silverdr@wfmh.org.pl wrote:
>
>
> I am not really sure if I understand correctly - are you trying to 
> understand the electrical properties of the interface out of the 
> C2N232 code? Again I am not sure if I got it right but isn't the 64 
> schematics a better source of this information? AFAIR (I don't have 
> the schematics at hand now) there is nothing really special about it 
> except that one line is IRQ capable and the motor power is a clumsy 
> TIP29/Zener combination, which doesn't really fit into digital (TTL) 
> IO and may require extra handling.
No, the electrical properties are not so much a mystery as the 
protocol.  There is this:

http://www.zimmers.net/anonftp/pub/cbm/crossplatform/transfer/C2N232/firmware/c2n-format.txt

But, I'm looking for an article or other reference that goes into more 
detail (read: the quick document above did not make sense to me)

There were a document on the C64 Tape preservation project site, but 
they waved their hand over the CBM stock routines, stating they were 
more complex than many tape loaders and then they went on to describe 
how tape loaders for games work.

Jim

-- 
Jim Brain, Brain Innovations                                      (X)
brain@jbrain.com 
Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times! 
Home: http://www.jbrain.com


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