Thomas Tewell thomas.tewell at
Thu Mar 2 13:08:50 PST 1995

I've been looking over the SPI document and it would appear that it 
states that legacy and SCAM devices cannot be mixed on the SCSI bus. 
Is this correct? I've been to several 'plug and play' meetings where 
much discussion has taken place concerning the proper actions for 
mixing the device types on the bus.

Specifically B.3.1 Configuration requirements states:

"a) SCAM intolerant devices (i.e. legacy SCSI devices which are not 
SCAM tolerant) are not permitted on the bus."

Does "SCAM tolerant" imply that devices that do not misbehave during 
the SCAM protocol are allowed on the bus or that all legacy SCSI 
devices are precluded from playing on the bus? The definition states 
that "SCAM tolerant" means "An SCSI device which does not implement 
the SCAM protocol but which complies with certain requirements 
specified by this annex."

How likely is this? Is there anyone testing devices for SCAM 
tolerance? It seems to me that there is going to be a GREAT deal of 
confusion from the end-users about SCAM. I'm a bit worried that the 
computer media pundits will rip SCAM to shreds if we are not very, 
very specific about this issue...

Thomas "Rick" Tewell

Sequoia Advanced Technologies, Inc.  TEL: (415) 459-7978
55 Shaver Street, Suite 240          FAX: (415) 459-7988
San Rafael, CA 94901                 BBS: (415) 459-7977
U.S.A.                             EMAIL: thomas.tewell at

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