Re: C64 Kernal disassembly question

From: Adrian Gonzalez (
Date: 2004-05-20 02:18:44

Howdy guys

At 10:52 AM 5/19/2004, you wrote:
>True, I haven't published them.  I would need a volunteer to find out what
>goes wrong when sending commands to a 1541.  The C2N232 can emulate a
>peripheral nicely (LOAD, SAVE, OPEN, CLOSE, GET#), but for some reason, the
>1541 doesn't behave when the C2N232 acts as a controller.  I wouldn't like
>to release non-working code, but on the other hand I don't have the resources
>(3-channel storage oscilloscope or logic analyzer) to analyze the problem.

I have a home-made logic analyzer that I've used to analyze the IEC 
protocol.  IIRC the C2N232 uses an at90s2313 at 8mhz?  I believe I have a 
2313 I can spare to build a cn232.  I don't really need the connections to 
the c64's tape port for this right?  (except maybe vcc/gnd?).  I have some 
serial(iec) connectors I can hack up for the job but nothing to plug into 
the tape connector.

If I do this, what should I try to sample?  read the command channel?  load 
a file?  My analyzer only has 128k of ram which are good for some 128mS at 
about a sample per cycle.  I could sample a little slower if necessary though.


p.s. Yes, I'm working on a IEC<->rs232 project as well :)


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