[Coco] VCC Emu problems

[Gene Heskett]

On Saturday 04 August 2007, Phill Harvey-Smith wrote:
>Gene Heskett wrote:
>> And don't forget that the 1.2 meg drive spins at 360 rpm, not 300, and
>> that it expects its data to 500 kilobaud, not 250 kilobaud.
>
>Though if the floppy driver is correctly written when you try and write
>in a standard double density format it should be able to tell the drive
>to use 250K, which is IIRC why my 1.2 sounds different when reading a
>360K floppy to when it's reading a 1.2M. Cirtainly it sounds to me like
>the speed is changing.

Humm, what floppy controller do you have, Phill?

There is not to my knowledge, any facility available in the std shack 
controllers that can change the drives speed.  Any such option in the drives 
became available a half a decade (or more) after all the 1773 controllers 
designs had already been obsoleted by the makers, including Tony D's stuff.

I believe the 500 kilobaud conversion for the original 12 volt shack 
controller does enable that however.

>> If you can find the
>> jumper that slow it down to 300 rpm, then its a 100% functional
>> replacement for a 720k drive.  The comments re the track width are spot on
>> though.
>
>Yeah that would be the sure fire way, I have a couple of one perticular
>drive type, where one was supplied as a 1.2M drive and the other was
>supplied as a 720K, so that sounds like it would work.
>
>Cheers.
>
>Phill.



-- 
Cheers, Gene
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