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7.2. PLUS Interface
CONWRD$–Condition Word Routine
CONWRD$ is called from PLUS routines by declaring procedures with the appropriate
entry points.
Calling Sequence
The following entry points are defined for CONWRD$:
CWSET$
Call the relocatable version of CONWRD$ and set bit 8 of the condition word; if bit 8
is already set, then set bit 7 (bit 0 is the leftmost bit of the word).
CWCLEAR$
Call the relocatable version of CONWRD$ and clear bit 8 of the condition word; bit 7
is not changed.
CBCWSET$
Call the common bank version of CONWRD$ and set bit 8 of the condition word; if
bit 8 is already set, then set bit 7.
CBCWCLEAR$
Call the common bank version of CONWRD$ and clear bit 8 of the condition word;
bit 7 is not changed.
Example
The following example calls CONWRD$ from a PLUS routine:
1. PROCEDURE SET_TASK_ERROR IMPORTED (‘CWSET$’);
2. PROCEDURE CLEAR_TASK_ERROR IMPORTED (‘CBCWCLEAR$’);
.
.
.
3. SET_TASK_ERROR; " Set bit 8 of Condition Word
.
.
4. CLEAR_TASK_ERROR; " Clear bit 8
In this example, line 1 declares a procedure to call the relocatable version of CONWRD$
and set bit 8 of the condition word. Line 2 declares a procedure to call the common
bank version of CONWRD$ and clear bit 8 of the condition word. Lines 3 and 4 execute
the calls to CONWRD$ to manipulate the condition word.
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