speaking of 3.5" floppies, is 720K R.I.P.?

[dwight elvey]

----------------------------------------
> From: cclist at sydex.com
> To: cctalk at classiccmp.org
> Date: Mon, 2 Feb 2009 10:14:57 -0800
> Subject: RE: speaking of 3.5" floppies, is 720K R.I.P.?
>
> On 2 Feb 2009 at 7:13, dwight elvey wrote:
>
>> I'd given up on finding ones with the /READY signal.
>> I needed one to add double sided to my Canon Cat. It
>> had a Canon with a weird 20 pin cable that I just recently
>> figured out the wiring. I made a circuit with three ttl
>> chips to recreate the /READY that works well enough.
>> I had to make a cable translator anyway so I had
>> a piece of proto board to add the chips on.
>
> I've done the same here with an 8-pin PIC (the advantage is that
> there are no discrete timing components). The same could probably be
> done with one of the 6-pin PICs. But finding drives with a native
> READY signal is better.
>
> Cheers,
> Chuck
>

Hi
 The only timing I had was for powerup reset. Just a cap, resistor
and diode. The rest is digital. I use an edge on diskchange
to clear and the first index to set. It isn't perfect as one
could stick a disk in and turn the motor on and then remove
without stepping. This is not likely on the Cat because
it always uses the disk for a dump ( multiple tracks ).
 The Teac holds the index until ready.
Dwight
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