U UNIVAC 1218 - Bitsavers

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instruction will transfer a word whether the buffer
is active or not. The transfer takes place under
control of the output buffer control registers.
EXTERNAL FUNCTION OVERRIDE (EXFOV)
Execution time: 4.67 microseconds
Wait for the output device to accept the word in the
C register(s). Then simulate an external function
request on channel k and transfer the word designated
by the address in the external function buffer control
register for that channel. Ignore the ESI mode if active.
This instruction will transfer a word whether the buffer
is active or not. The transfer takes place under control
of the external function buffer control registers.
5. MISCELLANEOUS I/O INSTRUCTIONS
The instruction repertoire includes the following instructions which are useful
in programming the transfer of information between the computer and peripheral
deviceso
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SET RESUME (SRSM)
Execution time: 4 microseconds
Set the resume designator for channel k group to
permit honoring the next requesting output function
on that group. Loss of any information currently
held by that output register(s) for a peripheral
device is allowed by this instruction.
SKIP ON INPUT INACTIVE (SKPIIN)
Execution time: 6 microseconds skip; 4.67 no skip
Test for input activity on channel k. If inactive, skip
the next instruction; otherwise, take the next instruction.
SKIP ON OUTPUT INACTIVE (SKPOIN)
Execution time: 6 microseconds; 4.67 no skip
Test for output activity on channel k. If inactive, skip
the next instruction; otherwise, take the next instruction.
SKIP ON EXTERNAL FUNCTION INACTIVE (SKPFIN)
Execution time: 6 microseconds skip; 4.67 no skip
Test for external function activity on channel k. If
inactive, skip the next instruction; otherwise, take the
next instruction.
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