10 Sep
2023
10 Sep
'23
10:07 p.m.
>> On Sun, 10 Sep 2023, Chuck Guzis via cctalk
wrote:
>>> Can't say, but probably. I've got an 8" disk here written by an
Apple
>>> II. Encoding is weird--basically the Apple RWTS encoded as 8 bit FM
>>> (3740) bytes. Haven't bothered to see from whence it came.
> On 9/10/23 13:31, Fred Cisin via cctalk wrote:
>> Sorrento Valley Associates sold an FDC for Apple2. At Comdex, they had
>> it wired to an 8" drive. So, perhaps they supported an FM version of
>> the Apple2 GCR format?
On Sun, Sep 10, 2023 at 2:24 PM Chuck Guzis via cctalk
<
cctalk(a)classiccmp.org> wrote:
> Have no idea, but was surprise to see RWTS encodings in standard FM.
On Sun, 10 Sep 2023, Sellam Abraham via cctalk wrote:
No, that controller (I'm suspecting) allowed
native Apple ][ access to IBM
3740 format disks.
I have no idea about the format(s) supported with that board.
Possibly FM (for 8"SSSD, which is what the Flagstaff Engineering modified
5150 FDC was for)
Possibly MFM (for 5150 disks, but could also, with appropriate
additional software handle thousands of others)
Could it have also had support for pseudo Apple-DOS (and Apple CP/M,
P-System, ProDOS), so that machines with that controller, but without also
Apple drives, could run Apple software/programs, once copied to an FM
pseudo AppleDOS format?
--
Grumpy Ol' Fred cisin(a)xenosoft.com