From: Spiro Trikaliotis (ml-cbmhackers_at_trikaliotis.net)
Date: 2008-03-04 12:25:16
Hello Alex,
* On Tue, Mar 04, 2008 at 11:23:03AM +0100 Antitrack@networld.at wrote:
> I just imagined that it would be possible to connect an USB-device, for example
> some USB stick, to the tape port of the commodore 64. It probably has all the
> voltage and dataline(s) needed to get some USB hardware to work....
> But, would this work at all? Can the c64 match the required speed to drive
> usb1.1 hardware? What do you think?
You need to be able to gather (and send) data at 1.5 Mbit/s for USB 1.1
low speed. There are projects out there that squeeze this data rate out
of a 12 MHz AVR (cf. AVRUSB and USBTINY projects, which are both used
with the xu1541). To achieve this timing at 12 MHz, they must hand-code
the timing critical paths in assembler.
With more than 12 MHz, the AVRUSB project is even able to do something
besides bit-banging the USB bus, because some clock ticks remain for
other work ;)
I hope this answers your question?
Regards,
Spiro.
--
Spiro R. Trikaliotis http://opencbm.sf.net/
http://www.trikaliotis.net/ http://www.viceteam.org/
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