/h
x
This option allows you to specify the 486MIS SCSI ID. The value x
specifies the single-digit decimal address. Valid entries are the numbers
0 through 7. Any other values will be rejected, an error message will be
displayed and the 486MIS SCSI ID will default to 7. If no
/h
option is
present, a default SCSI ID of 7 is used.
This option is never used, because the 486MIS SCSI ID is fixed at 7.
EXAMPLE: /h5
/u and /u-
The
/u
option enables the 486MIS SCSI port to initiate negotiation with
the SCSI target device for synchronous data transfer. The
/u-
option
prevents synchronous negotiation. If synchronous negotiation is disabled
the 486MIS SCSI port defaults to asynchronous data transfer, and it
negotiates for synchronous data transfer if a target device initiates the
negotiation.
Synchronous negotiation is
enabled
by default on the 486MIS board,
because data moves faster on the SCSI bus in synchronous mode. You
may need to disable synchronous negotiation if you have a CD-ROM
drive that does not support it. If your system does not recognize the CD-
ROM drive, or if the drive doesn't work properly, add the
/u-
option to
config.sys
. Then, to assure the best performance on your system,
enable synchronous negotiation on all SCSI devices that
do
support it,
such as fixed disk drives.
If you enter the /u option,
do not
also enter the /u- option, and vice-
versa.
/y and /y-
The
/y
option prevents the 486MIS SCSI from checking SCSI bus parity.
The
/y-
option enables parity checking. If neither option is specified, the
default setting is
/y-
(enable parity checking).
Besure that parity checking is supported by all installed SCSI devices and
is enabled on those devices. (most SCSI devices have a jumper to
enable or disable parity.) If you enter the
/y
option,
do not
also enter the
/
y-
option, and vice-versa.
Page 38 486MIS System Board User's Manual
