SCSI sniffers are certainly available for purchase, but they
are not cheap; a good one is about $1400 or more.
Some SCSI chipsets may be capable of being sniffers, but that is not necessarily true of all of them. I can't tell you for sure about the 1542. However, its chipset is fairly high-level and is a "mailbox" design. Whether you can tell it to sniff the bus or not I do not know. You might possibly have more luck with a 53c8xx chip, which has a much lower-level interface available; you can write "SCSI Scripts" -- essentially, it contains a simple programmable CPU on-board. You aren't the only one interested in this, that's for sure. Post here if you get it working!
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