IBM 1130 User Manual page 467

Section
Subsections Page
60
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I
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restraint is that a two-drive system may only have
physical and logical numbers 0 and 1; a four-drive
~ystem, 0, 1, 2, and 3; etc.
You assign logical drive numbers when you
prepare a Job card. The Job card may contain a
series of five four-digit numbers, representing the
ill
numbers of each cartridge (each cartridge must
be given a four-digit ID when it is initialized). The
first of the five ID's (cc 11-14) informs the Monitor
that logical drive 0 is to be the drive containing
the cartridge with that
ill.
For example, if this
field contained 1234, the drive in which cartridge
1234 is mounted becomes logical drive O. That
cartridge may be physically located on any drive;
its actual position does not matter.
Cartridge 1234 would also become the master
cartridge, since the cartridge on logical drive 0
will always be the master.
For further detail, see the Monitor reference
manual.