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Thread: Model 3 Plus

  1. #1

    Default Model 3 Plus

    I just scored a TRS 80 Model 3 Plus, that aperantly was used at Kent State University. I have no clue or information about this machine but am very curious about it. If any one knows any thing about it please let me know. In one of the photos it shows that some one used a soldering iron to carv KSU on the top.


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  2. #2
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    There's an archive of "80 Microcomputing" magazine on Archive.org, if you search through it you can probably at least find an ad that was selling these machines. My vague memory is that MTI was a company that sold third-party drive and controller kits for upgrading cassette-based Model IIIs, and at some point they got into the business of actually buying bare cassette IIIs from Tandy, hot-rodding them in various ways, and selling them with those "plus" badges on them. My vague memory extends to thinking that they offered quite a menu of options, so it's possible that machine has double-sided drives, CP/M mods, any number of things.

  3. #3
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    If the 280 is correct, then the system should have 48kB of RAM and both disk drives would be 80-track drives (aka "quad density") and a speed boost to the CPU. Very nice upgrade compared to the standard Model III.

  4. #4
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    The quad density drives, if that's what it has, might make it a little tricky to make a boot disk if you don't have an apropos one, You should be able to do it on a PC's 1.2MB floppy drive with the right software combination, I think.

  5. #5

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    Any one interested in this Model 3 Plus PM me for details. I have not replaced the RIFA caps yet but I did release the Magic Smoke, and tested the machine to find it working, at least it displayed Cass when turned on with Break held down. I will have it at the TA in Springfield.

  6. #6
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    Looking forward to seeing this machine especially the innards of the beast !!!!

  7. #7
    Join Date
    Mar 2012
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    Augusta, Georgia, USA
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    I had a model 4 with 80-track drives and it was a pain since no "normal" disks work.

    I was able to create them with a PC drive and the "emulator pointing to the real disk drive" trick with the right settings. It took me a while to discover the drives were 80-track, for openers, and on top of that they were not aligned to each other...

  8. #8

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    Just Sold it to Pete. I wanted it to go to a good home.

  9. #9

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    well you can hand him this copy of what it is supposed to have been namely a MTI MOD 240, so a MODEL 3 with CP/M Board, 2 x dsdd (360K drives)

    Work : CORE2 QUAD Q9400, ASUS P5QL/EPU, 8GB DDR2-800, NVIDIA GT 720, 1TB HDD, ASUS PCE-N53 WIFI.
    Retro : Pentium II​I 1GHZ, BCM QS440B​XP, 1GB​ KIT PC-100, ATI RAGE 1​28 PRO GL ​32MB, ​80GB HDD, Netgear GA311 WIFI.
    Vintage: TRS-80 MODEL 4, 128K RAM, 1x 5.25" 360K, 1x GOTEK, 1xFreHD, GURU RS232-WIFI MODEM.

  10. #10
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    Jul 2009
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    @eudimorphodon Your right about floppy drives. I remember buying 2 of them back in 1978 for my Model 1. They were a bit cheaper than the RS drives and 40 tracks to boot. I think they were Tandon's but my memory id a bit vague on that. If that system were equipped with a 40 Track drive :0 and the other one an 80 track you would not have any issues.
    *FrankG*

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