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Thread: Model 1 26-1001 "D" - What's the D?

  1. #1

    Default Model 1 26-1001 "D" - What's the D?

    Hey all,

    I picked up an early M1 designated as 26-1001 D. I have had no luck trying to figure out what the D suffix indicates? Anyone have a clue?

    Cary
    8-Bit Family: Epson QX-10 w/ ComFiler 10MB HD | Kaypro 2X | TRS 80 Model I | TRS 80 CoCo 1,2 & 3 | TRS 80 M4 & 4D

  2. #2

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    The revision of the board. The D revision is probably the most popular and incorporates many fixes learned by Tandy along the way.

  3. #3

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    Ah, ok. Thanks Pete. It looks like an official RS sticker was placed over the original catalog number designating a D board as pictured here. I am guessing this was done prior to leaving Fort Worth, unless users could bring their original computers in for an upgrade.
    RS.jpg
    8-Bit Family: Epson QX-10 w/ ComFiler 10MB HD | Kaypro 2X | TRS 80 Model I | TRS 80 CoCo 1,2 & 3 | TRS 80 M4 & 4D

  4. #4
    Join Date
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    D boards were sold from early 1978 to mid 79 and usually came with the keybounce keyboard as shown in the auction listing you are referring to.

    The are the first large scale production after initial problems were solved though they do have a restriction that they will only support a Level II satellite board. Also on these D boards a modification (XRX-III) needs to be done so Level II cassette reads are easier.

    For a short time they released a few thousand E boards, then the G board was the next big volume seller. In contrast to Pski I think they sold more G boards than D boards but there is no actual way to confirm this. G boards came with an ALPS keyboard, and Level II Basic now fitted on two Eproms so the satellite Level II board was no longer needed. They fixed some bugs in Level II Basic at this time so now the XRX-III mod was not needed for reliable cassette operation.

    However to put all this into perspective, with regards to the motherboards, they are all the same save for a few different routings related to the Rom selection, the rest is exactly the same.

    Just my 2c worth.
    *There is never a charge for Tech Support even if you don't purchase from me - We are Enthusiasts Helping Other Enthusiast and that is just the way it is

  5. #5

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    Thanks for the information Ian. I am hoping this is an unmolested Level 1 unit which I would like to preserve.
    8-Bit Family: Epson QX-10 w/ ComFiler 10MB HD | Kaypro 2X | TRS 80 Model I | TRS 80 CoCo 1,2 & 3 | TRS 80 M4 & 4D

  6. #6

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    My 16k Level II machine with keypad is has a -1 suffix added to the catalog number with a separate little sticker. The board appears to be marked as rev. G, but the system has a daughterboard for the Level II.

    IMG_1524.jpg IMG_1523.jpg IMG_1522.jpg IMG_1525.jpg IMG_1526.jpg IMG_1527.jpg IMG_1528.jpg IMG_1530.jpg

  7. #7
    Join Date
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    That's one nice M1 there Mark, as long as it runs I wouldn't worry too much about it.
    *There is never a charge for Tech Support even if you don't purchase from me - We are Enthusiasts Helping Other Enthusiast and that is just the way it is

  8. #8

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    Quote Originally Posted by NF6X View Post
    My 16k Level II machine with keypad is has a -1 suffix added to the catalog number with a separate little sticker. The board appears to be marked as rev. G, but the system has a daughterboard for the Level II.
    That's interesting. From the different catalog numbers I gathered years ago I always thought the 26-1006-1 was for the 16k Level II without keypad
    Collection online nonstop since May 1997: http://www.cchaven.com

  9. #9

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    26-001/2/3/4/5/6/8 are the models and the D indicates a submodel. You can also see it's more complex model revs and features as they appeared in the catalogs.

    The 1001 was the first one, not the most common. The rarest is the 26-1008.

    http://oldcomputers.net/trs80i.html
    http://www.cchaven.com/MODELI.HTML (CCHAVEN's site!)

    I have the 26-1008 which is not listed on either of these sites.

    I am kind of a closet Model 1 aficionado, I made a pretty nice exhibit for VCF East 4 about 12 years ago.
    http://www.vintagecomputer.net/vcf4/...TRS80_30th.jpg
    and another at the University of Delaware:
    http://www.vintagecomputer.net/UofDe...CM_TRS80-2.JPG

    I still use my stringy floppy drive, I restored the drive belt, the hardest part to getting them running after so many years. If anyone is interested I can fire up the 1008, it was never supposed to have been sold, that old story. Like the Commodore P500 a few got out. I think at this point the RF police was let this one live.
    Bill
    @ BillDeg:
    Web: vintagecomputer.net
    Twitter: @billdeg
    Youtube: @billdeg
    Unauthorized Bio

  10. #10
    Join Date
    Aug 2013
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    Default

    What is the 26-1008?

    Tom

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