TRS-80 Model 100, the original laptop

Now, when working at home I spend most of my time coding and writing on my retro-fitted TRS-80 PC running Ubuntu, but when not there it is either a laptop or smart phone.  Mobility is something we take for granted and that freedom to go anywhere with that computing power has changed our lives and has even created new business models like Uber and Lyft which is just amazing when you think about it.

Now while I can not imagine not having my iPhone, laptop or tablet, it was not too long ago that the idea of having a computer on the road was revolutionary.  One of the earliest “laptops” was the TRS-80 Model 100, a marvelous machine that was very popular with writers and journalists for its core features of a full-sized keyboard, simple text editing and the ability to use its built-in modem and send your documents back to your office computer.

My personal TRS-80 Model 100 laptop computer

This computer has been on my collection bucket list for sometime and when I got it over 6 months ago I was not expecting it, I was actively chasing a different computer, the elusive Sinclair QL – which I still do not have :-(, when I stumbled into a great deal on the Model 100 and scooped it up.   I am not the only person that has a soft-spot for this computer, Bill Gates has referred to this computer as one of his favorites as it runs some of the last Microsoft software that he was heavily involved in the coding personally.

Some of the key features of this machine include:

  • CPU 2.4-MHz Intel 80C85
  • Memory 8 KB – 24K and expandable up to 32 KB (mine appears to have 24K)
  • Display 8 lines, 40 characters LCD
  • Graphics 240 by 64 pixel addressable graphics
  • Built-in 300 baud modem (heck yeah, feel the speed!)
  • Parallel printer interface (bring back the good-old days of huge cables!)
  • RS-232C serial (up to 19,200 baud)
  • Cassette tape interface (1500 baud)
  • Standard bar-code reader interface (um… yeah, need one of these all the time)
  • Powered by 4 AA Batteries or a 6V power adapter
  • Size: 300 by 215 x 50 mm, weight of about 3 lbs (just a smidge more than a Macbook Air laptop!)

It is all about mobility and connectivity with this computer

This computer is very fun to work on, the keys feel great to type on and as long as your work involves typing words for a “document” or coding, then you have everything you need.  Well, as long as the code you are writing is in BASIC, the built-in language (and operating system for that matter) that controls everything on this machine.

The user interface is a simple grid view of files that you select using arrow keys and built in function buttons.  Selecting a file takes you into that file and allows you to edit it.  While it lists capabilities like address book and scheduler, all of the programs (other than the basic interpreter) are essentially the same program, allowing you to edit text.  All of the control you have over the files you edit is based on how you structure the files and codes you use, but in reality, you are really just creating fancy shopping lists.

LCD Display has an easy-to-use interface of navigate and select

The only two functions I find useful on a regular basis is the core text editing (think notepad-lite) and the basic interpreter.  As BASIC was the very first language I learned to code in the late 70s, this little machine provided a type of time-machine that took me back to stringing together simple little loops and inputs to create fun games like vertical-scrolling games for racing and skiing.  So that is what I did first!  Well, that was after trying to set the clock date/time.  This little gem is from a time when the year 2000 was expected to be so far off that nobody would ever care about date overflow problems, why worry, we would have flying cars and world peace.  Hmm… oh well.

To get even remotely correct I had to set it to 1917 instead of 2017 (see screen shot above), but this allowed me to set the day/time correct and it has been correct for many months now (on the same double AA batteries installed when i got it!)  And yes, I did start taking the pics for this article on New Years Eve 2017 at 2:30pm!  This little machine is just amazing.

Expansion via ports on bottom, leather case and power and display controls on side

Now while writing simple BASIC programs is fun, my plans for this machine is similar to all of my others, connectivity.  I am looking to connect this little laptop to my desktop machine first, then eventually to the Internet.  While I do not expect to surf the web, I would like the ability to potentially connect the interface through an external proxy device like my ESP8266 that is running a terminal emulator and connecting to a remote machine.

ESP8266 wifi micro controller to connect Model 100 to the world

Being able to wirelessly SSH into a machine (via the ESP8266) and have keyboard control over my cloud servers would be a blast.  Now this project is really tied to many of my other projects (this the same goal I have for many of my favorite 8-bit and 16-bit computers), so we will see how long this takes me to achieve it.

Today my TRS-80 Model 100 lives in its protective leather pouch, perched on top of my Amiga 1000 and next to my main computer, my Retro-fitted TRS-80 PC where I run this blog.  I keep it close by because it is such a fun device to play with from time to time as a form of historical inspiration and maybe a bit of a digital zen garden, but without the sand and little rake.  🙂

Model 100 lives in my office atop another favorite computer, my Amiga 1000

I will try to update my progress as each step is achieved, with the first being just connecting via cable to my desktop Ubuntu machine for file transfers.  I hope you get a chance to leave a comment, I would love to hear from anyone that enjoys this machine today or in the past and also from anyone trying to connect older machines to the net!





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