• Source: TRS-80 Model 100

The TRS-80 Model 100 is a notebook-sized portable computer introduced in April 1983.
It was the first commercially successful notebook computer, known as laptops today, as well as one of the first notebook computers ever released.
It featured a keyboard and liquid-crystal display, in a battery-powered package roughly the size and shape of a 1" 3 ring binder.
The 224-page, spiral-bound User Manual is nearly the same size as the computer itself and adds to the value of the Model 100, particularly if it still has the pouch in good condition that was included to help protect the manual from damage during the owner's travels.
The Model 100 was made by Kyocera, and originally sold in Japan as the Kyotronic 85.
Although a slow seller for Kyocera in Japan, the rights to the machine were purchased by Tandy Corporation and was wildly popular.
This popularity was further boosted by there even being a monthly Model 100 magazine that shared stories of people that owned them, including astronauts aboard the NASA Space Shuttles, and always included program code listed that was submitted by subscribers to the magazine.
The Model 100 was sold through Radio Shack stores in the United States and Canada and affiliated dealers in other countries around the world.
It became one of the company's most popular models of all time, selling 6,000 units in the first month, with over 100,000 units eventually being sold globally before being discontinued in 1991.
The Olivetti M-10 and the NEC PC-8201 and PC-8300 were also built on the same Kyocera platform, with some design and hardware differences, which limited their compatibility with the Model 100.
The Model 100 was originally marketed as a Micro Executive Work Station (MEWS), although the term did not catch on and was eventually dropped.




Specifications



Processor: 8-bit Oki 80C85, CMOS, 2.4576 MHz

Memory: 32 KB ROM; 8, 16, 24, or 32 KB static RAM. Machines with less than 32 KB can be expanded in 8 KB increments of plug-in static RAM modules from Radio Shack or in various capacities from 3rd party vendors.
Radio Shack eventually offered an additional 32 KB Option ROM could be installed, for a total of 64 KB of ROM (bank-switched in a 32 KB aperture), and the Standard ROM is socket-mounted, not soldered-in, so it was readily replaceable by the owner.
As previously mentioned, aftermarket memory upgrades were also available and could be ordered from the back of the monthly magazine named Model 100 magazine.
The maximum amount of aftermarket memory that could be added to a Model 100 was 32 KB. This was in addition to the built-in 8 KB* of RAM, which was what most people could afford at the time of original purchase.
This allowed for a total of 40 KB when utilizing these aftermarket upgrades, commonly referred to as Bubble RAM.
There was also a variety of third party custom ROM modules, that were marketed that would replace the OEM ROM chip, allowing for increased customization for specific purposes that were based upon the owner's needs.

Display: 8 lines, 40 characters LCD, twisted nematic (gray) monochrome, with 240 by 64 pixel addressable graphics. The screen is reflective, not backlit. The screen was made by Sharp Electronics. The LCD controllers are by Hitachi: (10) HD44102CH column controller ICs and (2) HD44103CH row driver ICs; the HD44102CH's provide the programmable hardware interface to software. The refresh rate is about 70 Hz (coarsely regulated by an RC oscillator, not a crystal).
Keyboard: 56 keys, QWERTY layout with full standard spacing, 8 programmable function keys, 4 dedicated command keys, and 4 cursor control keys. These last 16 are tactile "button"-style keys. Almost all keys other than the 16 "button" keys are capable of key rollover (without phantom keys appearing depressed), so multi-key combinations can be used.
Peripherals: The basic unit includes: Built-in 300 baud telephone (POTS) modem (North American versions), Centronics-compatible parallel printer port, RS-232 serial communication port (sharing serial I/O chip with internal modem), barcode reader input, cassette audio tape I/O, real-time clock.
Expansion: System bus interface DIP socket (under a cover on the bottom of the machine).
Dimensions: 300 mm × 215 mm × 50 mm, weight about 1.4 kilograms (3.1 lb) with batteries
Power supply: Four penlight (AA) cells, or external power adapter 6V (>180 mA, tip negative configuration)
The 8K and 24K versions sold for US$1,099 and US$1,399 respectively.
The Model 100 was promoted as being able to run up to 20 hours and maintain memory up to 30 days on a set of four alkaline AA batteries. It could not run from the rechargeable nickel-cadmium batteries available at the time, but a hardware modification was available that made this possible.




Data storage


The Model 100's original form of external storage was the port for a cassette audiotape recorder that would lay alongside the Model 100.
Eventually, the instantly popular alternative to the cassette tape drives were the Tandy Portable Disk Drive (TPDD).
The TPDD was introduced in 1983 and was an industry standard RS-232 serial port connected device capable of storing 100 KB of data FM-encoded on a 3.5" single-sided double-density diskette.
This TPDD drive used the same DOS 1.0 format, which introduced the FAT (File Allocation Table) file system that was shared with IBM PC computer's at the time, which made it an extremely desired by businesses and government organizations.
But, much to the joy of Model 100 owners, there was a second version released late in 1984, known as the TPDD2,
This TPDD2 was labeled as being for the Radio Shack Model 100 and Tandy 102/200 and could store 200 KB on the same 3-1/2" floppy as the previous drive.
Also available was the Disk/Video Interface (DVI), which was also released in late 1984.
The DVI, which could be bought at local Radio Shack stores with 1 single-sided double-density (SS/DD) 180 KB 5-1/4" disk drive.
But, you could also place a special order thru Radio Shack to have your DVI built with 2 SS/DD 5-1/4" disk drives.
The custom ordered dual drive DVI was so rare that The Smithsonian Museum hasn't even got one on display, instead having to settle for the single drive DVI.
The monitors used with the DVI were typically in monochrome due to the more desirable and less stressful to the human eye amber screen still being considerably more expensive at the time.
But, regardless of the number of drives or color of the screen used, the DVI allowed the Model 100 to display 40 or 80 column video on an external television set or video monitor via a single RCA video connector.
Another popular feature of the Model 100 was its generous options to share files locally or globally via standard telephone lines.
The 3 options were:
1) The built-in Hayes compatible 300 baud direct connect modem connected to a telephone line via a standard RJ-25 connector.
2) Thru the acoustic coupler, which were basically suction cups that worked perfectly on pay phone hand receivers and served the same function as the aforementioned RJ-25 connector option.
3) The RS-232 serial port connected to a null modem adapter cable if transferring between computers that were right beside each other.
And, with the built-in TELCOM firmware, the Model 100 was an incredibly convenient option for journalists and other professionals to work on the go for the first time and simply transfer files globally with the ease of saving their work on their external storage.
In fact, it was common knowledge that the Model 100 was originally used extensively on the NASA space shuttle and was for many years, as NASA frequently showed video at the time of astronauts posing with them on the evening news.
Also, Tandy/Radio Shack offered a first of its kind Bar Code Reader Wand, which was appreciated by many types of industries for a number of reasons, including accounting for, tracking and ordering inventory with a simple swipe of the pen attached to a notebook computer.
This was a game changer for companies that came to appreciate the ease and speed this little notebook computer offered them more accurate inventory control while greatly decreasing the cost of labor.
In short, the Radio Shack Model 100 showed the world what a light and small notebook computer could do, which eventually led to the laptop computers that we are all still using today.
Cursor keys are used to navigate the menu and select one of the internal or added application programs, or any data file to be worked upon.
The 32 kilobyte read-only memory of the Model 100 contains the N82 version of the Microsoft BASIC 80 programming language.
This is similar to other Microsoft BASICs of the time and includes good support for the hardware features of the machine: pixel addressing of the display, support for the internal modem and serial port, monophonic sound, access to tape and RAM files, support for the real-time clock and the bar code reader, and I/O redirection between the machine's various logical devices.
Like previous Microsoft BASIC interpreters, variable names were restricted to two characters and all program lines and subroutines were numbered and not named. However, the default for floating point numbers is double-precision.
The ROM also contains a terminal program, TELCOM; an address/phone book organizer, ADDRSS; a to-do list organizer, SCHEDL; and a simple text editor, TEXT. The TELCOM program allows automation of a login sequence to a remote system under control of the BASIC interpreter.
As with other home computers of the era, a vast collection of PEEK and POKE locations were collected by avid hobbyists.
The Model 100 TEXT editor was noticeably slow in execution, especially for fast touch typists. This was due partly to the slow 8085 CPU and due partly to the slow response time of the LCD screen. Often after speed-typing a sentence or two, the user would have to wait several seconds for the computer to "catch up".
A perhaps not well-known but documented feature of TEXT was that it partially supported the WordStar command interface. The supported commands were the cursor movement and character deletion key combinations on the left hand side of the keyboard; the commands for activating Wordstar menus, like the Block menu, were not functional.
Invisible files in the system RAM named "Hayashi" and "Suzuki" commemorate the names of designers Junji Hayashi and Jay Suzuki. Another invisible deleted file named "RickY" refers to Rick Yamashita. The Model 100 firmware was the last Microsoft product that Bill Gates developed personally, along with Suzuki. According to Gates, "part of my nostalgia about this machine is this was the last machine where I wrote a very high percentage of the code in the product".
Added applications and data files are stored in the internal battery-backed RAM; these can be loaded from and stored to an audio cassette tape recorder or external floppy disk drive. Optional ROMs can be installed in the Model 100, providing a range of customized application software. Only one optional ROM can be installed at a time. Some commercial software applications for the Model 100 were also distributed on cassette.
The Model 100 ROM has a Y2K bug; the century displayed on the main menu was hard-coded as "19XX". Workarounds exist for this problem.
Most people just use 19xx again instead of 20xx, which the Model 100 can't handle, where 1924 would be used for 2024 in real life.
Since the century of the date is not important for any of the software functions, and the real-time clock hardware in the Model 100 does not have a calendar and requires the day of the week to be set independently of the date, the flaw does not at all impair the usability of the computer; it is cosmetic.




Applications


When introduced, the portability and simplicity of the Model 100 made it attractive to journalists, who could type about 11 pages of text (if upgraded to the maximum of 32 KB RAM) and then transmit it for electronic editing and production using the built-in modem and TELCOM program.
The keyboard is full-size and uses a standard (QWERTY) layout; reviewers praised it but reported that it was noisy. To quiet the computer, owners put orthodontic rubber bands under the keys. The computer is otherwise silent when it operates, except for the speaker, and runs for 20 hours on 4 readily available and easily replaceable AA batteries. Data is protected by a built-in rechargeable (Ni-Cd) battery when the AA batteries discharge or are removed for replacement. There are several simple programs available on the Internet for transferring files between a Model 100 and a modern personal computer (or a vintage one).
The Model 100 was also used for industrial applications and in science laboratories as a programming terminal for configuration of control systems and instruments. Its compactness (ease of handling and small space requirements), low maintenance needs, lack of air vents (a plus for dusty or dirty environments), full complement of ports, and easy portability made it very well suited for these applications.
Third-party peripherals for the Model 100 extended its battery life and file storage capacity. Software was designed, and is still available, to extend the display capabilities (to 60 columns and 10 rows of text using smaller characters) and to provide more advanced word-processing or calculation software than the supplied programs. To this day, hobbyists continue to design games, applications, and hardware for this device. Simple drawing programs and games using the pixel-addressable display were favorites among users. As with virtually all other contemporary home computers, users are able to create their own applications using the included BASIC programming language. There are no built-in facilities for 8085 assembler programming, but the thoroughly-documented BASIC interpreter by Microsoft offered the clever coder tricks for accessing machine code subroutines. These tricks usually involved packing the raw object code into strings or integer arrays, and would be familiar to veteran programmers for the older TRS-80 Models I and III.




Peers and successors



The Tandy 200 was introduced in 1984 as a more capable sister product of the Model 100. The Tandy 200 has a flip-up 16 line by 40 column display and came with 24 KB RAM which can be expanded to 72 KB (3 banks of 24 KB). Rather than the "button" style keys of the Model 100, its four arrow keys are a cluster of keys of the same size and shape as those comprising the keyboard, though the function and command "keys" are still of the button type. The Tandy 200 includes Multiplan, a spreadsheet application. It also added DTMF tone dialing for the internal modem, whereas the Model 100 only supports pulse dialing. On a phone line that doesn't support pulse dialing, users may dial manually using a touch-tone phone and then put the Model 100 online.

The last new model that could be considered part of this line was the Tandy 600, introduced in October 1985. Similar to the Tandy 200, it features a flip-up screen, but with 80 columns rather than 40. Built-in features include a 3.5" diskette drive, rechargeable batteries, and 32K of RAM expandable to 224K. The underlying software platform was Microsoft's 16-bit Hand Held Operating System (Handheld DOS or HHDOS), along with word processing, calendar, database, communication and spreadsheet software. Unlike earlier models, BASIC was an extra-cost option rather than built in.

The last refresh to the product line was the Tandy 102, introduced in 1986 as a direct replacement for the Model 100, having the same software, keyboard, and screen, and a nearly identical, but thinner, form factor that weighed about one pound less than the Model 100. This reduction in size and weight was made possible by the substitution of surface-mount chip packaging. Standard memory for the Model 102, 24K RAM, was upgradable to 32K with an ordinary 8K SRAM chip.

Later portables from Tandy no longer featured a ROM-based software environment, starting with the Tandy 1400LT, which ran a diskette-based MS-DOS operating system in 768 KB of RAM, utilising two built-in 3.5" floppy drives. This model resembled the IBM PC Convertible with a "clamshell" design and had a screen supporting a textual display of 80 x 25 characters and a graphical resolution of 640 x 200 pixels, with eight intensity levels achieved using a form of pulse-width modulation.

Tandy also released similar word processing portables for the education market based on a Z80-compatible CPU: the Tandy WP-2 in 1989 equipped with 32 KB of RAM and 256 KB of ROM containing the application software, and the Tandy WP-3 in 1993 equipped with 64 KB of RAM. The WP-2 provided serial and parallel interfaces, a cassette recorder port, an expansion card slot for 32 KB of non-volatile RAM, and an internal 32 KB RAM expansion slot. A disk drive was also available, connected via the serial port. In 1993, Tandy also announced the Tandy PPC-10 pocket PC, based on an 80C86-compatible CPU and having 1 MB of RAM, bundled with MS-DOS 5.0, Microsoft Works 2.0, PC link and personal information management software, also featuring two PCMCIA slots.




= Similar computers from other companies

=

The Olivetti M10, NEC PC-8201 and NEC PC-8300 were built on the same platform as the original Kyocera design, although the Olivetti M10 had a display that could be tilted towards the user.: 53  The earlier and smaller Epson HX-20 of 1982 used a much smaller LCD display, four lines of twenty characters, and had an internal cassette tape drive for program and file storage. There were several other "calculator-style" computers available at the time, including the Casio FP-200, the Compact Computer 40, and the Canon X-07.
Systems of about the same size and form-factor as the Model 100, aimed at journalists, were sold by companies such as Teleram, as the Teleram T-3000 and GRiD Systems, as the GRiD Compass, which was used by NASA. GRiD was later acquired by Tandy. The Bondwell 2 of 1985 was a CP/M laptop in a similar form factor to the Model 200. Both Convergent Technologies and MicroOffice released the WorkSlate and the RoadRunner respectively in late 1983, which similarly targeted mobile computing.
Computers from two other British companies were similar in form and functionality to the Model 100 and its successors. The Cambridge Z88 of 1987, developed by British inventor Sir Clive Sinclair, had greater expansion capacity due to its built-in cartridge slots. It had a far more sophisticated operating system called OZ that could run multiple applications in a task-switched environment. The firmware contained a powerful application called Pipedream that was a spreadsheet that could also serve capably as a word processor and database. In comparison, the Tandy WP-2 was regarded in one review as "easier to use and sturdier than the Z88" with a "proper keyboard" as opposed to the Z88's "rubber membrane keyboard". Moreover, the WP-2 also included a 100,000-word spellchecking dictionary and 200,000-word thesaurus, making the Tandy product more compelling as a dedicated word processor. The other British computers were the Amstrad NC100 and NC200, produced from 1992.
The electronic word processing keyboards AlphaSmart Dana and the Quickpad Pro bear some resemblance to the physical format of the TRS-80 Model 100. In Japan, Pomera still makes and sells dedicated word processors under model names Pomera DM100, Pomera DM200 etc.
The Laser 50 educational computer is in the same size and form factor as the Model 100, and was sold by Video Technology.




Reception


Tandy stated that the Model 100's sales "have only been moderate", and an InfoWorld columnist later claimed that "it was only journalists" who had been buying it.
The system's popularity with journalists, however, probably helped Radio Shack improve the company's poor reputation with the press and in the industry.
The magazine's reviewer called the computer "remarkable", praising its power relative to size and price and noting that he wrote the review "at the lofty height of 37,500 feet aboard a United DC-10".
He concluded, "I'm not used to giving Radio Shack kudos, but the Model 100 is a brave, imaginative, useful addition to the realm of microcomputerdom" and "a leading contender for InfoWorld's Hardware Product of the Year for 1983", an award which it indeed won.
BYTE in 1983 described the Model 100 as "an amazing machine." While noting the lack of mass storage, the reviewer praised "one of the nicest keyboards I've used on any machine, large or small" and the "equally impressive" built-in software, and concluded "the designers of this machine ... should be congratulated".
Your Computer magazine selected the Kyocera portable computer (including the Tandy, NEC and Olivetti models) as the best personal computer in its 1983 "Personal Computer of the Year" awards. Creative Computing said that the Model 100 was "the clear winner" in the category of notebook portables under $1000 for 1984, although cautioning that "the 8K version is practically useless".
The story behind The Guinness Book of World Record for the world's smallest BBS, which was run on a Model 100:
The person known for creating and operating the world's smallest BBS (Bulletin Board System) service on a TRS-80 Model 100 was is David A. W. Smith of the Atlanta, GA area.
Mr. Smith created all of his own code and ran a BBS called The South Atlanta Mini Board, which the Guinness Book of World Records verified as being "The World's Smallest BBS" on a TRS-80 Model 100 and increasingly faster auto answer Hayes Branded Modems starting with 300 baud to 1200 baud over the years, showcasing the capabilities of the Model 100 system, despite its compact format.
The head CoSysOp for Mr. Smith was Scott H. McGee because Mr. McGee was an absolute master of all modem protocols at the time, which were Hayes1, Hayes2, XModem, YModem, ZModemODEM, ASCII (for text transfer) and Binary.
But, Mr. Smith was never done improving the BBS and further proved himself a true pioneer by writing all his own code and creating chat rooms, which is still a popular thing on today's internet.
Those chat rooms were moderated by people Mr. Smith mentored, like E. B. Hammonds, who was appointed as a Co-Systems Operator (CoSysOp) and eventually went on to serve in the U.S. Military as a Communications Officer, applying the lessons taught to him by Mr. Smith.




Aftermarket products


DLPilot - allows a Palm OS PDA with a serial port to emulate a Tandy TPDD drive, providing affordable, comp, ap computer
ReMem - replaces all the memory in the laptop, aInofact, Mr. Smith went even e of 4MBas a of flash ROM and 2MB of SRAM
REXon his Model 100 - memoryedbsystem that fits in the option ROM socket
Tandy 200 RAM Module - adds 2 banks of 24kb to a T200
NADSBox - New Age Digital Storage Box - Interfaces an SD media card using the Tandy TPDD drive protocol for portable storage and easy file transfers to a desktop computer using industry-standard FAT-formatted Secure Digital cards.
PCSG's SupeROM - WriteROM word processor; FORM spreadsheet input template; LUCID spreadsheet; Database (relational); Thought outliner.
Soigeneris Backpack - a small SD card ‘disk drive’ for a Model T that runs from a single AA battery




References



Notes




External links



TRS 80 Mod. 100 in 1984 Radio Shack catalog
The Model 100 Users Group
Projects and products for 8-bit 'True Portable' laptops
Oldcomputers.net page on Kyotronic 85

"TRS-80 Tandy Model 200, 360 degree model", Vintage Laptop Museum (museum), April 6, 2017

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• Komputer mikro
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• TRS-80 Model 100
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• TRS-80 Model 4
• TRS-80 Model II
• List of TRS-80 and Tandy-branded computers
• Multiplan
• Microsoft BASIC
• History of laptops
• TRS-80 (disambiguation)
• List of TRS-80 clones