20 May
2013
20 May
'13
9:42 a.m.
On Mon, May 20, 2013 at 6:29 AM, Al Kossow <aek at bitsavers.org> wrote:
Does anyone
know technical reasons why the M0131 is different from the
M0130...
The big difference is that the
400k drive's motor speed is controlled by software in the mac driver
The pins were reused in 800k and later drives for other functions From the descriptions of "yellow stripe" and
"red stripe" and a few
other nuggets I've dug up, I can see that Apple
did mess around
with pin definitions, but I've only managed to find one definition
so far, and as far as I can tell, it's for the 800K drives.
I have a table somewhere which describes the exact
cable changes and
the differences between the Mac and A][ versions of the drives. I'll try to
get over to storage later this week and dig it out.
That would be great. Thanks, Al!
At the moment, I think my best chance for swift progress is to stop
fiddling with the M0131 drives and go find my later "platinum" 3.5
drives (I used to use one with my Amiga 3000/A-Max combo). Those
appear to work with all Macs where the M0131 has the blind-spot with
the unupgraded Mac 128K/512K.
-ethan