GA21-9194-3_IBM_3741_Models3and4_ProgrammableWorkStation_ProgrammingReferenceManual

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G421-9194-3

IBM 3741
Models 3 and 4
Programmable Work Station
Programming Rebrenc,e
Systems Manual

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Preface

T h i s m a n u a li s p r i m a r i l yi n t e n d e df o r r n a r k e t i n g e p r e s e n t -
r Related Publications
a t i v e s ,s y s t e m s n g i n e e r sp r o g r a m m e r sa n d o p e r a t o r sw h o
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d e a lw i t h t h e I B M 3 7 4 1 M o d e l s3 a n c j4 p r o g r a m m a b l e . IBM 3741 Models 3 and 4 Programmattle Work Station,
W o r k S t a t i o n . T h e r e a c k - srh o u l d b e f a m i l i a r w i t h d a t a p r o -
' General ln formation, GA2 1-9196.
c e s s i n g o n c e p t sa n d t h , : o p e r a t i o no f t h e I B M 3 7 4 1 M o d e l s
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and 2 Data Station. . IBM 3741 Data Station Operator's Gude. GA21 9131.

The manualisdivided into the following chapters: . IBM 3741 Data Station ReferenceManual. GA21 9183.

Chapter l. lntroductio,r providesgeneral information about . IBM 3741 Models 3 and 4 Programmaltle Work Station
t h e o v e r a l l s t r u c t u r ea n t l n e w f u n c t r o n so f t h e w o r k s t a t i o n R eference Card, GX21 -92O4.
andthe ACL (application ontrollanguage). c
The real nleasure... A Prograntmer's,Desigrr C:uideto
Chapter 2. Referencell\aterial provides specific informa-
tlte IBM 3741 Models 3 ancl 4 Progran',,nable ll/ork
t i o n a b o u t t h e c o n t r o l : t a t e m e n t sa n d i n s t r u c t i o n so f A C L
S t a t i o n s ,G A 2 1 - 9 2 2 5 .
u s e d i n p r o g r a m m i n gt h e w o r k s t a t i o n .

A Programmers lntroduction to the Application Control
Chapter 3. Design and lrnplernentation Considerations pro-
L a n g u a g eG 4 2 1 - 9 1 9 5 .
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v i d e sd e t a i l e d i n f o r m a t i o n a n d e x a m p l e sr r f A C L u s e d i n d e ,
s i g n i n ga n d i r n p l e m e n t i r r g p p l i c a t i o np r o g r a m s .
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Application Control Language Support Logic Alanual,
sY21-9203.
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o p r a t o r p r o c e c l u r ea n r l i n t e r a c t i o nw i t h t h e w o r k s t a t i o n .
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a IBM 3740 BTAM/TCAM Prograntner'sGuide,
A p p e n d ix e s p r o v i d ed e l a i l e d s u p p l e m e n t a r yi n f o r m a t i o n . GC21-5071.

F o u r t h E d i t i o n ( O c t o b , r r1 9 7 7 )

This is a major revision oi, and obsoletesGA21-9194 2 and Technical Newsletter
GN21-0244. Changesare irrdicatedbV a vertical tifieat the left of the change; new or
e x t e n s r v e l Vr e v t s e d i l l u s t r a t i o n s a r e d e n o t e d b y a b u l l e t ( o ) a t t h e l e f t o f t h e f i g u r e
caotron.

C h a n g e s a r e p e r i o d i c a l l y t r a d e t o t h e i n f o r r n a t i o n h e r e i r r ;a n y s u c h c h a n g e s w i l l b e
reported in subsequent revisionsor technrcal newsletlers.

R e q u e s t s f o r c t > p t e s f l B l r i l p u b l i c a t i o n s s h o u l d t l e m a d t o v o u r l 8 M r e p r e s e n t a t i v eo r
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to the IBM branch office servingyour locality.

A Readers'Comment Forrr is at tne back of this publication. lf the form has been
r e m o v e d , a d d r e s sy o u r c o r n m e n t s t o I B M C o r p o r a t i o n , P u b l i c a t i o n s , D e p a r t m e n t 2 4 5 ,
Rochester, Minnesota 559'J1 .

OCopyright f n t e r n a t i o n a l [ ] u s i n e s sM a c h i n e : C ) o r p o r a t i o n , j 9 7 4 . ^ , 9 7 S . j g l 7
Contents

CHAPTER 1. INTRODUCTION 1 S EL F . C HE C K
C r e a t i n ga S o u r c e P r o g r a m 1 C o l u m n s 1 - 1 1 C o n t r o l S t a t e m e n tN a m e ( R ) . Itr
3741 Models3 and 4 Architecture C o l u m n s1 3 1 5 M o d u l u s1 R ) 15
A C L P r o g r a mO p e r a t i o n 4 C o l u m n s 8 - 1 9D i g i t P o s i t i o n O )
1 ( t 5
Branching 4 C o l u m n s2 3 - 2 5 A l g o r i r h m C o n t r o l 15
D a t a S e t A c c e s sM e t h o d s C o l u m n 2 4 S u m M a n i p u l a t i o n( O ) 16
Table Operations 4 C o l u m n 2 5 C o m p l e m e n t{ O ) 16
S e l f - C h e c kn g
i 5 C o l u m n s2 8 - 3 0 D i g i r l / O C o n t r o l 16
Displayand Keyboard C o l u m n s3 3 - 3 4 I n p u t T r a n s t a t e a b l e B u f f e r N u m b e r ( O ) .
T 17
Reformatting and Editing q
C o l u m n s3 8 - 3 9 P r o d u c tT a b l e B u f f e r N u m b e r ( O ) 17
C o l u r n n s4 3 - 4 4 O u t p u t T r a n s l a t eT a b l e B . u f f e rN u m b e r ( O ) 18
C H A P T E R2 . R E F E R E N C E A T E R I A L
M 6 C o l u r n n s 8 6 3 W e i g h t i n gF a c t o r s( O )
4 18
Control Statements tt C o l u m n 6 8 W e i g h r i n gF a c t o r sR e g i s t e r O )
( 19
.NAME 6 Self-Check xamples E 19
C o l u m n s1 - 5 C o n t r o l S t a t e m e n tN a m e ( R ) 6 M o d u l u s7 '19
C o l u m n s 1 3 - 1 6 P r o g r a mN a m e ( O ) b , RE GI S TE R 20
C o l u m n s1 8 - 1 9 P r o g r a mO r i g i r rB u f f e r ( R ) o C o l u m r r s - 9 C o n t r o l S t a t e m e n tN a m e ( R )
1 20
C o l u m n 2 3 P r i n t e rT y p e ( R ) C o l u n r r r1 3 [ : l e g t s t eN a m e ( R )
r
I 20
C o l u m n s2 8 - 3 OP r i n t F o r m S i z e ( O ) 7 C o l u m n s 1 8 - 3 3 R e g i s t e r o n t e n t s( R )
C 20
C o i u m n s3 3 - 3 5 P r i n t e rO v e r fl o w L r n e N u m b e r ( O ) 7 .BUFFIR 21
C o l u m n s 3 8 - 4 OD e c i m a l a n d C o m n r a n d E d i t C o n t r o l { O } 7 C o l u m n s 1 7 C o n t r o l S t a t e m e n tN a m e ( R ) 21
C o l u m n s4 3 - 4 4 E d i t C u r r e n c yC h a r a c t e r sO )
( 1 C o l u r n n s 3 l 5 B u t { e rN u m b e r( R )
1 21
C o l u m n 4 8 P r o m p t i n gR e g i s t e r O )
( 7 Designated ulfer Load (R)
B 21
C o l u m n 5 3 P r o o f K e y b o a r d( O ) 7 ,FOt]MAT 22
C o l u m n s 5 4 - 5 5 K e y b o a r d D e s i g n a t i o n( O ) 7 C o l u m n s 1 - 7 C o n t r o l S t a t e m e n tN a m e ( R ) 22
C o l u m n 5 8 M a c h i n eS i z e ( O ) ' . 1 C o l u m n s1 3 ' 1 5 N u m b e r i R ) 22
C o l u m n s6 3 - 7 0 l n t e r m e d i a r e a t a S e t N a m e ( O )
D 7 C o l u r n n s1 8 - 2 0 C h a r a c t e r o s i t i o n( O )
P 22
C o l u m n7 1 D r i v eN u m b e r ( O ) . 8 Colrrrnn 3 Character O)
2 { 22
C o l u m n s7 3 0 O b . i e c t a t a S e l N a m e ( O )
D R C o l u r n n2 8 S e c o n dR e c o r d ( O ) 22
C o l u m n8 1 D r i v eN u m b e r ( O ) Data ilirected Formatting
d
23
.DATASET I F o r m a i l i n qB l o c k e dR e c o r o s 23
C o l u m n s 1 - 8 C o n t r o l S t a t e m e n tN a m e ( R ) o F o r m a t t i n gR e c o r d sG r e a t e rT h a n 1 2 8 C h a r a , c t e r s 23
C o l u m n 1 3 D a t aS e t N u m b e r ( R ) 8 Edrtrng 1a
C o l u m n s1 8 - 2 5 D a t a S e t N a m e ( R ) B Data Movement 25
Columns 28-30 Record Length (O) B FIELD 25
C o l u m n3 3 D r i v eN u m b e r ( R ) . 8 C o l u m n s 1 - 6 C o n t r o l S r a t e m e n tN a m e ( R ) z5
Columns 38-39 Data Set Input/Output Buf fer ( R ) I C o l u m n s1 3 ' 1 4 B u ff e r ( R ) 25
C o l u m n s4 8 - 5 1 D e l e t e dR e c o r d R o u t r n e( O ) I C o l u n r n si 8 - 1 9 O v e r f l o w B u f J e r( O ) 25
C o l u m n s5 3 - 5 6 E n d - o f - F i l e o u t i n e ( O )
R 9 C o l u n r n2 3 F i e l c l y p e ( R ) .
T 26
C o l u m n s5 8 - 6 0 T y p e ( R ) 10 C o l u m n s2 4 - 2 5 F i e l d L e n g t h ( R ) zo
C o l u m n6 1 E x t e n t C h e c k( O ) 13 Cclumn 28 DataDisposirion R) ( 26
C o l u m n s6 3 - 6 4 I n d e x L e n g t h ( O ) 13 C o l u r n n2 9 F i e l c l h a r n i n g O )
C ( 26
C o l u m n s6 8 - 6 9 T r a c k s / l n d e x O )
( 13 C o l u r n n3 O E x i t C o n t r o l ( O ) 27
C o l u m n s7 3 - 7 4 K e V L e n q t h ( O ) C o l u m n s3 3 ' 3 5 D a t a P o s i t i o n( R ) 2a
C o l u m n s7 8 - 8 0 K e y P o s i t i o n( O ) 13 C o l u r n n3 6 S p e c i a lK e y b o a r dC l o s e( O ) 28
Columns 3-100.
8 13 C , , l u n r n3 8 1 0 5
s 28
C o l u m n s8 3 - 8 4 I n d e x O r i g i n B u f f e r ( O ) I J ,END 2A
C o l u m n s8 8 - 9 0 I n d e x S t a r t P o s i t i o n{ O ) 1 a C o l u m n s 1 - 4 C o n t r o l S t a t e m e n tN a m e ( R ) 2A
C o l u m n s9 3 - 9 4 I n d e x E n d B u f f e r ( O ) 14 C o l u n r n 1 3 O o e r a t i n gM o d e ( O ) 28
C o l u m n s9 8 - 1 0 0 I n d e x E n d P o s i t i o n( O ) . 14 C o l u m n s 1 t 32 5 i n p u t / O u t p u r D a t a S e t N a m e ( O ) 28
, P RI N T E R 1 A
C o l u r n n2 6 D r i v e N u m b e r ( O ) 29
C o l u m n s 1 - 8 C o n t r o l S t a r e m e n tN a m e ( R ) C o l u m n s2 8 - 3 5 O u r p u t D a t a S e t o r P r o g r a mt r l a m e O )
( 29
C o l u m n 1 3 P r i n t e rT y p e ( R ) 14 C o l u m n 3 6 D r i v eN u m b e r 29
C o l u m n s 1 8 - 2 0 L i n e sP e r P a g e( O ) 14 Instructrons 29
C o l u m n s2 3 - 2 5 O v e r f l o w L i n e ( O ) t4 Arrthrlretic perations
O 29
C o l u m n s2 8 - 3 0 C h a r a c t e r P e r L - i n e R )
s ( tsranchinOperations
g JJ
C o l u m n s3 3 - 3 4 P r i m a r yB u f f e r ( R ) 15 D i s p l a ya n d K e y b o a r dO p e r a t i o n s. 40
C o l u m n s3 8 - 3 9 S e c o n d a r y u f f e r 1 O )
B 1 R Diskette perations,
O 41
C o l u m n s4 3 - 4 6 P r i n t e rO v e r fl o u r R o u t i n e ( O ) 15 P r i n t e rO p e r a l l o n s 46

iii
I n s t r u c t i o n s( c o n t i n u e d l CHAPTER 4. 3741 OPERATION 96
Table Operations 47 I n i t i a t i n g T r a n s l a t i o nw i t h t h e L a b e l P r o c e s s o r 96
lnternal Data MovementOperations 51 Base Pass 96
M i s c e l l a n e o u sn s t r u c t i o n s
l 58 Pass1 96
Communications. o l Pass2 . 96
B i n a r y S y n c h r o n o u sC o n r m u n i c a t i o n . 61 Pass3 . vb
E x p a n d e d C o m m u n i c a t i ( ) n sF e a t u r e 62 Label Processor nput Data Set I 96
U n a t t e n d e d A C L P r o g r a r nM o d e a f t e r C o m m u n i c a t i o n s 62 Label Processor utput O 98
Communication Mode lrom an ACL Program 62 Label Processor Error Messages 100
ACL Label Processor onfigurator C 101
CHAPTER 3. DESIGN ANT) IMPLEMENTATION
I n i t i a t i n g T r a n s l a t i o nw i t h o u t L a b e l P r o c e s s o r 102
CONSIDERATIONS 64 ProgramExecution 103
Considerationsor Efficient Key Entry Programs
f 64 Communications
'|03
S t o r a g eA l l o c a t i o n a n d R e q r " r e m e n t s
i 65 P r o g r a mD e b u g g i n g 104
T r a n s l a t o r S t o r a g eA s s i g rm e n r s 66 Step Trace 104
S t o r a g eR e q u i r e m e n t s bb R e g i s t e rT r a c e 104
Eff icient Useof Work Station Storage 68 Step Stop 104
Using Operator Messages 68 'l04
S i n g l eS t e p T r a c e
UsingTables . 68 Trace Output 104
Using the Key Indexed Access Method 70 S e l e c t i n gT r a c e 105
P r o v i d i n gO p e r a t o r E r r o r C o r r e c t i o n 70 Program Restart . 105
O p e r a t o r D o c u m e n t a t i o n ,T r a i n i n g . a n d T e s t i n g 73 C u s t o m e r D i a g n o s t i cD i s k e t t e 105
Operator Documentation 73 S t o r a g eD u m p s 106
OperatorTraining 75 Unformatted Display Dump 107
Application Debugging . 75 H e x a d e c i m a lD i s p l a y 107
Add itional Documentation 7q
Formatted Display Dump 108
Data Set Access Methods 75 Printer Dump 108
Sequential Access Metho,l 75 Disk Dump 109
Relative Record Number Access Method 77
Key Indexed Access Metlrod 79 APPENDIX A. INDICATORS 11O
Index or Label Access Mothod 81 Keyboard Indicators 1'11
Blocking and Deblockingof Logical Records 83 IndicatorsWithinaFunction-SelectedSecuence 113
Multiple Diskette Data Sets 85 I n d i c a t o r sS e t b y D a t a M o v e m e n t . 113
C u r r e n t F i l e D i s k A d d r e s s( C ; F D A ) 85
P r o g r a m m i n gH i n t s a7 APPENDIX TRANSLATOBERRORMESSAGES
B. . 114
Control Program 87 Error Formats
Translator 114
. F l E L D C o n t r o l S t a t e m en t 87 114
Messages StopTranslation
That Appear Line 1
on
Keyboard Indicator . 87 M e s s a g eT h a t D o N o t S t o p T r a n s l a t i o n A p p e a r o n L i n e 6
s 114
Programmng Restrictions
i 88 115
Control StatementMessages
Tables 88 116
G e n e r a lE r r o r M e s s a g e s
P r o g r a mO r i g i n B u f f e r 88 117
Warning Error Messages
Sequence of ACL Source Programs 88
Display Unit . 88 APPENDIX C. EXECUTION ERROR CODES, MEANING|S,
Printer Operations 89 118
AND OPERATOR RESPONSES
Arithmetic Operations 89
B r a n c h i n gO p e r a t i o n s 89 125
APPENDIX D. SAMPLE PROGRAMS
Disk Access Methods 89 SampleProgram1-OrderEntry 125
Internal Data Movemenl 89 130
S a m p l e P r o g r a m2 - M a i l i n g L i s t I n q u i r y
Restricted Areas . 89 R e g i s t e rU s a g e 132
Program Performance 90 Sample Program 3-Overlay Program 133
G e n e r a lC o n s i d e r a t i o n s. 90
Overlapped | /O-Printer 90 APPENDIX E. PRINTER LINK (RPOI FEATURE 137
Overlapped l/O-KeyboarrJ 91
SampleProgram. 139
Disk/Data Set Procedurer; 91
Program Load of Index I'able for Key Indexed Data Set 91
fNDEX 141
Record Access 92
Execution Timing 92
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IBM 3741 ProgrammableWork Station
Chapter1. Introduction

T h e I B M 3 7 4 1 M r t d e l s3 a n d 4 P r o g r a m m a b l e o r k S t a t i o n
W T h e 3 7 4 ' l M o d e l s3 a n d 4 P r o g r a m n i a b l e o r k S t a t i o n h a s
W
s u b s t a n t i a l l y n c r r : a s eh e d a t a e n t r y c a p a b i l i t i e s f t h e b a s i c
i t o a l l t h e s ef u n c t i o n si n a d c l i t i o n o t h e J u n c t i i ) n n o w a v a i l a b l e
t s
3 7 4 0 s y s t e m . S i g n i f i c a n ta d d i t i o n a l f u n c t i o n s b e y o n d t h e with the 3741 Models 1 and2 Data Station. The work sta-
s c o p eo f t h e I B M 3 7 4 1 M o d e l s 1 a n d 2 D a t a S t a t i o n a r e p r o - t i o n i s a l s oc o m p a t i b l ew i t h a l l o p t i o n a l f e a l u r e sc u r r e n t l y
v i d e d t h r o u g h a p r o g r a m m i n gf a c i l i t y c a l l e dA C L ( a p p l i c a t i o n a v a i l a b l e i t h t h e d a t a s t a t i o n .W h e n n o t o F r e r a t i n g n d e r
w u
c o n t r o l l a n g u a g e ) .T h e n o n c o m m u n i c a t i n g 7 4 1 M o d e l 3
3 A C L p r o g r a m c o n t r o l , t h e w o r k s t a t i o n f u n r : t i o n se x a c t l y
p r o v i d e sf u n c t i o n s b e y o n d t h o s e o l t h e c o r r e s p o n d i n g like the data station.
3 7 4 1 M o d e l 1 , w h i l e t h e c o m m u n i c a t i n g3 7 4 1 M o d e l 4 p r o -
v i d e s f u n c t i o n sb e y o n d t h o s e o f t h e c o r r e s p o n d i n g 7 4 1
3 A n o p t i o n a l A C L t r a n s l a t o rf e a t u r e ,w h i c h l r a n s l a t e s o d e d
c
M o d e l2 . A C L s o u r c ep r o g r a m si n t o m a c h i n e - r e a d a b lo b j e c t c o d e , i s
e
a v a i l a b l e T h e A C L t r a n s l a t o rf e a t u r e i s o n l l r r g q u i r s 6e .
.
T h e w o r k s t a t i o n p r o v i d e sp r o g r a m m a b l e u n c t i o n sw h i c h
f t h o s e w o r k s t a t i o n sb e i r r gu s e dt o g e n e r a t e b j e c t - l e v ep r o -
o l
c a n b e a d a p t e dt c n e w d a t a e n t r y a p p l i c a t i o n s o r b e u s e dt o
, g r a m s . T h e s eo b j e c t - l e v e p r o g r a m sc a n t h e n b e e x e c u t e do n
l
i m p r o v e p r o c e s s i r ro f e x i s t i n gi o b s .
g w o r k s t a t i o n sa t r e m o t e l o c a t i o n s( F i g u r e 1 ) . B o t h t h e
p r i n t e r a n d s e c o n dd i s k f e a t u r e s r e p r e r e q u i s i t e f o r t h e
a s
T h e w o r k s t a t i o n p r o v i d e st h e f o l l o w i n g n e w f u n c t i o n s : A C L t r a n s l a t o rf e a t u r e . W o r k s t a t i o n sw i t h t h e A C L t r a n s l a t o r
f e a t u r es h o u l d a l s o b e e q u i p p e dw i t h , t h eo p t i o n a l 3 7 4 1 r e c o r d
. Expanded arithmetic f unctions, including add, subtract, i n s e r tf e a t u r e f o r e a s ys o u r c ep r o g r a m m a i n t : e n a n c e .
m u l t i p l y , a n d r J i v i d e p e r a t i o n s w h i c h e n a b l ea d d i t i o n a l
o ,
f i e l d t o t a l s ,z e r o b a l a n c i n g a n d c r o s s f o o t i n g p e r a l o n s
, o
Creating a Source Program
. D a t a c h e c k i n go p e r a t i o n s ,i n c l u d i n gr a n g ec h e c k i n g ,l i m i t
c h e c k i n g ,a n d t a b l es e a r c h i n gw h i c h p r o v i d e i m p r o v e -
, A s o u r c ep r o g r a m c o n s i s t s f A C L c o r r t r o ls t a t e m e n t s n d
o a
rnents in data itccuracv i n s t r u c t i o n s .C o n t r o l s t a t e m e n t s e f i n e t h e p r o g r a m n a m e ,
d
d e f i n e a n d d e s c r i b e h e d a t a s e t sw i t h w h i c h t h e p r o g r a m
t
. Data manipulation which allows data entered from the works, definethe data setaccess ethod, provideprinter m
k e y b o a r d t o b r l r e f o r m a t t e da c c o r d i n gt o i n s t r u c t i o n s c o n t r o l i n f o r m a t i o n , a n d d e J i n et h e p r o m p t i n g m e s s a g e n d
a
b e f o r e b e i n g w r i t t e n o n t o a d i s k e t t e ,d i s p l a y e d ,o r s e l f - c h e c k l g o r i t h m . I n a d d i t i o n , t h e s es t a t e m e n t s p e c i f y
a s
p r in t e d d a t a m a n i p u l a t i o nf o r m a t s , c o n s t a n t i n f o r m a t i o n , a n d d e s i g -
nate the end of the program.
o Additional key'hoard and display functions which allow
m e s s a g ets b e d i s p l a y e d ,i n c l u d i n g p r o m p t s f o r d a t a
o T h e s e c o n dt y p e o f p r o g r a ms o u r c ei s i n s t r u c t i o n s . I n s t r u c -
ent!'V,promptr; for option selection,and prompted t i o n s s p e c i f y h o w o p e r a t i o n sa r e t o b e re x e c u t e d . I n s t r u c t i o n s
error correctton c a n i n i t i a t e l / O o p e r a t i o n s ,i n t e r n a ld a t a m c v e m e n t ,
b r a n c h i n gw i t h i n t h e p r o g r a m ,a n d a r i t h m e t i c o p e r a t i o n s .
o Additional disl:ette access methods which allow orocess- I n s t r u c t i o n sc a n e i t h e r b c p r e c e d e db y s t e p n u m b e r s ( 0 - 7 6 7 f o r
i n g o f m u l t i p l e d a t a s e t s ,r e a d i n ga n d w r i t i n g o n t w o a 4 K m a c h i n e ,o r 0 - 9 9 9 f o r a n 8 K n r a c h i n e ) r s y m b o l i c l a b e l s
o
d i s k e t t ed r i v e s ,a n d c r e a t i o na n d m a i n t e n a n c e f d a t a s e t
o i n t h e f i r s t c o l u m n o n t h e c o d i n g s h e e t . S y r n b o l i cl a b e l sc a n
i n d e x e st h a t p t o v i d e f a s t a c c e s so o n l i n e d a t a
t b e u p t o f o u r c h a r a c t e r so n g , b u t t h e f i r s t c h a r a c t e rm u s t b e
i
a l p h a b e t i c "T h e s u c c e e d i n g h a r a c t e r s a n t r e a l p h a b e t i c ,
c c
o Overlappedprrnting which allows the operator to key n u m e r i c ,o r s y m b o l c h a r a c t e r s .W h e n s y m b o l i c l a b e l sa r e
d a t a w h i l e d a t a w i t h i n t h e s y s t e mi s b e i n g p r i n t e d b y a n y u s e d ,t h e t i r s t p h a s eo f t r a n s l a t i o ni s l a b e l p r o c e s s i n gd u r i n g
,
o f t h e a v a i l a b k t r i n t e r sa t t a c h e d
p w h i c h l a b e l sa r e r e s o l v e d n d c o n v e r t e di n t c )s t e p n u m b e r s .
a

Introduction
I

A C L C o d i n gS h e e t s
Control Statements
Instructons
i

,3741 Central
Keyboard Location
(With Translator)

o
o

Source D iskette
I t_
I
I
I
I
I
I
I
t_
l-]

o
a

D iskette

Remote
Location
(No
Translator)

Standard
Execution
Function

Execute

F i g u r e 1 . S t r u r : t u r eo f t h e 3 7 4 1 M o d e l s 3 a n d 4
C o m m e n t sc a n l t e i n c l u d e di n t h e s o u r c ep r o g r a m t o c l a r i f y t r a n s l a t o rp h a s eo f o p e r a t i o n ,t h e i n s t r u c t i o n sy o u e n t e r a r e
i n s t r u c t i o n s . C o n t r o l s t a t e m e n t s a n b e e n t e r e do n A C L
c converted into object code, and a listing of error messages
Control Statements Coding Sheet One and Two, GX21 9200 is always printed out. (See lnitiating Translation With the
a n d G X 2 ' l - 9 2 0 1 . I n s t r u c t i o n sc a n b e e n t e r e do n A C L l n - Label Processorin Chapter 4.) Note that, if step numbers
structions Coding Sheet, GX21-9199. These sheets can be a r e u s e d i n a s o u r c ep r o g r a m ,t h e l a b e l p r o c e s s o p h a s eo f
:
o r d e r e d .b y o r d ' : r n u m b e r , i n p a d so f f i f t y f r o m y o u r I B M t r a n s l a t i o nm u s t b e b y p a s s e d .
m a r k e t i n gr e p r e s e n t a t i v e . o r a d e t a i l e dd i s c u s s r o n f c o d -
F o
i n g f o r c o n t r o l s t a t e m e n t s n d i n s t r u c t i o n s s e eC h a p t e r 2 .
a ,

Regi sters I ndicators
( 16 c h a r a c t e r s ) 1
3741 Models 3 trnd 4 Architecture
A

T h e s t a n d a r d3 7 ' 4 1M o d e l 3 o r 4 i s s r r u c t u r e ciln a 4 K - b y t e
( K e q u a l s1 0 2 4 ) b u f f e r / r e g i s t e r o n c e p t ( F i q u r e 2 ) . T h e f i r s t
c
1 0 2 4 b y t e s o f n r e m o r y a r e a l i o c a t e df o r s y s r e mc o n t r o l . T h i s
b l o c k o f m e m o r y a l s o c o n t a i n : ; h e 2 6 g e n e r a lp u r p o s er e g i s t e r s 255
t
( A - Z ) . T h e s e 1 ( i - c h a r a c t erre g i s t e r s r e u s e dt o p e r f o r m a l l W o r kS t a t i o r r
a
a r i t h m e t i co p e r a t i o n s , n d c a n a l s o b e s p e c i f e d t o m o v e d a t a
a i C o n t r o lP r o g r a n r m i r r g
i n t e r n a l l ya n d t o s t o r e d a t a . T h e i n d i c a t o r t a b l e c o n t a i n s2 5 5
i n d i c a t o r s ;i n d i c a t o r s1 t h r o u g h 9 9 c a n b e a s i g n e d b y t h e
programmer. 1024B u f f e r - 1 Display lines ,5, 6)
( 1
-2
-3
D i s p l a y( l i n e s2 , 3 , 4 )
P r in t e r
It',.u
T h e b a l a n c eo f l e a d / w r i t e s t o r a g ei s a l l o c a t e dt o i 2 8 - b y t e
-4 Printer
b u f f e r s ( F i g u r e 2 ) . T h e s eb u f f e r s a r e r e f e r e n c e d u m e r i c a l l y
n
-5 Data set (1)
( 1 - 2 4 l ,i n p r o g r a ms o u r c es t a t e m e n t s .A l t h o u g h b u f f e r 1 a n d
-o D a t as e t ( 2 )
b u f f e r 2 a r e a s s i g n e do t h e d i s p l a y ,t h e r e m a i n i n gb u f f e r s
t
-7 Tables
can be used to store operator prompting rrressages, keyboard
-8 T a bl e s
c o n t r o l i n f o r m a t i o n , t a b l e sa n d d a t a s e t i n d e x e s , n d o n l i n e
a
disk data sets arrd printer output. (SeeStorage Allocation Buffer -9 P r o m p t i n gm e s s a g e s
and Requiremelrts in Chapter 3.) - 10 P r o m p t i n gm e s s a g e s
-11 lnstructions
A n o p t i o n a l 8 K s t o r a g ef e a t u r e p r o v i d e sa n a d d i t i o n a l 3 2 -12 lnstructions Variable
g e n e r a lp u r p o s eb u f f e r s ( 1 2 8 b y t e s e a c h ) . T h r o u g h o u t t h i s - 13 Instruclrons (u n d e r
manual, any ref,:renceto buffers refers to buffers 1-24 for 14 |nstructions program
4 K o r 1 - 5 6f o r [ ] K . T h e 8 K f e a t u r ea l l o w su p t o g 9 9 -15 Instructions rner con-
e x e c u t a b l ei n s t r u c t i o n sw i t h a n i n s t r u c t i o n l e n g t h o f 4 b y t e s . 16 |nstructions trol)
A l l o t h e r a r e a so f w o r k s t a t i o n a r c h i t e c t u r e( F i g u r e 2 ) a r e
307 B u f f e r - 1 7
u n c h a n g e d y t l r e f e a t u r e ,e x c e p t t h a t c l a t af o r m a t s a r e
b -18 Disk indexes
l o a d e ds t a r t i n gi n b u f f e r 5 6 . -19 Diskindexes
-20 Diskindexes
A b a s i c4 K - b y t e p r o g r a mc a n b e t r a n s l a t e da n d e x e c u t e do n - z a 1I Diskindexes
a w o r k s t a t i o n v r i t h t h e 8 K f e a t u r e . H o w e v e r ,a n 8 K - b y t e -ZZ Data formats
p r o g r a m c a n n o t b e t r a n s l a t e d r e x e c u t e do n a 4 K w o r k
o -23 Data formats
station. -24 Data formats
4096 Read-write torage
S
After you have r:ompleted the coding sheets,and created
a s o u r c ep r o g r a r no n t h e d i s k e t t e v i a t h e 3 7 4 1 k e V b o a r d ,
t h e A C L t r a n s l a t o rf e a t u r ec r e a t e s b j e c t c o d e f r o m y o u r
o
'l-ranslation F i g u r e 2 . T y p i c a l A C L P r o g r a mS t r u c t u r e ( 4 K )
codedentries. o c c u r si n t w o d i s t i n c t p h a s e s f
o
o p e r a t i o n ;t h e l a b e l p r o c e s s o r h a s e , n d t h e t r a n s l a t o rp h a s e .
p a
D u r i n g t h e l a b e l p r o c e s s o r h a s e ,t h e s y m b o l i c l a b e l st h a t
p
p r e c e d ei n s t r u c t i o n sa r e c o n v e r t e di n t o s t e p n u m b e r sf o r
i n t e r n a l p r o c e s s i n g . h e s o u r c ef i l e l i s t i n go f t h e p r o g r a m c a n
T
a l s ob e p r i n t e d r l u r i n g t h e l a b e l p r o c e s s o r h a s e . D u r i n g t h e
p

Introductron
A C L P R O G R A M O P ER A ' ] i I O N The sequential or consecutive access method requiresthat the
r e c o r d s( o r 1 2 8 - p o s i t i o ns e c t o r s )b e p r o c e s s e d e q u e r r t i a l l y r
s o
A s i n d i c a t e dp r e v i o u s l y , h e w o r k s t a t i o n c o m b i n e st h e c a p a -
t consecutively, b a s e do n t h e p h y s i c a ld i s k a d c l r e s s G r v e no n e
.
b i l i t i e so t t h e 3 7 4 1 M o d e l : ,1 a n d 2 D a t a S t a t i o n w i t h n e w r e c o r d ,t h e l o c a t i o n o f t h e n e x t r e c o r d i s d e t ' e r m i n e d y t h e
b
c a p a b i l i t i e s r o v i d e d b y A r J L . T h e f o l l o w i n g o p e r a t i o n sa r e
p n e x t s e q u e n t i a d i s k a d d r e s sr n t h e d a t a s e t . T h i s m e r : h o d
l
a v a i l a b l e h r o u q h a p p r o p r i a t ei m p l e m e n t a t i o no f t h e a p p l i c a -
t a l l ow s :
tion control language.
o W r i t i n g r e c o r d si n t o a n e w d a t a s e t .

Branching o W r i t i n g o r a d d i n g r e c o r d sa t t h e e n d o f a n e x i s t i n , J a t a s e t .
d

U n c o n d i t i o n a la n d c o n d i t i o n a l b r a n c h i n gi n s t r u c t i o n sa l t e r o l l e a d i n gr e c o r d sf r o m a n e x i s t r n . r ;a t a s e 1 : .
d
t h e s e q u e n t i a e x e c u t i o no f t h e A C L p r o g r a m . A l l e x e c u t a b l e
l
i n s t r u c t i o n si n t h e p r o g r a n rc a n b e i d e n t i f i e dw i t h a s t e p o l l e a d i n ga n d u p d a t i n g r e c o r d si n a n e x i s t i n gd a t a s e t .
n u m b e r t 0 0 0 - 7 6 7 ) ,o r a f o u r - p o s i t i o ns y m b o l i c l a b e l p r e c e d i n g
t h e i n s t r u c t i o n O n l y t h o s e r n s t r u c t i o n s r a n c h e dt o m u s t h a v e o
i b l l e a d i n ga n d u p d a t i n g r e c o r d si n a n e x i s t i n gd a t a s e t , a n d
a p r e c e d i n g t e p n u m b e r o r l a b e l ;a l l o t h e r i n s t r u c t i o n s o
s d a d d i n g n e w r e c o r d sa t t h e e n d o f a