I have quoted a paragraph below, for context purposes, but there is one passage "...the
same SII chip implements both SCSI and DSSI." which intrigued me.

Is this true?  Is a SII chip actually a SCSI chip just in DSSI mode?  If so, how does one
tell it to go into true SCSI mode?

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Quoted from the Quasijarus http://minnie.tuhs.org/Quasijarus/vaxhw/mscp_clu.html page:
"The first DSSI adapter made was the DEC SII chip. The DSSI physical layer is really
hacked SCSI, and SII is just a somewhat special SCSI chip that can work in DSSI mode.
Although apparently it is hacked significantly enough to make it impossible to use a
standard SCSI chip as a DSSI adapter, the same SII chip implements both SCSI and DSSI. SII
is just as dumb as an off-the-shelf SCSI chip."


John Maier - Administrator
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