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GE/PAC 4020 COMPUTER INSTRUCTION SUMMARY
ADDRESSING
CODE
NAME
EXECUTE TIME
REL.
INDEX
OCTAL CODE
ABL
Append Item to Beginning of List
*130.0
x
x
57x*Y
ABT
Abort
***
8. 5
&
26. 5
x
25x3D
ACT
Activate Device
***
8. 5
&
26. 5
x
25x1D
ADD
Add
3.2
x
x
llx*Y
ADO
Add One to Bit K
4.7
x
05x0700K
AEL
Append Item to End of List
*125.0
x
x
47x*Y
AKA
Add K to A
*
6.4
x
60x0K
ANA
AND to A
3.2
x
x
20x*Y
BRU
Branch unconditionally
1. 6
x
x
14x*Y
BTR
Branch if TSTF Reset
1. 6
x
x
30x*Y
BTS
Branch if TSTF Set
1. 6
x
x
34x*Y
CBK
Change Bit
4.7
x
05x4700K
CLO
Count Least Significant Ones
4.7
05004137
CLZ
Count Least Significant Zeros
4.7
05070137
CMO
Count Most Significant Ones
4.7
05004237
CMZ
Count Most Significant Zeros
4.7
05070237
CPL
Complement A
4.7
05010000
DAD
Double Add
* 48.8
x
x
51x*Y
DLA
Double Left Arithmetic Shift
4. 8 - 8. 0
x
45x0644K
DLD
Double Length Load
* 25.6
x
x
41x*Y
DLL
Double Left Logical Shift
4. 8 - 8. 0
x
45x0720K
DMT
Decrement Memory and Test
4.8
x
060*Y
DRA
Double Right Arithmetic Shift
4. 8 - 8. 0
x
45x0440K
DRC
Double Right Circular Shift
4. 8 - 8. 0
x
45x0530K
DRL
Double Right Logical Shift
4. 8 - 8. 0
x
45x0430K
DST
Double Length Store
* 28.8
x
x
63x*Y
DSU
Double Subtract
* 42.4
x
x
61x*Y
DVD
Divide
13.7
x
x
65x*Y
ERA
Exclusive "OR" to A
3.2
x
x
lOx*Y
FAD
Floating Add Single/Double
*203.0/295.0
x
x
70x*Y
FDV
Floating Divide Single/Double
*182. 0/288. 0
x
x
73x*Y
FIX
Fix Floating Number Single/Double
*111. 0/112. 0
x
74x0K
FLO
Float Fixed Number Single/Double
*123.0/145.0
x
74x2K
FMP
Floating Multiply Single/Double
*151. 0/216. 0
x
x
72x*Y
FMS
Floating-point Mode Shift
*208.0
74x3K
FSU
Floating Subtract Single/Double
*208.0/300.0
x
x
71x*Y
IAil
Inhibit Automatic Interrupt
2.2
25030000
IAI2
Inhibit Automatic Interrupt
2.2
25040005
IBK
Isolate Bit K
4.7
x
05x0100K
IN
Input from Device D
***
8. 5
&
26. 5
x
25x5D
INX
Increment Index
4.8
x
x
26x*K2
JCB
Jump Channel Busy
***
8. 5
&
26. 5
25x6D4D
JDR
Jump if Device D Ready
***
8. 5
&
26. 5
x
25x6D2D
JND
Jump if• no Demand
2.2
25040000
JNE
Jump if Device D not in Error
***
8.5
&
26.5
x
25x7D
JNO
Jump
if
No Overflow
2.2
25060000
JNP
Jump if No Parity Error
2.2
25070000
JNR
Jump if Device D not Ready
***
8. 5
&
26. 5
x
25x6D
LBM
Load Bit Mask
4.7
x
05x6300K
LDA
Load A- Register
3.2
x
x
OOx*Y
LDI
Load Indirect
* 35.1
x
x
52x*K
LDK
Load A with K
*
6.4
x
x
40x*Y
LOO
Load One into Bit K
4.7
x
05x0300K
LDP
Load Place
3.2
x
x
15x*Y
LDQ
Load Q-Location
4.8
x
x
42x*Y
LDX
Load Index Word
4.8
x
x
16x*Y
LDZ
Load Zeros into A
4.7
05000000
LMO
Load Minus One
4.7
05060000
LMR
Load API Mask Register #1
2.2
25000302
LMR2
Load API Mask Register #2
2.2
25000300
LPR
Load Place and Restore
3.2
x
x
35x*Y
10
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