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Manual
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GC21-5113-2
File No. 53-08
Preface
T h i sm a n u a il s i n t e n r l e d r i m a r i l y o r d a t ap r o c e s s i n g r -
p f pe familiar with System/3and 3741 operations. (Seethe
s o n n ew h o a r ep l a n n i n gn s t a l l a t i o n a n I B M 3 7 4 1D a t a
l i of IBM Data StationOperator's Guide,GA21-9131.)Refer
Stationor 3741 Prol;rammable Work Stationdirectly a s r e q u i r e d o o n e o f t h e f o l l o w i n qr e f e r e n c m a n u a l s :
t e
a t t a c h e do a S y s t e n r , M o d e l6 . 8 , 1 0 , 1 2 ,o r 1 5 ,a n d f o r
t /3
key stationoperators who usea 3741 directlyattached a to . IBM 3741 Data Station Reference
Manual. GA21-9183.
S y s t e m / 3 o d e t6 , i ,1 0 , 1 2 ,o r 1 5 .
M
. IBM 3741 Models 3 and 4 ProgrammableW T h e p u r p o s e f t h i s n r a n u ails t o d e s c r i b t h e o p e r a t i o n n d
o e a Programming ReferenceManual, GA21-919,+.
useof a 3741 that s directly attached a System/3. to
(The3741 hasan inlcut/output adapter and the System/3 SeeAppendixA for a bibliography relatedpublications.
of
h a sa 3 7 4 1 a t t a c h m e nfte a t u r e . T h e r e a d e r h o u l db e
) s
Third Edition (September
1978)
T h i s p u b l i c a t i o ni s a m a j o r r e v i s i o n f , a n d o b s o l e t e sG C 2 1 - 5 1 1 3 - 1 n d t e c h n i c a ln e w s -
o , a
l e t t e r sG N 2 1 - 5 4 1 9a n d G N 2 1 - 5 5 5 6 .C h a n g e so t e x r a n d i l l u s t r a t i o n s r e i n d i c a t e db y
t a
a v e r t i c a l l i n e t o t h e l e f t :o f t h e c h a n g eo r a d d i t i o n .
T h i s e d i t i o n a p p l i e st o t h e f o l l o w i n g I B M S y s t e m / 3 s y s t e m c o n t r o l p r o g r a m sa n d t o a l l
s u b s e q u e n tv e r s i o n sa n d m o d i f i c a t i o n s u n t i l o t h e r w i s e i n d i c a t e d i n n e w e d i t i o n s o r
t e c h ni c a l n e w s l e t t e r s .
Version Modif ication P r o g r a mN u m b e r System/3 Model
15 o0 5702-SC
1 Model 10 Disk and Model8
t3 00 5703-SCl Model 6
Ub 00 5704-SC1 Model 15A-B-C
03 00 5704-SC2 Model 15D
o4 00 5705-SC1 Model 12
C h a n g e s r e p e r i o d i c a l l l /m a d e t o t h e i n f o r m a t i o n h e r e i n ; b e f o r e u s i n gt h i s p u b l i c a t i o n
a
i n c o n n e c t i o n w i t h t h e o p e r a t i o n o f I B M s y s t e m s ,r e f e r t o t h e l a t e s t I B M S y s t e m / 3
B i b l i o g r a p h y . G C 2 0 - 8 0 8 0 , f o r t h e e d i t i o n s t h a t a r e a p p l i c a b l ea n d c u r r e n t .
T h i s p u b l i c a t i o n c o n t a i r re x a m p l e so f d a t a a n d r e p o r t s u s e d i n d a i l y b u s i n e s s p e r a t i o n s .
o
T o i l l u s t r a t et h e m a s c o n l p l e t e l y a s p o s s i b l e ,t h e e x a m p l e si n c l u d e t h e n a m e so f i n d i v i d -
uals, companies,brands, and products. All of these names are fictitious and any
s i m i l a r i t y t o t h e n a m e sa n d a d d r e s s e s s e d b y a n a c t u a l b u s i n e s s n t e r p r i s ei s e n t i r e l y
u e
c o i n c i d e n tal .
U s e t h i s p u b l i c a t i o n o n \ / f o r t h e p u r p o s e ss t a t e d i n t h e P r e f a c e .
P u b l i c a t i o n sa r e n o t s t o c k e d a t t h e a d d r e s sb e l o w . R e q u e s t sf o r c o p i e s o f I B M p u b l i -
c a t i o n sa n d f o r t e c h n i c a l i n f o r m a t i o n a b o u t t h e s y s t e m s h o u l d b e m a d e t o y o u r I B M
r e p r e s e n t a t i v e r t o t h e t r r a n c ho f f i c e s e r v i n gy o u r l o c a l i t y .
o
T h i s p u b l i c a t i o n c o u l d r : r r n t a i nt e c h n i c a l i n a c c u r a c i e s r t y p o g r a p h i c a le r r o r s . A d d r e s s
o
your comments about tl'lispublication to IBM Corporation. Publications,Department
2 4 5 , R o c h e s t e r ,M i n n e s o t a 5 5 9 0 1 . I B M m a y u s e a n d d i s t r i b u t e a n y o f t h e i n f o r m a t i o n
y o u s u p p l y i n a n y w a y i t b e l i e v e s p p r o p r i a t ew i t h o u t i n c u r r i n g a n y o b l i g a t i o n w h a t e v e r .
a
Y o u m a y , o f c o u r s e ,c o n t i n u e t o u s e t h e i n f o r m a t i o n y o u s u p p l y .
@ C o p y r i g h t I n t e r n a t i o n a l B u s i n e s s a c h i n e sC o r p o r a t i o n 1 9 7 5 , 1 9 7 6 , 1 9 7 7 , r c 7 1
M
Contents
LIST OF AABREVIATTONS
v Conrnuatron
HOW TO USE THIS MANUAL Conditions 37
. .i,
v 5rror
considerations 37
.HAPTER 1. lNTRoDUcrtoN eading- Mode 2, Muttipre 37
o"tu s"tr; oo"rurol.
D e s c r i p t i o no f t h e M o d e l s
and RecordingMedia
S v s t ot-e m Q -e q ^ -i^r-e^ e n t s
SYs R ..i-u - m ' I Function
use of the 3741 onrine and otrti.o 1 . -r-e p a r a t i o n
p _ 3g
. . . .
? ? . 3 8
P r o g r a m m i n gr a c i t i i i e s . 4 Error Conditions 38
.
performancJ.o"r,Ouru,,o" 4 Consrclerations 3g
s
Qy c ^-o
R- :
S r rs tre m ^ - e.q u i r e m e n t s 5
5 Rea i i n - - i ^ .
R e a dd nn g^ r ^ M o d e ^
3, Multiple Data Sets
38
JO
S Function 39
cHAprER2.3T4lopERAroN . . ::
Featu res 6 ilii,i,,ijill . . .
A s u m m a r y o f s t a n d|a|r d a n d u d r | q U p t | o n a | F e a t U r e s . 7 E r r o r C o n d i t i o n s
9 ( q u d ' optionar' r"u,rru,
. : 9::rlir"t':. 39
Second Disk Feature
8 Considerations 40
3741 Offline Opurution,
11 , . q
8 E 4 40
Entering Data E x a m p t e s.
' 40
Updating Records 8 R e a d i n g- M o d e 4 , M u l t i p l e o a t a
S e t s ;u r " ; n r . i g n " o
. C E^di^^ c^-..-
Adding Records
42
searchinsrorDataontheD,skette
. . . . : . : 5.Ue11."11,; . . . . . 42
3T4t Dispray Screen
. . :
9 ::"-oj:"]l?" t i o n
Termina 42
Linel-statusLine
I Continuation 42
Lanes2through6
1l Error Conditions 42
Data Set Label
Data Recovery . .
3T4t Operator Duties
PlanninsDiskettecont"ntr"nop.os,"'ns"qr"n"". . . . . . . 1:
lnitiatins an operation - . . l: """r'rl1;T.o".u,Yr,:r:o"*i",,
. .-- . :: :i::.-l 46
S i t e P l a n n i n g.
14 Termination 46
AA
c H A P T E R 3 . P R o G R A M M | N G F A c | L | T | E s 1 5 : i l . J : " . i l T " " , . . . . . ' . .
SystemControl Program j: trror conditions
. .- _ lb 46
Functions Considerations
17 47
Programs ExamPles.
47
P r o g r a mP r o d u c t s 24 W r i t i n g - M o d e s 1, 2 , a n d5
49
RpG ' 29 Function
preparation 49
S u b s e tA N s c o ' o L 29
49
F.RTRAN lv 29 Termination
49
B a s i cA s s e m b l e r 30 Contrnuatton
Disk Sort and CCP/DiskSort
. 50
Tape sort 31 Considerations
D i s k R e s i d e n t c a r d U t i.r r t i e.s
. -'iH#.;"itr,r-.o",us".r.
. . . . .
C o n v e r s a t i o n a lU t i l i t i e s ii
31
- . : . . - ;i
1255 Utitity Preoaration
5t
DATA/3
31 Continuation '
system/3 BASIg
3l Error Conditions
52
CHAPTER 4. MOOES OF considerations
OpERATtoN E x a m p r e s. 53
f n i t i a fo p e r a t i n g l n s t r u c t i o n s f o r M o d e s 32
1,2,3,4,and5 53
34 Writing-Mode4,MultipleDatasets;u.er-assignea'
CheckingData Set Labels
Locating the First Record to
be processed . . 34 Function 55
S e l e c t i n gt h e M o d e ;: ; _ bb
-
Readinsrrr"a" s"ni" out.s"i .
i,
Function
: . . .
3;6
; ; :o n,t:i.n ^ :a " i1 ' n .
c ^: : u . t o 5s
preparation
. . .
Termination 56
36 consrderations
E x a m p r e s. 56
56
Contents ill
CHAPTER 5. ERROR CONDIT]ONS APPENDIX A. BIBLIOGRAPHY
60 78
System/3 Halts
60
3741 Errors 60 APPENDIX B. LAYOUT OF DISKETTE 80
Error Descriptions 65 The IBM Diskette 80
Index Track (Track 0Ol Label . 80
CHAPTER 6. EXAMPLES 67
summary of the Exarnrples. 67 APPENOIX C. VALID 3741 CHARACTERS 84
Example 1 68
Example 2 68 APPENOIX D. 3741 STATUS LINE . 85
Example 3 69
Example 4 70 INOEX 86
Example 5 70
Example6 71
Example 7 72
Example8 73
Example 9 74
E x a m p l e1 0 75
E x a m p l e1 1 76
E x a m p l e1 2 77
tv
List of Abbreviations
ACL Applicati
BoE ,.n,"","n"ir1LTl]ransuase
Binarysynchronouscommunicationsadapter
::91
BSCC Binarysvnchronous.ornrnrni".iionscontroller
CCP Communicationscontrol ;;;;;;;
CPU processing it
un
?lI Disptay format facitity
DPF Dual program feature
EOD End of data
EOE End of extent
EOJ End of job
l/O Input/output
l9A Integrated communications adapter
IPL I n i t i a lp r o g r a m o a d
t
LCA Localcommunications adapter
MFCM Multi_function card machine
MFCU M u l t i - f u n c t i o c a r du n i t
n
MRJE M U L T T - L E A V I N Ge m o t e o b
r j entry
MVI M u l t i v o l u m en d i c a t o r
i
OCC Operatorcontrol command
OCL Operation control language
PP programproduct
RDRO R e a d eq u e u e
r
RJE Remotejob entry
SCP Systemcontrol programming
VTOC Volumetableof contents
How To UseThisManual
T h i s p u b l i c a t i o ns d e s i g n etd b e u s e di n a n y o n eo f s e v e r a l a y s ,d e p e n d i n u p o n y o u r
i o w g
needs:
As an Overview
Chapterl. lntroduction.' Provides overview the onlinefunctionsand characteristics
an of
o f t h e 3 7 4 1 d i r e c t l ya t t a c h e do a s y s t e m / 3M o d e l6 , 8 , 1 0 , 1 2 ,o r 1 5 .
t
Chapter 3741 Operation: Explains operationof the 3741 both asan onlinedevice
2. the
directlyattached a System/3
to and as an offline device.
As a Reference
Summary
Chapter3. Programming Facilities: Describes System/3systemcontrol programming and
p r o g r a m r o d u c t sn r e l a t i o n o t h e 3 7 4 1 . l t p r o v i d e a r e f e r e n cs u m m a r y f t h e f a c i l i t i e s
p i t s e o
p r o v i d e d y p a r t i c u l ap r o g r a m s ,u c ha s R P Gl l .
b r s
As an Operator's
Guide
Chapter Modesof Operation.'Contains
4. informationrelevant the individualmodes.
to
This chapteris dividedinto separate
sections eachreadand write mode. This allows
for
you tc, remove particular
a sectionand keepit at the 3741 for quick reference perform-
in
ing da'y-to-day vities.
acti
Chapter Error Conditions: Explains possible
5. the error conditionsand recovery
actions.
You nrayfind it convenient remove
to this chapterand placeit nearthe 3741.
As a Planning uide
G
Provides
Chapter Examples.'
6. that canserve aidsin planning
examples as your programs.
Apperrdixesincluded :
are
Appendix A. Bibliography
Appendix B. Layout of Diskette
Appen,dix C. Valid 3741 Characters
Appen,dixD. 3741 StatusLine
Chapter 1l Introduction
.
The four models the 3741 are the 3741
of DataStation T h e I B M 3 7 4 1 P r o g r a m m a bW o r k S t a t i o nM o d e l3 p e r -
le
Models1 and2 and the 3741 programmable
Work Station f o r m st h e M o d e l1 f u n c t i o n s n d ,i n a d d i t i o n c a no p e r a r e
a
M o d e l s a n d4 ( F i g u r e ) . M o d e l s a n
3 ,
l c be useo: undercontrol of application programs written in ACL
( a p p l i c a t i oc o n t r o ll a n g u a g e )M o d e l4 p e r f o r m s
n .
. As online l/O (input/output)devices the
direcily attached Model2 f unctions and can useACL.
to System/3.
o As offline dataentry devices. Only one 3741 canbe directlyattached a System/3. to
W h e nt h i s 3 7 4 1i s o p e r a t i n g n l i n et o S y s t e r m / 3 , l y
o on
o A s t e r m i n ad e v i c e i n a c o m m u n i c a t i o n s Model 1 functionsare supported.
l s environment
( M o d e2 o r 4 o n l y ) .
l
The 3741 uses magnetic
a recording
mediurncalledthe
IBM DisketteFigure ).
( 2
T h i s m a n u ad e s c r i b e s e o n l i n ef u n c t i o n s
l th a n dc h a r a c t e r i s _
tics of the 3741 directlyattached a System/3 to Model6, f f your System/3hasa directly attached3741 vou can
System/3Modelg, System/3Model ,
10,System/3Model alsousecard l/O devices (except the Modelg which
for
12, or System/3Model 15. When
the 3741is directly doesnot havecard l/O). The arrangement records a
attached a System/3, 3741 requires
to of on
the an l/O adapter disketteparallels arrangement punchred
and the System/3requires 3741 the of card records.
a attachment feature. Also,operations parallel
thoseof a card-oriented
system.
Note: ln this manual,online means that the 3741 is being f n this manual,
input to System/3is calleda readoperation
usedasan l/O devicedirectlyattached a System/3;
to off_ from the diskette;output from System/3is calleda write
line meansthat the 3741 is beingusedindepenctently the
of operation the diskette(ratherthan punchto cards).
to
System/3.Also,a directlyattached 3741 Model2 or 4 can
performoffline operations with another3741 Model2 or 4. In the publications the 3740 system..the
for termread.or
input, relers reading
to from the l/O channel the 3741
on
Any reference the 374.l usedasa terminaldevice
to is (a System/3 write operation),and the term write, or out-
clearlyspecified; otherwiseany reference this manual
in to put, refers writing to the l/O channelon the 3741 (a
to
the 3741 is a reference a 3741 usedasan online
to l/O System/3readoperation ).
devicedirectlyattached a System/3.
to
Also,any reference Model l0 alwaysmeans
to System/3 S Y S T E MR E O U I R E M E N T S
Model 10 DiskSystem.
F o r i n f o r m a t i o n o n c e r n i ntg e m i n i m u ms ! / s t e m o n fi g -
c h c
urationrequired usethe directlyattached
to 3741 and
DESCRIPTION F THE MODELS ND RECORDING
O A additional devices supported the system
by controtprogram,
MEDIA
s e e n e o f t h e f o l l o w i n g u b l i c a t i o n s ,sa p p r o p r i a tfe r
o p a o
your IBM System/3 odel: m
For a description the functionsperformed the
of by individ_
uaf modelsof the 3741, refer to the IBM 3741 Data Station . l8M System/3 Models 4, 6, B, | 0, and | 2 Sysrem
Reference Manual,Glr21-glg3 or to the IBM 3Z4l Models
Generation ReferenceManual, GC21-512{i
3 and 4 ProgrammabletWork Station programming Refer_
ence Manual, GA21-g 194. . IBM System/3 Model l5 System Generation Reference
Manual,GC21-7616
The f BM 3741 DataStationModel 1 is a single operator,
key entry stationwithrone or two diskettedrives. Model . IBM System/3Model 8 lntroduction, GC2l1_5114
2 performs the Model 1 functionsand hasa BSCA (binary
synchronous communications adapter) that it canfunc-
so . IBM System/3Model l2 lntroduction, GC21_S116
tion asa remoteterminalin a telecommunications
environment. . IBM System/3Model ls lntroduction, GCt2l-S094
fntroduction 1
Keyboardand Switches
DisplayScreen Disk
ette Drive 2
\
I DisketteDrive 1
Figure 1. IBM 3741 Data Station or Programmabl Work Station
Figure 2. Inserting an IBM Disktto
U S EO F T H E 3 7 4 1O N L I N E
AND OFFLTNE communications adapters,data record:; transferred
are
Communications betweenthe 3741and System/3
Configurations bu ,,,;;;;;ommunica-
t i o n sp r o g r a m m i n g .
F o r l o c a lu s ea sa t e r m i n a l( F i g u r e p a r t
3, B ) , t h e 3 7 4 1i s Whenthe 3741 is directly
attached System/3via LCA (local
to attached liystem/3via the
to
communi".tion, 3 7 4 1a t t a c h m e nfte a t u r e F i g u r e p . , : r ,
a d a p t e ro r I C A ( i n t e g r a t e d
) ( S,
c o m m u n i c a t i o n s a p t e r ) .F o r
ad n it can
remoteuseasa terminal,the for systeminput and output
3741 i, ,ttu"h"Jto System/3 l._::"0 aswell " r i for data
as
),
v i aa B S C Ao r l C A . W h e n output. (Nocommunications ogramming pr
t h e 3 7 4 1 i s u r i n gu n y o f t h e s e is
H;:r"O
O n l i n et o Off line f ronr
' -- ll '..i r '"
System/3r , System/3r ! _ ! , - , ; .
t E -
F 'o .
L r.,- a---1, l I t' "**i''-l
l-"'----4
, - 1 l l
i l r
, .
)t'
3741 Data Station Modet 3741 DataStation Modet2
2
or or
3741 Programmable ol<
W 374 1 Programmable\Mork
Station Model 4 StationModel4.
Local
Remote
Onlineto Attachment
,Attachment
Systemr'3 , :.'.
3741(directiy
3741 DataStation 3741 DataStation
attached) M o d e l2 M o d e t2
or or
3 7 4 1P r o g r a m m a b l e
3 7 4 1P r o g r a m m a b l e
Work Station
Work Station
M o d e l4
M o d e l4
Notes:
1. The directly attached
3741 canoperate eitheronline
with System/3 with other
or 3741s*ii,.'orr,,n. ,o
System/3; cannotdo both
it
, at the sametime.
2. BSCAcan be usedwith
any Sv"rrnli.#i.
ICA can be usedwith IBM ,|r.
Svrt../S MoiJiu
3. LCA can be usedwith IBM ",
Svr,.rnli Vf.J.l 6, 10, or 15.
ICA can be usedwith tBM
Srr*rnl3 It/.dii g or 12.
4 . B S C C a nb e u s e d i t h
c w I B M S y s t e m / 3 o d e l1 5 D .
M
Figure 3" Communications
configurations
I ntroduction 3
3741 Operations Model:
SYstem/3
Function 6 8 10 12 15ABC 15D
T h e d i r e c t l y t t a c h e d 7 4 1 s h o u l db e p o w e r e d n p r i o rt o
a 3 o
g
p e r f o r m i n a n i n i t i a lp r o , g r a m a d ( l P L ) o n t h e S y s t e m / 3
lo S y s t e mn p u t o r
i X X X X X X
and powered after the System/3 poweredoff. lf it
off is output device
becomes necessary po,wer 3741 on or off while a pro-
to the
g r a mi s r u n n i n g n t h e S y s t e m / 3p r e s s T O Po n t h e p r o -
i , S i
S p o o l i n gn p u t X X
cessing unit, powerthe :1741 or off, then press
on START $ee Spoolingl
on the processing it. un
D a t a m a n a g e m e nX
t X X X X X
l f t h e 3 7 4 1 h a sb e e no n l i n et o t h e S y s t e m / 3t,h e k e y e n t r y
p r o g r a m m u s tb e r e l o a d e df t h e 3 7 4 1 i s t o b e u s e d sa k e y
s i a Device-independent X X
e n t r yd e v i c e . d a t am a n a g e m e n t
i f
T h e 3 7 4 1 k e y b o a r ds e n a b l e do r o f f l i n eo p e r a t i o ns o t h a t
s D i s kS o r t i n p u t X X
you can enteror change dataon diskettes.
RPGllinputor X X X X X X
To transfer ptacethe 3741
datato or from the System/3, outpur
online in a reador write mode. (SeeChapter4. Modesof
Operation.)The five readand write modesoffer a means of COBOL X
transferring data rapidlybetween the 3741 and System/3.
FORTRAN X
B a c k u p i l e sa n df i l e st h a t a r e u s e d n l y o c c a s i o n a lcy nb e
f o la
storedcompactlyon diskettes.
F i g u r e 4 . 3 7 4 1 P r o g r a m m i n gF u n c t i o n s
A l l m o d e l s f t h e 3 7 4 1 c a no p e r a t e f f l i n e . M o d e l s a n d
o o 3
4 c a n u s eA C L o n l y w h e r n f f l i n e . W h e no n l i n et o S y s t e m /
o
3, the 3741 Model2, 3, or 4 operates sameas a Model 1. the The systeminput device, calledthe systemreader, or
C h a p t e2 i n c l u d e a b r i e fd e s c r i p t i oo f o f f l i n eo p e r a t i o n s ;
r s n s i m p l yR E A D E R ,r e a d s u c ht h i n g s sO C L ( o p e r a t i o n o n -
s a c
for more completeinformation, either the tBM 3747
see trol languageland for
utility control statements the system'
DataStationReference Manual,GA21 g183,or rheIBM The system output device, calledthe systempunch.or
3741 Models3 and 4 Pr,ogrammable Work StationProgram- simply PUNCH,writes or punchesoutput such as object
ming Reference Manual,. GA21-9194. programs.
Datamanagement deviceindependent
and data management
p R O G R A M M I N G A C IL I T I E S
F r o u t i n e s r ei n c l u d e dn u s e r
i
a p r o g r a m s ,u c ha s R P Gl l o b -
s
ject programs. readdatafrom the 3741 or write datato
to
S y s t e m / 3 r o g r a m m i nfg r t h e d i r e c t l ya t t a c h e d 7 4 1 i s
p o 3 t h e 3 7 4 1 . R e c o r d s r o c e s s eb y d a t am a n a g e m e n t ef i x e d
p d ar
s i m i l a r o t h a t f o r a c a r dr e a d e o r c a r dp u n c h . F i g u r e
t r 4 l e n g t h n d u n b l o c k e d .A f i l e c o n s i s t s
a o f o n e o r m o r ed a t a
l i s t ss o m eo f t h e p r o g r a r n m i n g n c t i o n s h a t a r ea v a i l a b l e .
fu t s e t s n o n e o r m o r ed i s k e t t e s .
o
A s p e c i f i c e c o r d e n g t h f 9 6 i s r e q u i r e d h e nt h e 3 7 4 1
r l o w
i s u s e da st h e s y s t e m n p u t o r o u t p u t d e v i c ef;o r a l l o t h e r
i W h e nt h e 3 7 4 1 i s o n l i n e ,S y s t e m / 3 a n r e a df r o m o r w r i t e
c
f u n c t i o n s . t h e r e c o r d l e r r g t h c a n b e f r o m l t h r o u g h l 2 8 . t o t h e 3 T 4 l , b u t c a n n o t d o b o t h a t t h e s a m e t i m e .l y
On
one file on 3741 diskettes be usedat one time' For
can
example, althoughSystem/3 can assign 3741 to be
the
b o t h t h e R E A D E Ra n d t h e P U N C H , h e 3 7 4 1 c a n n o tb e
t
usedas both simultaneouslV. operatorcan,however,
The
stop the processing change and modes(reador write), then
contlnue processing. Also,an RPG I I programcan have
only one file description specification that defines diskette
a
f ile.
An SCP(svstem utility program
control programming)
copiesrecords and from the 3741'
to
P E RF O R M A N C E C O N S I D E R A T I O N S
SYSTEM EOUIREMENTS
R
SyStem/3 Canreed aoDroximately 1EOOrecords per minute To usethe 3741 dlrectly attached Sy:;tem/3,
from the 374j andcan write approximately to you need
1000 records ( a sa m i n i m u m )t h e d i r e c t l ya t t a c h e d 7 4 1a n d t h e
per minute to the 3741 when: 3 follow-
ing.
o R e c o r d sa r e t r a n s f e r r e db e t w e e nt h e
3 7 4 . 1a n d a d i s k T h e M o d e l6 r e q u i r e a 1 2 K p r o c e s s i n gr n i t , 5 4 4 4 D i s k
s
d e v i c e( 5 4 4 4 , 5 4 4 5 , 3 3 4 0 o r 3 3 4 4 ) . r- a
Storage Drive,and a printer. Note that the systemcannot
haveboth a 3741 attachment featureanrd seriall/O
a
o 128-byte records are used on the diskette
and double c h a n n e l .P r o g r a m m i nrg q u i r e m e n as et h e S y s t e m o n t r o l
e tr
b u f f e r i n g i s s p e c i f i e di n t h e S y s t e m / 3 p r o g r a m