Add seagate driver manpage from Serge Vakulenko (vak@cronyx.ru) .

Submitted by:	serge

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+.\"Manual pages for FreeBSD Seagate ST01/02, Future Domain TMC-885,
+.\"TMC-950 SCSI driver.
+.\"
+.\"Copyright 1994, Serge Vakulenko (vak@cronyx.ru)
+.\"
+.\"Redistribution and use of this document, with or without
+.\"modification, are permitted provided redistributions must retain
+.\"the above copyright notice and this condition.
+.Dd December 25, 1994
+.Dt SEA 4 i386
+.Os FreeBSD
+.Sh NAME
+.Nm sea
+.Nd
+Seagate ST01/ST02, Future Domain TMC-885, TMC-950 SCSI adapter driver
+.Sh SYNOPSIS
+With explicit memory and IRQ parameters:
+.Cd "controller sea0 at isa? bio irq 5 iomem 0xc8000 vector seaintr
+.sp
+With automatic memory address detection and no IRQ:
+.Cd "controller sea0 at isa?
+.sp
+.Cd "controller scbus0
+.sp
+For each connected disk:
+.Cd "device sd0
+.sp
+For each connected tape device:
+.Cd "device st0
+.sp
+For one or more cdroms:
+.Cd "device cd0
+.Sh DESCRIPTION
+This driver provides access to SCSI devices connected to Seagate ST01/ST02 or
+Future Domain TMC-885, TMC-950 SCSI adapter.
+.sp
+It's possible to use the Seagate ST01/ST02 adapter without IRQ line.
+The data rate then slightly decreases (by 20-30%).
+.sp
+The \fBflags\fP keyword in the configuration file can be used to set
+some adapter driver parameters:
+.sp
+Bits    Description
+.br
+------------------------------------------
+.br
+0x01    Disable SCSI bus parity check.
+.br
+0x02    Place all REQUEST-SENSE SCSI operations ahead of queue.
+.sp
+The original Seagate ST02
+BIOS cannot coexist with IDE or any other disk controller
+because it does not share BIOS disk drive numbers (80h, 81h)
+with others.  The probing code  of the driver allows using ST02 controller
+without BIOS: just unplug the ST02 BIOS chip from the board.
+.sp
+Another problem is the floppy adapter on ST02 which could not be
+disabled by jumpers.  The ST02 adapter it the best as a cheap solution
+for atttaching the tape and CD-ROM drives, and an extra floppy controller
+is just a headache.  There exist a simple workaround: cutting off
+the AEN signal (A11 contact on ISA connector).  AEN then goes high and
+disables the floppy adapter port address decoder.
+.sp
+Some motherboards also have a problem with ST02 conflicting with IDE during
+IDE data write phase.  It seems than ST02 makes some noise
+on /IOW line.  The /IOW line is used only for floppy controller
+part of ST02, and because it's rarely needed, cutting off the /IOW
+(contact B13) will help.
+.sp
+Tested on the following hardware:
+.br
+  Adapter: Seagate ST02
+.br
+     Disk: HP D1686
+.br
+Streamers: Archive Viper 150, Wangtek 5525
+.br
+  CD-ROMs: Toshiba XM-3401, NEC CDR-25
+.sp
+Maximum data rate is about 270-280 kbytes/sec (on 386DX/40).
+.Sh FILES
+.Bl -tag -width Pa -compact
+.It Pa /sys/i386/isa/seagate.c
+driver source
+.El
+.Sh SEE ALSO
+.Xr cd 4
+.Xr scsi 4
+.Xr sd 4
+.Xr st 4