19 May
2013
19 May
'13
1:14 a.m.
On Sat, May 18, 2013 at 4:48 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
> Does anyone know technical reasons why the M0131
is different from the
> M0130 besides the different mech?
OK... modification to the question... does anyone know the specific
technical differences between versions of 800K Mac drives? It apparently
does matter.
http://68kmac.com/Mac128/Mac_128_Update/Entries/2007/9/1_Formatting_800K_MF…
IIRC, the 800K drive sets the spindle speed
autmattically depending on which cylinder tis's on, the 400K drive takes
a PWM speed control signal from the Mac mainboard.
I do remember that difference now that you mention it. The 400K
drives almost sang as they flew from track to track.
There are some oddiites in the floppy cabling, to the
extnt that the
internal drive ribbon cables have 1 or 2 wires missign (solid plastic).
I think that a pin that's a power line (-5V?) on the logic board is
'remote eject' at the drive. But that couldn't be fixed with software, so
that can't be it.
Found a reference... Pins "9 (-12v)" and "20 (speed)" for internal
cabling
(obviously there's no pin 20 on a 19 pin external connector).
Have tyou tried it? Given that it can be made to work
on the Mac 512 with
software chages (new ROMs or an OS extension), I don;t think plugging it
in will do any damage.
I doubt it will damage anything, but from what I've read, others have tried
it and it's known not to work. The "newer" 800K drives work but not the
older mech in the M0131
-ethan