[Coco] Time for that CoCo 3 ethernet card! Twitter access on the C64.

Mark McDougall msmcdoug at iinet.net.au
Mon Jun 15 19:46:38 EDT 2009

jdaggett at gate.net wrote:

> I have a copy of Gary's work before his webpage went down. Yes it can be 
> fairly easily ported to any Xilinx FPGA if you want the basic ROMs internal 
> to the FPGA. External ROMS would require some modification if you 
> wanted to go into a smaller FPGA. 

Thanks James, but I too have a copy and have ported it to an Altera EP2C35 
(Cyclone II) board. I had to mangle the use of SRAM to target hardware with 
a single 16-bit wide SRAM. I also hooked it up to a Gamecube controller to 
emulate the Coco analogue joystick.

Unfortunately, there are one or 2 serious compatibility issues that prevent 
a lot of games from running. I believe that nested GIME interrupts is one of 

I was working on a project based on Gary's design but rather unfortunate 
circumstances has sadly put that on hold atm.


|              Mark McDougall                | "Electrical Engineers do it
|  <http://members.iinet.net.au/~msmcdoug>   |   with less resistance!"

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