Interesting reading here under disk formats:
Sounds like there were two Tarbell controllers, single and double density but
both single-sided ?
Also sounds like the FAT12 disk formats were not quite MS-DOS compatible...
----- Original Message -----
From: "Richard Cini via cctalk" <email@example.com>
Sent: Wednesday, August 09, 2017 2:52 PM
Subject: Re: Disk imaging with IMD - question
> Thanks Chuck. The Gazelle uses the Tarbell DD controller which uses a 1793
> which I believe is 3742 and s/34 compatible.
> Sent from Verizon/AOL Mobile Mail
> On Wednesday, August 9, 2017, Chuck Guzis via cctalk <firstname.lastname@example.org>
> On 08/09/2017 10:57 AM, Richard Cini via cctalk wrote:
>> "DON'T ASSUME..." AS THEY SAY ON TV. I'M OK WITH THE ADDITIONAL CLARITY.
>> SINCE YOU HAVE A WORKING 242, WOULD YOU MIND CONFIRMING THE JUMPER SETTINGS
>> FOR ME? JUST TRYING TO ELIMINATE AS MANY POTENTIAL ERROR POINTS.
> I had a look and a mental fart. I have the 842--the full-height model.
> I suspect that the jumpers are completely different.
> If you can use IMD to format both FM and MFM at 500Kbps on your 242--and
> "Analyze" reads the format okay, your SCP disks aren't probably standard
> IBM 3740 or System/3 type diskettes. They could be in a proprietary
> recording format, such as Intel MMFM or Futuredata GCR.