2.4.6I/O unit
The I/O unit facilitates inserting and ejecting cartridges without inter- rupting normal processing (☞ Figure
Figure 2-5: I/O unit/E
2.5Cartridges
Each cartridge in the AML/J system can have an external user and machine readable label for identifying the Volsers (Volume Serial Number). The external label contains between one and 16 characters for the Volser. The Volser is composed of the uppercase letters