IBM System/360

Operation
Mnemonic Op Code Format
Operands Description
Interruptions Cond Code
OR
OR
16 RR Rl,R2 The ORed sum of both opr's into opr 1
None
0 Result= 0
1 Result f:. 0
OR
OJ
96
SI Dl(Bl),12
OR the 1 byte from the instruction stream Prot
0 Result= 0
(8-15) to opr 2
Adr 1
Result~ 0
Pack
PACK F2 SS Dl(Ll,Bl),
Change opr 2 from zoned to packed format Prot
Unchanged
D2(L2, B2) and place into opr 1.
Adr
(Right to left byte by byte)
(No restriction on overlapping fields)
(Opr 2 may be extended with hi-order zeros
if opr I too long, thereby inserting zeros in
opr 1.)
Ix ID Is
ID I
I D I D Is I
Read Direct
RDD
85 SI
D!(Bl), I2
The 1 byte from the instruction stream Privileged Unchanged
(8-15) is placed on the timing-signal bus-
Oper
out, in a form of 8 timing pulses, along with
Prot
a 9th pulse at the read-out line. The 8 bit
Adr
lines at the direct-control bus-in lines are
stored in opr 1.
Set Program Mask
SPM
04 RR Rl Opr I (2-7) replaces the cond code and None Set by bits
program mask bits of the current PSW
2 and 3
(34-39)
(Bits 0, 1 and 8-31 are ignored and
unchanged.)
Set Storage Key
SSK
08 RR Rl,R2 Opr 1 (24-27) replaces the storage key Privileged Unchanged
specified by the opr 2
Oper
(Opr 1 bits 0-23 and 28-31 are ignored) Adr
(Opr 2 bits 0-7 and 21-27 are ignored) Spec
(Bits 28-31 must be zero)
Set System Mask
SSM
80
SI Dl(Bl)
Opr 1 (1 byte) replaces the system mask Privileged Unchanged
bits of the current PSW (0-7 ). Oper Adr