[Coco] Reading/Writing Model I/III/4 Disks on a CoCo

[Gene Heskett]

On Thursday 05 September 2013 10:08:19 Al Hartman did opine:

> That's not a problem unless you are trying to write single density Model
> I disks. And, if you have Super Utility for the Model I you can
> re-write the Data Address Marks to make them correct.
> 
> Most Coco Disk Controllers I know of use a disk controller chip
> compatible with the Model III/4.
> 
> I would check Craigslist, or a local recycler for an old XT class
> computer to use to make the disks on. I have one here I am building an
> 8-bit IDE Controller for to use a CF Card as a hard drive.
> (http://www.lo-tech.co.uk/wiki/Lo-tech_ISA_CompactFlash_Adapter_revision
> _2)
> 
> The other problem with using a Coco to make disk images, is that few
> people have hard drives for them to host the images on. I guess one
> could use Drivewire for that purpose. But, again, there's no software
> to write the image out.

Sure there is, it took me about an hour to knock it out in B09. Write LSN0, 
close the path, then reopen, and write the whole thing one sector at a 
time.  The dbl write of lsn0 is to get rid of the disk changed error.

> 
> If one has a PC with a 360k drive (you can add one to most machines up
> to Windows 98), Dave Dunfield's Imagedisk will allow you to image disks
> or create disks from images. He has some Model 4 disks available on his
> page. (http://www.classiccmp.org/dunfield/img/index.htm)
> 
> Some of the TRS-80 Emulators on the PC also come with utilities to
> image, or write disks as well.
> 
> - Al -
> 
> -----Original Message-----
> From: goosey
> 
> I think the CoCo's floppy controller could do it, but as far as I know
> nobody's written the code. Far worse than the 35/40 track issue is the
> fact that TRSDOS and cousins screw around with the inter-sector
> markings. I'm not entirely sure about the details.
> 
> Willard
> Sent from Samsung tablet
> 
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Cheers, Gene
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