Re: RAMFAST rev C & D

[dempson@actrix.gen.nz (David Empson)]

wyeo <willieyeo@gmail.com> wrote:

> On Oct 14, 12:24 pm, Lockar <loc...@nowheretobefound.com> wrote:
> 
> > The only thing I can think of is the SCSI ID.  Are both
> > cards set to 0 or 7?  My hard drives are set at 0 and I don't have the
> > jumpers to set the IDs.  Just wondering if that problem.
> 
> Think the RAMFast SCSI is (default) ID 0 (the computer).
> 
> If that's the case, then your harddisk ID has to change (I can't
> remember if the RAMFast can operate the default ID to another ID).

My recollection is that the RamFAST has no SCSI ID. It doesn't implement
the arbtration phase or disconnect from the drive while waiting for a
command to complete, so there is no need for the drive to be able to
initiate a connection to the host, or know its SCSI ID.

This causes compatibility problems with some later SCSI hard drives,
which require that the host have a SCSI ID, and the host must implement
SCSI arbitration and reconnection.

For a fully compliant SCSI card (e.g. the Apple ones), the convention is
that the computer is set to the highest priority ID, which is 7. This is
the default ID for Apple SCSI cards and the hard-wired ID for Macs.

-- 
David Empson
dempson@actrix.gen.nz