User Guide

5-6 Ampex 1308910-01
Model No.
Running Head
ACL Utilities Overview ACL Application Programmer’s Guide
DST 812 ACL
5.2.8 Environment
All ACL utilities use the following environment variable.
$ACL_DEV
Specifies the device special file to use when you omit the -f <device_special_file> option.
IMEX Bins The two IMEX bins enable the operator to insert and remove tape cartridges.
The bins are named P10 through P11. Their addresses are 10 (bottom IMEX
bin) and 11 (top IMEX bin). See Figure 3-1 on page 3-4 for address
assignments.
Tape Drive(s) The ACL can contain up to four tape drives. The drives are named T103
through T100 (from top to bottom). Their addresses are103 (top drive)
through 100 (bottom drive). See Figure 3-2 on page 3-5 for address
assignments.
CHS The ACL cartridge handling system is named R1. It comprises the
assemblies necessary to transfer tape cartridges between the storage bins,
IMEX bins, and tape drive(s). Its address is 1. See Figure 3-2 on page 3-5 for
address assignments.
Storage Bins The ACL contains 248 storage bins. The bins are arranged in an 8-column by
32-row matrix (which also contains eight import/export bins). The rows are
numbered 01 through 32 from top to bottom and the columns are
alphabetized A through H from left to right (see Figure 3-2 on page 3-5).
The storage bin names correspond to the locations they occupy. The
addresses are assigned in the following sequences:
Location Names Location Addresses
S1000 1000
S1001 1001
. . . . . . . . .
S1247 1247
IMEX Bins The eight IMEX bins enable the operator to insert and remove tape
cartridges. They are named P10 through P17 corresponding to the locations
they occupy (see Appendix B). Their addresses are 10 (bottom IMEX bin)
through 17 (top IMEX bin). See Figure 3-2 on page 3-5 for address
assignments.