Jeff Walther wrote:
>
> >Date: Thu, 10 Oct 2002 14:21:42 +0100
> >From: Mark Benson <[EMAIL PROTECTED]>
>
> >OK, consider me significantly confused an somewhat nose-out-of-jointed.
> >I guess it;s a little harder than i thought ;).
>
> It would be challenging, but not necessarily impossible. You really
> need to open up an AEHD+ if you want to know how hard it would be.
-------------
> 4) If you overcome 2 and 3, then it's worth tracing the circuit
> board of the device to develop a schematic. The board may have more
> than two layers so you really need to check connections with a
> continuity meter and it helps to have some idea of how the device is
> built so that you can make guesses about what should connect to what.
> This part is not difficult but can be very tedious.
actually, assuming it doesn't all have a ground plane or power plane in the way (which
allot of
simple boards still don't) a bright light is fairly useful for looking through the
board, you can
see the traces on both sides and in the middle, though you still have to check with a
meter to
untangle them it gives you some idea.
the floppy interface sounds very challenging. i think the 800k floppies still used
variable speed,
which means it's probably also something tricky with the particular pc drive involved.
many of the
"copy protect" schemes on the apple II did things like that, and made floppies useless
on other
brands of drives for the apple II when they came out (not to mention people quickly
figured it out
anyway). it wouldn't surprise me if there had been a slight mod done on the floppy as
well
possibly, that would seem to be the easiest way to get the variable speed, i.e. to
hack into the
speed controller on the drive. or it may let the drive run at constant speed, but
change the bit
rate fed to the drive which seems likely given the complexity you describe, although
that has other
likely problems with the drive hardware since i think they usually do that data/clock
recovery stuff.
in any case, good luck, even if you did misspell my name (i'm not one of those people
who cares
allot, besides which it's always being misspelled, and as most know, i can't spell
anyway, spell
check on emails is somewhat embarrassing most of the time for me.)
--
The right of citizens to bear arms is just one guarantee against arbitrary government,
one
more safeguard against tyranny which now appears remote in America, but which
historically
has proved to be always possible." --Senator Hubert H. Humphrey. Here it comes again
<http://www.progressive.org/webex/wxmc042702.html><http://www.counterpunch.org/oden1.html>
--
Compact Macs is sponsored by <http://lowendmac.com/>.
Support Low End Mac <http://lowendmac.com/lists/support.html>
Compact Macs list info: <http://lowendmac.com/lists/compact.shtml>
The FAQ: <http://macfaq.org/>
--> AOL users, remove "mailto:";
Send list messages to: <mailto:[EMAIL PROTECTED]>
To unsubscribe, email: <mailto:[EMAIL PROTECTED]>
For digest mode, email: <mailto:[EMAIL PROTECTED]>
Subscription questions: <mailto:[EMAIL PROTECTED]>
Archive:<http://www.mail-archive.com/compact.macs%40mail.maclaunch.com/>
Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
