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Inside the TRS-80 Model 100

enalbro writes "What wouldn't you give for a laptop that starts instantly, weighs 3 pounds and gets 20 hours of battery life? That's the TRS-80 Model 100 in a nutshell. Granted, it displays only 8 lines of text and has just 28 kilobytes of memory, but it's a classic, the first truly popular portable in the U.S. At PC World we have a teardown that'll show you the guts of this featherweight champ." And, like many of the best things in life, it's powered by AA batteries (as is the Apple eMate).

10 of 228 comments (clear)

  1. The best part about the TRS-80 Model 100... by thesolo · · Score: 4, Interesting

    And the best part of it is...the control key is in the proper place! That is to say, it's directly left of the A key, on the home row. Just like the Happy Hacker or Sun keyboards. Amen.

  2. Love it! by Saint+Aardvark · · Score: 3, Interesting

    Came across one in the hallway of a university I sometimes work at; it had been left for the janitors to take away so I snagged it for my son. He's almost two, and has fun banging away on it...any time he starts making his way toward my laptop, or my wife's, we just say, "Hey, where's your laptop these days?"

    Only problem is, my wife has an iBook, and once he notices that his laptop isn't nearly as shiny as hers we're doomed. Lucky thing I'm a Linux sysadmin...I can just point to an xterm once he starts wondering about the difference between his laptop and ours. :-)

  3. I still have mine by corsec67 · · Score: 4, Interesting

    Granted, it is older than I am, but it is indeed quite impressive. My parents gave it to me when I was about 10 years old. Since I wanted to play games on it, I had to type code in from a book.

    Instant boot. Sunlight readable display. Full travel keyboard, full size keys. Ctrl key in the correct place. No screen joints to wear out.

    20 hours, on 4 AA batteries. No proprietary battery.

    External storage is an audio cassette. I think it uses the modem to generate the sounds for the cassette, but I could be wrong.

    The OS does have a few bugs, where if a program does something bad (not using PEEK and POKE, but pure basic), or is too big to tokenize, it crashes and erases all memory. That makes writing big programs very exciting.

    The OS also isn't Y2K compatible, with this year being "1908".

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  4. Re:Bought two used ones a long time back by eck011219 · · Score: 3, Interesting

    We had one that my dad left in the trunk of the car for about a week in the summer so the keys partially melted. It was hard to type (you really had to pound on a couple of the keys to get them to register) but it still worked like a charm. Now I worry about my Dell laptop on humid days.

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  5. I still use mine by jridley · · Score: 4, Interesting

    I have 3 of them, picked up a couple of spares off eBay for $30 total.

    I use them to take minutes at meetings. I used to have a PC laptop but since all I used it for was to take minutes, I gave it to my brother who actually needed it. The Model 100 performs minute-taking just fine. Also I can touch type on it better than on a newer laptop keyboard.

    The Model 100 was a MAINSTAY of journalists at the time; since it ran for many hours on AA batteries which you could get anywhere, even in small towns in foreign countries, and it had a built-in modem and a very portable acoustic coupler that would work with any phone you could find. I bet the majority of remote print reporting for several years was typed in the field on a Model 100.

  6. Re:Bought two used ones a long time back by Ooblek · · Score: 3, Interesting
    A friend was cleaning out his garage once and had one of these in a box. He gave it to me. I like tinkering with antique computers on occasion. (I still have my C64 programmers handbook that has the fold-out motherboard schematic in the back.)

    A few years later, I velcroed it to a pull-out rack shelf and hooked a null modem cable to it to monitor the console output of a SSL Screen Sound setup (proprietary pro-audio digital mixer/editor in the days before Pro-tools). It couldn't quite keep up with the 9600 baud stream if there was a lot of data streaming fast like during bootup. It did the trick, however, when you just needed to go in and check some of the statuses while the system was running. I think I mostly used it to go in and low-level format the hard drives on occasion.

    It was useful for a while, and that must have been somewhere in the mid-90s that I used it.

  7. If you write for a living by jalefkowit · · Score: 3, Interesting

    ... the Model 100 is kinda the definition of the perfect portable:

    • Insane battery life on bog-standard AA batteries you can buy in any airport gift shop
    • Full size keyboard for easy typing
    • Screen you can read in sunlight
    • Case tough enough to take a serious beating without a flinch

    Sure, it doesn't have the bells and whistles the kids are into like "color" or "graphics", but in a portable for writers none of that is really important -- which is why many journalists held on to their Model 100s long after they became ludicrously obsolete.

    With the demise of products like the Psion Series 5 (another writer's portable), the niche that the Model 100 pioneered has basically been abandoned; the only thing close to it today is the EEE PC, which would be an ideal spiritual successor to the hardy 100 if the keyboard wasn't so danged small...

  8. Tandy/Sharp PC-2 by GottliebPins · · Score: 3, Interesting

    My friend had a Model 100 and I was so jealous. That thing rocked! But I still have my TRS-80 PC-2 pocket computer. It's so easy to use. It's better than a calculator. You can type out entire formulas then if you make a mistake you can hit the back button and see the whole formula and fix whatever you did wrong. I use it every year come tax time. For such a small display you can address every pixel if you want to draw something or make a simple game and it has a speaker you can play music on. I also have the cassette/printer interface. The printer isn't a dot matrix but pen plotter. That was cool to watch it print reports or draw graphs. The paper goes up and down and the pens go side to side. That memory on it lasts for weeks on 4 AA batteries. Sometimes simple is better.

  9. Re:GK Chesterton by schwaang · · Score: 4, Interesting

    With the new crop of machines like the EEE PC it seems that we're moving back to small, power-efficient machines as opposed to huge hulkers.


    What's interesting to me is the tension this sets up with operating systems like Vista which are moving in the opposite direction.

    Just when the ultimate in MS bloatware comes out, suddenly a new (again) market appears for ultra-portable general-purpose PCs that can't run Vista.

    So we have WinXP on the OLPC XO-1 and Asus EEE PC, etc., because Vista's too big and WinCE is too small. XP or linux+xfce are juuust right.

    Personally I *want* my desktop to handle speech recognition and swooshy graphics if it has the beef. And I want my portable to have a huge battery life AND a general-purpose OS.

    So I think this OS bloat bifurcation should continue.
  10. I learned to program by presidentbeef · · Score: 3, Interesting

    on one of these that my uncle gave me. Pretty much changed my life.

    What this article really failed to mention was the software side. You could program anything on the computer in BASIC and the LCD screen made it easy to create and position graphics (no need to worry about resolution - each pixel is always in exactly the same place and precisely the same number characters will always fit on the screen.) Made for years of writing games and applications on that thing. This is really something the "laptops for kids" people should be thinking about.

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