[Coco] OS-9 Level I v2.0 hard disk image how-to?

[Patrick Ulland]

Thanks for the link.  Fun fact, we now know 'a modified version of the 
first controller' happened about as often as CoNect's quarterly hardware 
respins :-) so poking at that  is maybe stupid. A late 15meg case still 
uses the Signetics drive emulator and a diffrnt drive. Same honkin' 
50pin ceramic CPU space heater, but note hand labeled ROMs and about 15 
sloppy bodgewires in blue kynar. Dem gals wat did it was in a hurry, 
too. I guess Tandy couldn't do yet another respin that quarter. Props to 
the techs, ~30 ugly cold solder wad bodges still work after 40 years. 
Just leave the lid on and nobody will even know.

There is also no way to know how far we can stray, so  our best wedge is 
the Tandy OS9 driver/descriptors in the devpak for each specific case. 
These include tracks and cyls for the mfm drive within, plug those  into 
a MFM drive emulator, bluetack inside the case, it should work for not 
only a CoCo, but any Tandy machine with a driver for that Tandy case 
size.  Results to come.

BTW, I am interested in The Company. SoT would be good for my bad hip 
and I can still get home for CoCoFest.  Get a brother a job?

-ricku



On 10/21/2022 3:43 PM, Robert "Exile In Paradise" Murphey via Coco wrote:
> On Sat, 2022-10-08 at 18:54 -0500, rick ulland via Coco wrote:
>> What are the old RS system?
> I've been digging to try to find out.
>
>
> 26-3145 Hard Drive Controller
> 26-4155 15-mb primary hard drive 1984 @ $2495
> 26-4171 35-mb primary hard drive 1985 @ $2995
> https://www.vintagecomputer.net/fjkraan/comp/trs80m2/m2FamilyPartNumberList.html
>
>
> 26-3145 Color Computer Hard Disk Interface goes to a WD1000-TB1
> controller board with a 50 pin interface, possibly SASI.
>
> The ST-506/ST-412 (MFM/RLL) interface protocol.
>
> The 15MB is described as a Tandon TM503
> The 35MB is described as a Quantum Q540
>
> https://vintagecomputer.net/tandy/mfm_mirror.html
>
>
>> Are they um, emulated in an emulator?
> Not that I have found.
>