Re: VIC-1541 problem

From: Marko Mäkelä (
Date: 2006-12-16 11:06:51

On Sat, Dec 16, 2006 at 12:02:20AM -0600, ray wrote:
> Andrew
> Wasn't that what I suggested as the first thing to try - even though  
> others just pooh-poohed the suggestion?

Yes, my bad.  I haven't used older 1541 firmware than the 901229-05.
About 10 years ago, when I collected firmware images for archival,
I compared them.  The only difference I considered essential back then
was the auto-boot feature (automatic execution of the "&*" command when
the CLK and DATA lines are held low).

There must be some difference in the serial bus timing, then.  I just
reviewed the state diagram I sketched 3 years ago when implementing the
serial bus protocols for the C2N232.  I can't come up with any obvious
explanation of the hang.  I guess it's time to compare the hexdumps
and fire up the disassembler again.  And finally find out which
parameters are affected by the UI- and UI+ commands.


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