From: thomas@itd.nrl.navy.mil (George Thomas,16/232,47106,5531) Subject: Adaptec 1522 Date: Mon, 28 Jun 1993 19:19:13 GMT
Dear Newsgroup,
I have been vaugely following the discussion about thte 1522, and wish I had
tuned in earlier. I was lucky enough to (a few months ago) talk to a kind person
at Adaptec who sent me ($free) the adaptec 1522 technical manual. I'm not
sure if it is under don't xerox me rules (i'll have to check). Anyways, where
would be the best place to start about writing a driver (I currently run SVR4.2,
and unfortunantly, it don't support the 1522 either, and I am not in the mood to
write a driver for this environment because I can't get enough docs from the
various parties involved to do it properly).
Anyhows...
There are a few advantages I can see right off the bat to a 1522 system, if
you have ISA and more than 16 MB of ram. The 1522 has a 128 byte deep fifo on the
read and write sides of the scsi bus, and can perform quite well under PIO
(you can do 16 bit PIO to the thing, and opposed to 8 bit DMA), which means
you potentially don't need to worry about the buffer copy problem.
Well, those interested, send me some mail, and we'll get this ball rolling.
What would really help me I guess is a copy of the SCSI-2 spec (so I can figure out
the phases and such), and someone who can walk me through SCSI a little bit. I've
heard the SCSI-2 spec is on line somewhere, anyone know?
Later.
George Thomas
thomas@itd.nrl.navy.mil