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    Enabling double sided operation on a model 4

    OK I give up and am crying uncle. How do I enable double sided ops on a model 4. I have replaced the drives with Mitsubishi M4851s (double sided drives) and it doesn't enable the operation. Do I need to replace the cable or is it something else??? Thanks Robert
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    Model 4GA Woes: Catastropic Failure of the Smoke Test, Visible Victim U81

    Well as for being a trusting soul, the M4GA arrived last night and I decided to give it the Smoke Test and then, of course, I let the smoke out. Shut it down quickly and dug out the trusty digital meter. The power supply 12v was all over the place and then it settled to 13.8v, well that seemed...
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    And Now For Another Model III Adventure: NewDos/80

    OK the Model 3 has gone through another revision with the FreHD autoboot ROM installed. Current configuration is a standard 48K RAM, 2 drive system with Mitsubishi M4851 Floppies (two full height), and a FreHD w/autoboot. Future issues to be addressed are a new keyboard (if I can get Jay's...
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    Had a "good ???" Scare Last Night: Adventures in Setting Up the Model 3 to Autoboot

    Had a "good ???" Scare Last Night: Adventures in Setting Up the Model 3 to Autoboot Yesterday I received a package from Australia, thank you Ian, with my new Auto Boot ROM, two key caps (I need to send/post pictures of the keyboard, cause there are still issues) and a drive door. So my...
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    There has got to be a way: L-DOS, LS-DOS and FreHD

    Does anyone know or have experience with creating a LS-DOS (for booting a FreDH on a Model 4) from a model 3 running L-DOS (w/FreHD) so I can boot my Model 4 that I am expecting to arrive in two weeks or so ??? I should be receiving my auto boot ROM this week (or so I hope) for the model 3, so...
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    Greeting from Junction City, Oregon, USA

    Greetings to one and all Name here is Ross, I started out using a TRS-80 Model I and taught myself Basic and Assembler, way back in the late 70s. I was a Recruiter for the US Army in Irving Texas when an Army General came through doing an inspection, he spied my Model I in the back office and...
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    5.25 FDD - Well now this is a fine kettle of fish

    Refer to the photo Got a Mitsubishi 4851 1/2 height drive, ebay with the following problem. The drive door (lever) cam at the point of the pencil will not rotate on the shaft. The cam locks the door and positions the head to read the floppy. Very frustrating as this was to be the second...
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