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Date:      Wed, 16 Jun 1999 00:54:25 +0200
From:      Pascal Gienger <finesse@bluewin.de>
To:        freebsd-questions@freebsd.org
Subject:   Problems with AHA 1542CF and cdrecord
Message-ID:  <19990616005425.A479@finesse.paul-magazin.de>

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The other day, I tried to use my old 486/66 with its AHA 1542CF to do
something useful, e.g. burning CD rom disks.
I have a Teac R55S, well supportes by cdrecord.

Access like a cdrom works like charm, but when burning a cd (-dummy and
no -dummy, same effect) it stops at approximately 80 Megabytes and
the SCSI bus freezes. After 40 Seconds (the well known scsi timeout)
things are getting normal again, with a broken cdrecord, of course. :)

It is reproductible. Sometimes it happened after 50 seconds, but normally
it is after 80 or 81 Megabytes of written data.

Speed does not matter. Changing cdr-disks does not help either. Tried
different cables, using parity or no, still no effect.

All SCSI devices use 5,0 Megabyte/sec transfers in sync mode.
My system is a FreeBSD 3.1-RELEASE with 16 Megabytes of RAM (so the bounce
buffers problem does not arise). At the moment of burning, nothing
special runs on the machine.

Any hints (besides "buy a new computer")?
For double-speed burning (300 kbyte/sec to the writer, 300 kbyte/sec from
the disk) the little machine should be enough, it is not Windows...

Pascal
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