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- From: terry@cs.weber.edu (A Wizard of Earth C)
- Subject: Re: What is this scsi controller?
- Message-ID: <1993Jan24.000750.12225@fcom.cc.utah.edu>
- Sender: news@fcom.cc.utah.edu
- Organization: Weber State University (Ogden, UT)
- References: <1009321.23560.12980@kcbbs.gen.nz>
- Date: Sun, 24 Jan 93 00:07:50 GMT
- Lines: 52
-
- In article <1009321.23560.12980@kcbbs.gen.nz> dgd@kcbbs.gen.nz (David Dix) writes:
- >
- >Can anyone help me with information on this scsi controller?
- >
- >It is an ISA bus 16bit short card from 3Com Corporation and has SCSI PLUS
- >ASSY 6175-00 REV A markings. It has an external 50 way centronics type
- >socket and an internal 50way idc type socket. There are are two large
- >chips, a WD33C93-PL 40pin dil type, and a square plc type in socket
- >with L1A1287, 1880-00, LINK+, TAG 8915, and 8471 HONG KONG markings.
- >
- >I would like to get some programming information if at all possible
- >and find out if it is a bus mastering type scsi controller.
- >Does anyone know if it is compatible with any other scsi controller?
- >I would like to try and get it working with 386BSD unix.
-
- The Am33C93A (it's probably an A if it's a recent board) is a product of
- American Micro Devices. This is the chip used in the WD7000-ASC and
- the WD7000-FASST and WD7000-FASST2 controllers. Documentation is
- available in the communications parts book from AMD.
-
- Whether your controller is bus-mastering depends on it's native
- intelligence above and beyond this chip. Specifically, the WD7000 series
- has a Z80. It is the programming in the ROMs on board the card which allow
- you to indicate by convention which command of those available in it's ROMs
- that the 7000 will execute. The command protocol is defined by Western
- Digital, who produced the ROMs.
-
- In your case, you will have to contact 3Com for programming information;
- this may be difficult to get out of them, given their reluctance to
- support the 3C501 in the past... it depends on how old the board is.
-
- Knowing that you have a Am33C93A chip won't do you much good unless there
- is a pass-through mode or a direct access interface on the controller.
- Don't bet on the first (the WD7000 happens to have one), and if the
- second is true, don't expect bus-mastering from a raw chip interface;
- expect to have to take an interrupt and do a copy from a shared store
- instead (ie: you do the DMA).
-
- Either way, you are probably out of the water without 3Com docs.
-
-
- Terry Lambert
- terry@icarus.weber.edu
- terry_lambert@novell.com
- ---
- Any opinions in this posting are my own and not those of my present
- or previous employers.
- --
- -------------------------------------------------------------------------------
- "I have an 8 user poetic license" - me
- Get the 386bsd FAQ from agate.berkeley.edu:/pub/386BSD/386bsd-0.1/unofficial
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