From: Adrian Gonzalez (adrianglz_at_globalpc.net)
Date: 2004-05-21 13:02:11
Marko
Ok, I have a working c2n232 now, or at least the IEC part
>Excellent! I've made the code from December 11 available at
><URL:http://www.funet.fi/~msmakela/c2n232i.s>. The file has the wiring
>information:
After having somewhat of a painful time finding the right tools to
assmemble the file, I managed to do it and got a .hex ready to load into
the 2313... :)
>You'll need to wire the serial line (RxD, TxD, CTS, RTS) to a MAX232
>to enable in-system programming with my CISP tool, and communications
>when the system is running. See the schematic in
>http://www.funet.fi/pub/cbm/crossplatform/transfer/C2N232/hardware/smdcr.zip
>for a reference design. It's now also in PNG format, if you don't want to
>or can't install Eagle.
I built my c2n232 on top of an Atmel starter kit (stk-500), which really
simplified things. There's a max232 already on board along with headers
for the port pins, where I wire-wrapped connections to a IEC
connector. The board also lets you program the microcontroller via a rs232
interface and Atmel's AVR Studio software, so I didn't need to do the ISP
part either.
>First, you should check that SAVE and LOAD works. I have some notes on
>how to do this somewhere, but I can't find them right now.
I managed to test the firmware using a term program at 38400 bps and
sending the 'pay attention to serial bus' command. I was able to see the
characters that I sent on the command channel from the c64, so everything
seems to be working fine.
I'm kinda stuck now though. What exactly am I supposed to be running on
the 'big' computer side?
I assume it's different programs to act as a slave device or as a bus
master/controller?
-Adrian
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