Control Data Corporation 3300 Reference Manual page 108

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The descriptions of BCD numeric items are in the half-word preceding or
following the parameter depending on the code. A one- or two-chapter method
of addressing is indicated by the code (see MASTER Reference Manual for
description of chapters). The word address of a file name is the beginning
address of the File Environment Table entry associated with that file name.
The size and address of a literal are passed as parameters in the same
manner as the size and address of identifiers. When a subscripted identifier
is listed in the ENTER parameter string, the compiler computes the actual
subscripted address and passes it in the appropriate parameter word.
Before control is passed to the routine named by ENTER, the mode of program
execution is automatically relocated to instruction state and, upon return from
the routine, is relocated to operand state.
Refer to Appendix J for ENTER Verb examples.
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