IBM System/370 145 Reference Summary page 25

II
ARITHMETIC WORD CHART SELECTION
10-Type Arithmetic
Fullword Version
START
10-Type Arithmetic
Byte Version
11-Type Ar1thmet1c
Byte Version
ADDRESS FORMATION CHART
No
10- or 11 Type Anth·
met1c Indirect-Byte
Version
Byte Cl
0 1 2 3
Special direct access
of SPTL
PJ
Lme5
X Direct Local Ston:oge Word Addresi
0 lnd1feCt Local Storage Word Address
Start Decode
1ndtrectbyte
The flow chart •r.:J•cates which lme m the
addressformat1oncharttouse
Otre<t L'>
j lm<•I
I
i
t~E.:~:7~:::, 1 , : • : : : : : : : : ~ ' q e
l_
drt'W1 ll<•l•"1<>1hude
«rop11<>nnff,p,u1dOO
ln<.11 •l<>"lllP '" Chdl)ter
'ul lhN><y M~1n1~ndnre
M,m,.,,1
Local Storage or External Word '
Address Decode Byte•
Note
'
0 0
P6
0
I,
Cl or C2
Note C1 or C2
2rr
CONTROL WORD CHART SELECTION
Note 1
Refer to the Expanded local-storage description
tn
Chapter 2 of Theory-Maintenance Manual
X 0 lndorect Word - lndorec1 Byte
co
N<;rn r!ior ~ Note 2 C1 or C2 bit 3
1s
ORed with bit 3 of the L-reg1ster
X Spec.al External Registef Set S P T L
0 Indirect Local Storage Word Address
0 Direct Word 1 - lndorect Byte
1 0 Dorect Word 2 - !nd1rnct Byte
1 External Registers B groups of seven words
PO
T6 _J_ T7
~­
~
~
''~
,__c.--'
~,,._c.,-2
_ _,_T_4
or~
T6 T7
1--c.--' _,,,_c,'_+-T-4
-~~
T6
_j_
T7
Cl or C2
For source addressing, C1 bns apply to A local storage, Expanded
local storage, or External registers
For source addressing, C2 bits apply to B local storage, or Expanded
local storage
For destination addressing, C1 and C2 bits apply to A and 8 local
storage, Expanded local storage, or External regrnters
1.16