User`s guide

SET DUx
(DU)
Defines how an MSCP disk is partitioned.
Format
SET DUx condition
Condition
CSRy=n
(Valid only if the handler is assembled for multiple ports) Modifies the DU
handler to use n as the CSR address for DU controller y. The variable y is
an integer in the range 0–3, with 0 being the default value. SET CSR0=n is
equivalent to SET CSR=n.
PART=n
Defines the partition of a disk on which device unit x resides. The variable n
is an integer in the range 0–255, depending on the size of the disk device (each
partition is 64K blocks). The default for n is 0.
SET DUx PART=n assigns DUx to disk partition n. (See the RT–11 Volume and
File Formats Manual for more information on disk partitioning.)
PORT=n
Assigns DUx to MSCP port n. The variable x has a default range of 0–7, with
0 being the default value. If you have assembled the DU handler for extended
units, the range is from 0 to 64
10
. You specify an extended DU device unit in the
format Dxx, where xx is a number from 0 through 77
8
.
The variable n (specifying the port) is an integer in the range 0–3, with 0 being
the default value. (See the (dev_book) for more information on using multiple
ports with MSCP devices.)
UNIT=n
Defines which unit plug number to access when device unit x is specified. The
variable n is an integer in the range 0–251. The default setting defines n equal
to x.
VECy=n
(Valid only if the handler is assembled for multiple ports) Modifies the DU
handler to use n as the vector address for controller y. The variable y is an
integer in the range 0–3, with 0 being the default value. SET DU VEC0=n is
equivalent to SET DU VECTOR=n.
RT–11 Command Descriptions 227