parallel port SCSI controller

[Jules]

Has anyone come across a schematic for a PC parallel port SCSI controller?
I think I've got one figured out on paper but I'm surprised nobody's
produced a hobby version already and it seems a shame to reinvent the
wheel.

For my particular application I'm only talking to old SCSI-1 devices so
lack of speed is not a problem - hence I'm hoping I'll be able to get
away with a dumb interface just using a few buffers and latches, rather
than a microprocessor controlled solution with buffering which handles the
SCSI protocol. I don't yet know if I'm going to hit timeout problems
though...

cheers

Jules

 

[Si Ballenger]

On Sun, 30 May 2004 16:34:05 +0100, Jules
<julesrichardsonuk@remove.this.yahoo.co.uk> wrote:

Has anyone come across a schematic for a PC parallel port SCSI controller?
I think I've got one figured out on paper but I'm surprised nobody's
produced a hobby version already and it seems a shame to reinvent the
wheel.

For my particular application I'm only talking to old SCSI-1 devices so
lack of speed is not a problem - hence I'm hoping I'll be able to get
away with a dumb interface just using a few buffers and latches, rather
than a microprocessor controlled solution with buffering which handles the
SCSI protocol. I don't yet know if I'm going to hit timeout problems
though...

cheers

Jules

Some of the older parallel port scanners have cables that
apparently do the parallel port/scsi interface work. You might
find some info in those types of areas.