Re: Apple floppy adaptor. I'm stuck!

["William Garber" <willy46pa@garberstreet.com>]

"Tristan Mumford" <xtristan.xmumford@xgmail.xcom> wrote in message news:45d65776$0$52912$c30e37c6@lon-reader.news.telstra.net...
: Bryan Parkoff wrote:
:
: > Are you referring you want to hook up PC 3.5" drive to Disk II controller
: > card?  It may not work.  You can try PC 5.25" drive and build an adapter.
: > You need to write software routine to control PC 5.25" drive.  In other
: > words for PC 3.5" drive, you may need Unidisk 3.5" controller card.
: > Either cards can read PC 5.25" / 3.5" drive using GCR encoding format.
: >
: > Bryan Parkoff
:
: Whether it's a 3.5" or 5.25" it shouldn't make a difference should it?
: All differences in stepping and other control signals are handled by a hex
: inverter and a uC.
: Thankfully none of the extremely time-critical lines needed processing by
: the uC. There is tons of time left in the stepping routine.
:
: As for the possible, okay probable error in my stepping routine if I can't
: nail it easily I'll either plop a max232 on the serial lines of the uC and
: send the trackcount, or just dump the 4lsb of the trackcount to the 4 free
: lines on the uC and give it a povvo binary trackcounter. Ie 4 leds.
:
: Could you please tell me what advantages the unidisk controller has? I have
: both a Unidisk controller and a non-exact clone disk ii card. I think you
: saw the photo of it a month back.
:
: Tristan.


The Liron(Unidisk) controller wouldn't do you much good.
It simply transfers data packets to the Unidisk's internal
computer, where a 6502 and IWM plus RAM handle the actual
accessing of the drive itself.

William Garber
Email Address - willy46pa@garberstreet.com
Alt. Email - willy46pa@comcast.net
Web address - http://www.garberstreet.com