Re: Question:The internal 3 1/2 drive on the //c+

[Mitchell Spector <mitch2gs@hotmail.com>]

"Michael J. Mahon" <mjmahon@aol.com> wrote:

>Sean Fahey wrote:
>> Michael J. Mahon wrote:
>> 
>>> Lockar wrote:
>>>
>>>>      I think I've asked this before.  What is different with either the
>>>> disk coltroler or physical 3 1/2 drive on a Apple //c+ that would not
>>>> let you to do bit copy.       I remember when I got the //c+ (my 
>>>> second comouter when I was
>>>> young) that you can't use the bit copy of CopyIIplus unless you used an
>>>> external drive.       Why is this?
>>>
>>>
>>>
>>> Because the Unidisk 3.5 has an onboard processor that actually controls
>>> the drive.  It only passes data to/from the "Liron" controller.
>> 
>> 
>> This applies to the //c Plus?
>
>Whoops!  No, it applies to the //c--I should have read more closely!
>
>Perhaps the issue is the way that the SWIM chip is controlled...

    Minor nitpick: All Apple IIc models, including the IIc Plus, use an IWM.

    The only Apple II related peripheral to use a SWIM controller chip was
the Apple II 3.5 Disk Controller Card (aka SuperDrive card). It nearly was
added to the Apple IIgs, you can find a SWIM on "Mark Twain" prototype 
boards.

Mitchell Spector