U UNIVAC 1218 - Bitsavers

1. GENERAL
SECTION 1-8-7. SKIP AND STOP INSTRUCTIONS
Skip instructions are used to skip one instruction and then continue in sequence.
The stop instruction permits programmed stops in a running program. The instructions
which follow provide the means for programming both conditional
and unconditional skips and stops.
2. INSTRUCTIONS
50 21 SKIP ON INPUT INACTIVE (SKPIIN)
Execution time: 6 microseconds skip; 4.67 no skip
Test for output activity on channel k. If inactive,
skip the next insturction; otherwise, take the next
instruction.
50 22 SKIP ON OUTPUT INACTIVE (SKPOIN)
Execution time: 6 microseconds skip; 4.67 no skip
Test for output activity on channel k. If inactive,
skip the next instruction; otherwise, take the next
instruction.
50 23 SKIP ON EXTERNAL FUNCTION INACTIVE (SKPFIN)
Execution time: 6 microseconds skip; 4.67 no skip
Test for external function activity or channel k. If
inactive, skip the next instruction; otherwise, take
the next instruction.
50 50 SKIP ON KEY SETTING (SKP)
Execution time: 6 microseconds skip; 4.67 no skip
If bit 4, 3, 2, 1, or 0 of k is one and the corresponding
skip key 4, 3, 2, 1, or 0 is set, or if bit 5 of k is
a one (unconditional skip), skip the next instruction.
Otherwise, take the next instruction.
Examples of skip with:
k = 01 (bit 0) skip if skip key 0 is set
k = 02 (bit 1) skip if skip key 1 is set
k = 04 (bit 2) skip if skip key 2 is set
k = 10 (bit 3) skip if skip key 3 is set
k = 20 (bit 5) skip if skip key 4 is set
k = 40 (bit 5) skip unconditionally
k = 03 (bits 1, 0) skip if either key 1 or 0 is
1-8-37
set