Re: [cc65] Questions for CBM guys

From: Spiro Trikaliotis <>
Date: 2008-02-29 17:48:58

* On Fri, Feb 29, 2008 at 05:36:07PM +0100 Ullrich von Bassewitz wrote:
> If I
> remember correctly, the 1541 has a maximum of three open channels, and one is
> used (and kept open) by the library for the command channel.

The 1541 can keep open at most either 3 sequential files at once, or 1
relative and 1 sequential one.

I *believe* that the command and error channel (15) is special. Whenever
you issue a command (that is, write to it), the command is directly
processed (cf. $C146-$C193 in the floppy code).

Wenn reading the error channel, there is a special buffer area in the
floppy available for this ($02D5-$02F8).

Thus, I believe channel 15 does not count in the picture above. But, of
course, this would have to be verified.


Spiro R. Trikaliotis                               
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Received on Fri Feb 29 17:49:28 2008

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