IBM 3590 - Manual (Page 82)

– The ACF is initialized so the top cell of the magazine is considered the
current cell location.
v Enabling conditions: Two ways to enable System mode follow:
– Select Start ACF on the operator panel if there is a loadable cartridge in
the magazine.
– Insert a cartridge in the import position of the priority cell.
v Disabling conditions: The ACF becomes disabled in System mode as
follows:
– A magazine or priority cartridge is processed and returned to its original
cell. There is no cartridge in the import position of the magazine or
priority cell.
– The ACF is enabled because the operator chose Start. And the ACF
cannot detect a cartridge in the import position in either the magazine or
the priority cell.
– An attention condition is detected in the ACF; for example, extra
cartridge condition.
v Operation:
1. If the ACF is disabled and in System mode, and the operator chooses
Start on the operator panel, the ACF then becomes enabled. It then
verifies that there is at least one cartridge in the import position of the
magazine. If so, the ACF indexes down the magazine until it finds the
first cell with a cartridge in the import position. The ACF sets the
cell-status indicator LED for that cell to in-use (steady green) and moves
the cartridge from the cell to the device.
2. If the ACF is disabled, in System mode, with a cartridge placed in the
priority cell import position, the ACF loads the cartridge in the device.
It then sets the cell-status indicator LED to in-use (steady green) for the
priority cell.
3. The ACF sets the cell to in-use if a cartridge is placed in the priority cell
while the ACF is enabled and in System mode. The cell-status indicator
LED is (steady green). When the ACF completes its current operation, it
automatically loads the priority cell as described in step 2.
4. When the system completes processing a cartridge, it issues a Load
command. The ACF unloads the old cartridge and returns it to its
original cell, if possible, and turns off the in-use indicator LED for that
cell. The ACF waits in enabled state until it receives a Load command
or until a cartridge is inserted in the priority cell. In the case of the Load
command, the ACF searches the magazine for the next cell in the import
position and loads it to the device. This process repeats until the ACF
cannot find another cartridge to load.
62 3590 Operator Guide