DATA 620/i SYSTEM REFERENCE MANUAL . - Al Kossow's Bitsavers

JBZM
Jump and Mark if B
Register Zero
Timing: 2-3 cycles
n
n+1
17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
r-T -
I I
~-+
I I
r-.L -
~-b it
option
-
00 2 020
I
I I
Jump Address
If the B register is zero, the contents of the instruction counter
(P) are placed at the jump address, and the instruction at the
jump address plus one is executed. If the B register is not zero,
the next instruction in sequence is executed.
Indexing: No
Indirect Addressing: Yes
Regi sters AI tered: Jump address, P
I JXZM I Jump and Mark if X Timing: 2-3 cycles
Register Zero
n
n+l
17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
r-T-
I
I I ~-+
00 2 040
I I
I I
Jump Address
~1
18-bl!..
option
I
If the X reg ister is zero, the contents of the instruction counter
(P) are placed at the jump address and the instruction at the
jump address plus one is executed. If the X register is not zero,
the next instruction in sequence is executed.
Indexing: No
Indirect Addressing: Yes
Registers Altered: Jump address, P
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