Disk imaging with IMD - question

Mike Stein mhs.stein at gmail.com
Wed Aug 9 14:28:37 CDT 2017


Interesting reading here under disk formats:
https://en.wikipedia.org/wiki/86-DOS

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...

m

----- Original Message ----- 
From: "Richard Cini via cctalk" <cctalk at classiccmp.org>
To: <cctalk at classiccmp.org>
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. 
> 
> Rich
> 
> Sent from Verizon/AOL Mobile Mail
> 
> On Wednesday, August 9, 2017, Chuck Guzis via cctalk <cctalk at classiccmp.org> wrote:
> 
> 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.
> 
> --Chuck
> 
>


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