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Obsolete Entry Points, PROCs, and Routines
E$FLD(15)–Set Field
The set field function is used to specify a subfield of the next word to occur
(presumably decimal, octal, binary or alphanumeric character function). The t-field
specifies the left margin and the m-field the right margin. The bits of the machine
word are numbered, for the purposes of this function, from left (00) to right (35).
The d-field specifies extension of sign; if it is nonzero, the field is treated as sign.
A set field function with d=0 and t=0 may be used to treat fields, including the sign
bit, as unsigned unless m=35. (That is, a whole word must always be signed in the
event a sign is applied.)
The set field function remains in effect only for the next function encountered.
If both a set field and a set point function are in effect when editing occurs, the set
field function is applied first. In this case, the set point function specifies the binary
point counting from the right-hand end of the specified field.
E$INDX(16)–Set Index
The set index function is used to address a quantity in main storage that is to be
loaded into the single simulated index register. For any function that addresses
storage (including this one), the presence of a 1 bit in the increment (h) portion of the
address causes the simulated index to be added to the specified address before
access is made. The left half of the index register word is ignored. If the d-field is
nonzero, the contents of the m-field (with sign extension) are loaded into the
simulated index register. The set index function remains in effect until it is
countermanded by another set index function.
E$OVRP(17)–Overpunch
The overpunch function specifies that any minus signs produced by the editing
functions are to be removed from their positions in front of the edited numbers and
placed as 11-punches over the low-order digits. In the case of floating-point editing,
the sign of the mantissa is placed over the low-order digit of the mantissa and the
sign of the exponent over its low-order digit. The space that would normally contain
the sign of the exponent is omitted.
The overpunch function is initiated by its occurrence with address 1. It is
countermanded by its occurrence with address 0. Upon initial entry to EOUT$,
the overpunch mode is assumed to be off.
J.3.4. Control Functions
The control functions introduce some of the control operations available in machine
language into the interpretive language. The number in parentheses following the
procedure call is the octal function code.
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