Re: Daisychaining 5.25 " Drives

[Giorgio Morocutti <gmoroc@libero.it>]

On Tue, 12 Sep 2006 01:42:22 -0700, "Michael J. Mahon"
<mjmahon@aol.com> wrote:

>> The idea here was to use the same drive on the ][ and /// line using
>> the proper host cable, the A2 being 19 pin, the /// being 25 pin. The
>> FileWare floppy (Twiggy) was slated for a 25 pin external version for
>> the /// as well.
....

>There are two wires from the controller: /ENBL1 and /ENBL2, which are
>drive select 1 and drive select 2.
>
>On the 20-pin card, only the corresponding signal is connected to the
>pin for the drive enable line.
>
>On the 19-pin card, both enable lines are connected, one to the "drive
>enable" line for the (first) disk, and one to a spare line that is
>crossed over to the "drive enable" line output on the daisy-chain
>connector of the first drive, to select the second drive in the chain.
>
>This is exactly the same approach used with the Apple III, but with
>three external disk select lines.  Apple III drives "shifted" the
>select lines "down by one" on their daisy-chain output connectors,
>so that subsequent drives would be selected by consecutive higher
>drive select lines.

I am referring to the question about Apple III with Apple Drive ][
because I like to know if anyone has carried out a "converter" to
utilize this drive for external use with Apple III. I think Apple III
and Apple II controller send out very similar signals, but they have
26pin and 20pin cables ...

Thanks a lot

Giorgio
Giorgio Morocutti
gmoroc(chiocciola)libero(punto)it

Apple II & Apple III forever !