[Coco] [Color Computer] Re: USB Anyone?

[j_e_daggett]

Been there done that.

What USB device do you wish to interface to the Coco? Mouse, Keyboard,
printer?

I have a layout done and can have three proto type boards with no
solder mask and  no silkscreen by Wednesday next week. Cost of $20 per
board. The card is a plug in card to teh Coco expansion buss and is
2.5 in by 3.8 inch in size. I will have to route/cut the boards to
shape. The boards are two layer plated through holes. 

Currently I do not have the room to set up my Coco 3 and test any
software. I can finish the VHDL logic to program the CPLD. Compile it
and and program the CPLD. The board has provisons to reprogram the
CPLD in circuit. 

james
 

--- In ColorComputer at yahoogroups.com, "James Diffendaffer"
<jdiffendaffer at y...> wrote:
> 
> Anyone interested in a USB interface?
> 
> I sat down today and figured out what it would take and it's not a big
> deal hardware wise.  1 USB chip, 1 USB connector, some caps, some
> resistors, 1 zener diode, a 12 MHz crystal, 1 Transistor, a couple
> LEDs (optional), a couple logic chips and some capacitors.  Most of
> the parts are for the clock circuit and +3.3V power for the chip.
> 
> Their are a some differences in the CoCo buss/address logic from the
> sample but that's minor... just generate separate read and write
> signals from the R/W* line, invert some logic... stuff like that. 
> 
> I'm already entering the schematic but the big question is what
> addresses to use and should I include some other stuff like Flash so
> you can boot from it?  I could include generic drivers for keyboard,
> joystick and drives at boot time.  If a device is plugged in... patch
> the vectors to read from the device.





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