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Thread: Tandy Model III - Identifying 5 1/4 Drives

  1. #11
    Join Date
    Mar 2013
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    Chaffee, MO
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    http://www.trs-80.org/omikron-mapper/

    The Omikron Mapper III was for the TRS‑80 Model III. Unlike the Mapper I, it only supported 5″ drives. It cost $199 in 1983.

    Usage:

    After installing the Omikron Mapper, the only visible changes were seen when starting the TRS‑80. The Omikron Mapper
    would display a short message presenting two options:

    Pressing C would boot a CP/M disk
    Pressing T would boot a TRSDOS (or any other TRS‑80 operating system) disk

    In addition, pressing T and BREAK would start Level II cassette BASIC

    Larry

  2. #12
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    Mar 2013
    Location
    Chaffee, MO
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    I sent you several Images and the "ND80M3-3.DSK" should boot properly. The Step rate is set for
    40ms. I had a choice of 20 or 40.

    Let us know if it boots fine.

    Larry

  3. #13

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    quite an interesting catch indeed. I say leave it as is if it works if not get a RS FDC a 360K and a FrehD and enjoy the snot out of it. CPM and TRSDOS equally.
    Gaming: i7-8700K, 16GB, 1TB SSD, RTX 2060, Dual 27" LG IPS Monitors.
    Vintage: TRS-80 MODEL 4, 128K RAM, 360K FDD, Gotek USB FDD, FreHD HDD, RS232-WIFI MODEM, DWP-510.
    Programmer: Dell Inspiron 660S i3-3220 with 16GB Ram, running a BK-844USB & EP-2A-88.
    Web Site: https://texastandyrestoration.com/
    Facebook Page: https://www.facebook.com/TexasTandyRestorations/

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