RELATED to TRS-80 Model 102 Portable Computer in our Library

Item	Manufacturer	Date
TRS-80 Applications Software Sourcebook Volume 2		Unknown
TRS-80 Applications Software Sourcebook Volume 3		1981
TRS-80 and Genie Software	Molimerx Ltd	1982

Other Systems Related To TRS-80 Model 102 Portable Computer:

Item	Manufacturer	Date
Tandy 102 Portable Computer	Tandy Radio Shack	1983
TRS-80 Model 100 Portable Computer	Tandy Radio Shack	April 1983
Tandy 1100FD Laptop Computer	Tandy Radio Shack	November 1989