Marko Mäkelä wrote:
> Dear Robert,
>
> I don't know of any USB related project for the Commodores. But I don't
> think it's impossible; one could possibly find enough information in the
> USB driver source code of Linux or BSD systems, even if the relevant
> standard documents cannot be obtained at a reasonable cost. Let's see if
> anyone on the cbm-hackers list warms up for this idea.
>
I had a project just like that going for a while, but it never got
finished. Mostly because the XM1541 interface provides most of the
features I was looking for at a much more attractive price tag.
If anyone's still interested in picking up where I left off, I'll be
happy to hand over the materials I have so far.
A good place to start is to have a look at Cypress Semiconductors EZ-USB
chips
(http://www.cypress.com/usb/fullspeed/ezusb.html).
They handle just about everything concerning the USB protocol on-chip,
and in addition contains an 8051-compatible microcontroller, complete
with lots of I/O ports, timers, interrupt controller, UART, an I2C
controller, etc. Loads of nice stuff in a single chip in other words.
All for the very competitive price of ~$7 in single quantities IIRC.
Another cool feature is that it's able to bootstrap the 8051 over
the USB bus, so you don't need any PROM's on board.
--
Christer Palm
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