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Fifth Edition (December
1976)
T h i s i s a m a j o r r e v i s i o no f , a n d r e p l a c e s G C 2 1 - 7 5 7 3 - 3a n d T e c h n i c a l N e w s l e t t e r s
,
G N 2 1 - 7 7 7 5 , G N 2 1 - 5 2 7 9 , a n d G N 2 1 - 5 3 6 3 . C h a n g e s r e i n d i c a t e db y a v e r t i c a l l i n e
a
at the left of the clrange. New or extensively revised illustrations are indicated by the
symbol o to the le"t of the caption.
T h i s e d i t i o n a p p l i e st o P r o g r a m N u m b e r 5 7 0 2 - S C 1 ( v e r s i o n1 0 a n d m o d i f i c a t i o n 0 0 )
o f I B M S y s t e m / 3 l / l o d e l 1 0 D i s k S y s t e m , P r o g r a m N u m b e r 5 7 0 4 - S C ' l ( v e r s i o n0 1 a n d
modification O0) c'f IBM System/3 Model 15, Program Number 57O4-SC2 {version
01 and modification O0) of IBM System/3 Model 15, and ProgramNumber 5705-
S C l ( v e r s i o nO 2 a r r d m o d i f i c a t i o n 0 0 1 o f I B M S y s t e m / 3 M o d e l 1 2 , a n d t o a l l s u b s e -
quent versions and modifications until otherwise indicated in new editions or techni'
cal newsletters.
Changesto the inf ormation herein are made periodically. Before using this publica-
tion to operate an IBM system, refer to the latest IBM System/3 Bibliognphy,
GC20-8080, for tl'e editions that are applicable and current.
Requests for copir:s of IBM publications should be made to your IBM representative
o r t o t h e I B M b r a r r 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 .
A Readers Comm(lnts form is provided at the back of this publication. lf the form has
been removed, cornments may be addressedto tBM Corporation, Publications, Depan-
m e n t 2 4 5 , R o c h e s t e r ,M i n n e s o t a5 5 9 0 1 .
O 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 2 , 1 9 7 3 , 1 9 7 4 , 19 7 6
M
Preface
This manualprovides programming the informationrequired SYSTEM/3MODEL 8
t o u s et h e M u l t i l i n e / M u l t i p o i n te a t u r e M L M p )w i t h
F (
System/3 Model 10, Model 12, or Model l5 binarysynchro, The System/3Model8 is supported Systern/3 by Model 10
n o u sc o m m u n i c a t i o n s o g r a m s .
pr Disk System control programming program and products.
The facilities described this publication the Model 10
in for
On the Model 'l0 and Model 12. M LMp is a featureof the arealsoapplicable the Model8, although
to the Modelg is
System Control Programming (5702-SCl,Features 6030 not referenced. However. the Integrated Conrmunications
a n d 6 0 3 1 ) . O n t h e M o d e l1 5 , M L M P i s i n c l u d e dn t h e b a s e
i A d a p t e r( l C A ) i s o n l y a v a i l a b l o n t h e M o d e lg . l f y o u
e
System ControlProgramming (5704-SC1 5704-SC2l.
or haveeither the ICA or local displayadapter, is always it
designated BSCA line 2. Therefore,
as you must specify
Hereafter, terms"MLMP" and ,,System/3,,
the shouldbe line 2 whenever ICA or localdisplayadapteris used.
the or
understood applyingto the System/3
as Model 10 Disk Sys- enterthe BSCAOCL statement BSCA LItVE-2) (// at
t e m ,t h e M o d e l1 2 ,a n d t h e M o d e l1 5 .u n l e s s u a l i f i e d y
q b executiontime. lt shouldbe noted that not all devices
" M o d e l 1 0 a n d M o d e l12 o n l y " o r , , M o d e 1 5 o n l y . , ,
l
a n df e a t u r e w h i c ha r ea v a i l a b lo n t h e M o d e l1 0 a r ea v a i l -
s e
ableon the Model8. Therefore, Model8 users shouldbe
This reference manualis intended applications
for program- famifiar with the contentsof IBM System/3lvlodetg
m e r sw h o a r ef a m i l i a r i t h :
w lntroduction, GC21-5114.
o Basictelecommunications and practices
concepts
Prerequisite
Publications
. IBM System/3BasicAssembler
language
. Generallnformation: Binary Synchronous Communica-
o I B M S y s t e m / 3 o d e l1 0 D i s kS y s t e mM o d e l1 2 ,o r
M , tions, GA27-3OO4
M o d e l1 5
. IBM System/3 Models 8, 10, 12, and l5 Cc,mponenrc
The manualdescribes MLMP and the functionsof MLMp. ReferenceManual, G42 1-9236
the System/3 MLMP macroinstructions, the MLMp diag-
and
nostics and diagnostic
aids. The book alsolistsMLMp sys-
tem requirements considerations.
and Appendixes containa
list of MLMP considerations uniqueto certainterminals,
ex-
amples codedMLMP macroinstructions a sample
of and pro-
gram,dataareaformats,BSCline control characters and
codes, and a macroinstructionsummary.
As noted in the text, many of the crossreferences this
in
manual address indexentries.
Preface i
RelatedPublications I BM System Binary Synchronous Communications
/7
Module (RPG), ProgrammingGuide and Reference
. IBM System/3 BasicAssenbler ReferenceManual Manual.SC34-1 510
sc21-7509
Multiplexor "Tf'MM"
I 8M System Teleprocessing
/7
. IBM System/3Models4,6,8, 10,and l2 SystemGenera- ProgrammingGuide and ReferenceManual Su,cporting
tion ReferenceManual,GC21 Sl 26 or tBM System/3 RPO D0801/. SC34-1506
Model l5 System Generation ReferenceManual.
GC21 616
7 SystemComponents: IBM 2770 Data Communication
System,
GA27-3013
. IBM System/3 Model 8 Operator's Guide, GC21-7634,
IBM System/3 Model l0 DiskSystem Operator,sGuide, l8M 2780 Data TransrnissionTerminal: Comtrtonent
GC21-7508or IBM System/3Modet l5 Operator's Descr t ion, GA27-3005
ip
Guide.GC215075
Component Dercription: l8M 2972 Models 8 and | |
. IBM System/3 Model lA DiskSystem Control program- GeneralBanking Terminal System, GL27-3020
ming Reference Manual,GC21-7512; tBM System/3
Model l5 System Control ProgrammingReference l8M 3270 lnfarmation Display System Compctnent
Manual (5704 SCl l, GC21-5O77or tBM System/3Modet
, Devription, GA27-2749
l5 SystemControl ProgrammingConceptsand Reference
M a n u a l , 5 7 0 4 - S C 2G,C 2 1 5 1 2
( ) - 6 l8M 3735 Programmer'sGuide, GC30-3001
IBM System/3Model l0 DiskSystemHalt Guide. o l8M Systems3735 Support Program Coding lV,tanual,
GC21-7540or IBM System/3MocletlS System GC21.5096
Messages,
GC21-5076
IBM System/3 Disk System Control programming Macros
ReferenceManual, GC2"l-1562or IBM System/3 Model
l' IBM 3600 Finance Communication SystemProgram-
mer's Guide and Component Description, GC27-OOO4
15 System Control ProgrammingMacrosprogramming
Reference Manual,GC21 7608
l8M SystemR Overlay Linkage Editor Reference
Manual,GC217561
l8M SystentRMultiple Line Terntinal
Adapter RPQ
Program Referenceand Component Descriptiotl
Manual.GC21-7560
IBM SystemR Model l2 SysremControl Programming
Reference -51
Manual.GC21 30
IBM SystemR Model l2 Operator'sGuide, GC21-5144
IBM SystemR Model 12 User"s
Guide. GC21-5142
IBM SystemR Models8, 10, 12,and 15 Components
ReferenceManual.GA2 1-9236
o IBM SystemRModel 12 Hatt Guide,GC21-S14b
o IBM SystemQ Systerns
Summary,GA34 0002
Page { GC21-75734
o
l s s u e d 1 5 o v e m b e r1 9 7 7
1 N
By TNL.: GN21-5587
Contents
C H A P T E R1 . M U L T I L I N E / M U L T I P O I N T I N A R Y
B C H A P T E R5 . R E O T J I R E M E N TA N D
S
S Y N C HR O N O U S C O M M U N I C A T IO N S I CONSIDERATIOf.JS 57
T e l e c o m m u n i c a t i o nL i n e sS u p p o r t e d
s 5 S y s t e mC o n f r g u r s t i o n 51
Functions M o d e l8 51
M u l t i p l e L i n e T e r m i n a lA d a p t e r 6 Model1O . 57
l \ 4 o d e l1 2 . 58
M o d e l1 5 . 58
CHAPTER2. SYSTEM/3MACRO INSTRUCTIONS
Storage equirements
R 59
D e s c r i pito n 7 Programming equirements
R 59
Conventions 8 MLMP Programming onsiderations C 59
CHAPTER3. MLMP PROGRAMMTNG 9 A P P E N D I XA , D E V I C E . D E P E N D E N T
P r e p a r i n go r D a t a T r a n s f e r
f I CONSIDERATIONS 61
Generate ommon Equates $COMN)
C ( 10 I B M 2 9 7 2 B a n k i n gT e r m i n a lS y s t e m tll
G e n e r a t e S C D T F D i s p l a c e m e n ta n d L a b e l s
8 s l 8 l \ , 1 2 7 0 I n f o r m a t i o n D i s p l a yS y s t e m
3 o l
{$DTOB) 10 P o l l i n g / A d d r e s s i n g3 2 7 0
a b l
D e t i n et h e F i t ef o r B S C ( $ D T F B ) . 10 R e a d i n gF r o r n a n d W r i t i n g T o a R e m o t e 3 2 1 O
B
A l l o c a t e S CF r l e s $ A L O C )
( 16 H o w t o R e q i r e s a n O n l i n eT e s t f r o r n a 3 2 7 0
t 11
O p e n8 S C F i l e s( $ O P E N ) 18 S t a t u si S e n s ef v l e s s a g e s
Gnerate Model10 and Model 12 Checklist
a P o l l i n g / A d d r e s s i n g3 2 7 0 v i a t h e D i s p l a yA d a p r e r
a l6
-17
( $ C KL ) 17 I B M 3 7 3 5 P r o g r a m m a b lT e r m i n a l
e
'77
G e n e r a t e M o d e l ' l5 C h e c k l i s r $ C K L )
a 1 18 F o r m D e s c r i p t o r o n v e r tR o u t i n e ( $ $ B S C N )
C
G e n e r a t e P o l l r n g / A d d r e s s i n gs t { $ P O L B )
a Li 19 A d d i t i o n a l3 7 3 5 C o n s r d e r a o n s
rt 78
C h a n g e P o l i i n g i s t( S B C P L )
a L 20
Generate ParameteListf or Changing Polling
a r a A P P E N D I XB . S A M P L E S . 79
L i s to r a S w i t c h e d D L i s t ( $ C H G B )
l 21 S a m p l eM L M P M a c r o I n s t r u c t i o n s 79
A l l o c a t et h e T e r r n i n a l t a t i s t i c s o g g i n gA r e a
S L M o d e l 1 0 a n d M o d e l 1 2 S a m p l eP r o g r a m :
($LOGBi 21 Communicating ith the 3270
w 8l
G e n e r a t e S w i t c h e dl D L i s r ( $ S W I B )
a 22
C h a n g e S w r t c h e dl D L i s t ( $ B C S W )
a 23 A P P E N D I XC . D A T A A R E A S , P A R A M E T E RL I S T S .
G e n e r a t e T r a n s l a t e a r a m e t e L i s t ( $ T RL )
a P r AND MESSAGEFORMATS . IUJ
Generate Translate able($TRTB)
a T B S CD T F 105
Generate n Interfaceo the Translate outine
a t R MLMP l/O Area 109
($TRAN) 25 T e r m i n a lS t a t i s t i c s o g g i n gA r e a
L 109
G e n e r a t e n O n l r n eT e s t P a r a m e t e L i s t ( $ R F T L )
a r T r a c eT a b l e 110
I n r t i a t i n g a t aT r a n s f e r
D 27 BSCl/O Regislers 111
Move Mode 21 Checklrst 111
l s s u e G E T R e q u e s( $ G E T B )
a t Pollrng/Addressingst Lr 112
l s s u e P U T R e q u e s t( $ P U T B )
a 28 S w r t c h e dl D L r s t 112
C a n c e a G E T R e q u e s t( $ C A N B )
l 29 P a r a m e t e L i s t f o r C h a n g i n g P o l l i n gL i s t o r
r a
C h e c kf o r l / O C o m p l e t i o n( $ C H K ) 29 S w r t c h e dl D L r s t 112
T e c h n i q u e s o r I n i t i a t i n gD a t a T r a n s f e r
f J I
P
Translate arameteLrst r 113
T e r m i n a t i n gD a t a T r a n s l e r JV
O n l r n eT e s l P a r a m e t e L i s t
r 113
T e r m i n a t eB S C F i l e s 39 O n l r n eT e s t R e q u e s t s 114
C l r : s e S C F i l e s( $ C L O S )
B M LMP Message ormats F 115
39
A P P E N D I XD . C O N T R O L C H A R A C T E R SA N D
C H A P T E R 4 . D I A G N O S T I C SA N D D I A G N O S T I C CODES 117
AIDS 41 EBCDC I 117
Mnotes 4 l A S C II 118
H al t s 45 H e x a d e c i m aR e p re s e n t a t i o n s
l 119
Completron odes C 45 T r i b u t a r y S y s t e m / 3P o l l i n ga n d A d d r e s s i n g
B S CC o u n t e r s 50 C h ar a ct er s 119
I n i t i a l i z i n gL T E R F I L
M 50
O n l i n eT e s t 5 l A P P E N D I X E , M A C R O I N S T R U C T I O NS U M M A R Y 121
Trace 54
S n a p D u m p M a i n S t o r a g e( $ S N A P ) 55 INDEX 123
Contents iii
Chapter Multiline/MultipointinarySynchronous
1. B Communications
(t
M u l t i l i n e / M u l t i p o i n M L M P )i s a b i n a r ys y n c h r o n o u s M L M Pe n a b l ets e a s s e m b l e r o g r a m m e o t r a n s m i a n d
h pr tr t
communications (BSC)featureof System/3.MLMp pro- r e c e i v e i n a r ys y n c h r o n o u s t ao v e r t w ot e l e c o m m u n i r : a .
b da
vides the assembler programmer access the BSCl/O
to t i o n sl i n e s i m u l t a n e o u s( e a c hi n er e q u i r e a B S C A ) .
s ly l s
routines that supportthe BinarySynchronous Communica- The two linescan be usedin the same program can be or
tions Adapter(BSCA)asan l/O device. For a description usedindependently separate in programlevels Modr:l10 (on
of the BSCA,seethe appropriate components reference o r M o d e l1 2 t h a t h a st h e d u a l p r o g r a m m i nfg a r u r e n -
e r
manualfor your systemlisted in the Preface. I s t a t t e O lr i n t h e p r o g r a m a r t i t i o n so n M o d e l1 5 ) . T l - r e
o p (
linescan be nonswitched switched.Figr.rre gives
or 1 e>cam-
p l e so f t h e l i n ec o n f i g u r a t i o n s s s i b l w i t l r M L M P .
po e
N o n s w r t c h e dM u l t i p o i n t
System/3 r B M3 2 7 1
M o d e l1 0 , Control
1 2 ,o r 1 5 Unit
Nonswitched,
Point-to-Point
\
\
System/3
Model6 Data Set Data Set
(RPGII (Modem) (Modem)
Only)
System/3 B Switched Point.to-Point
M o d e l1 0 . S
1 2 ,o r 1 5 c Data Set Data Set
A (Modem) (Modem System/370
BSCA
Nonswitched, Point-to-Pr nt
)r
\
L-
B EI
System/3
Data Set S S
\ l Common
\ l Carrier
(Modeml c M2 ,o e 1 5 , c;
o d l1 0
1 r
A
DataSet DataSet
System/370
(Modem Modeml
Data Set
(Modem)
Figure I (Part 1 of 21. Examples of MLMp BSC Networks
M u l t i l i n e / M u l t i p o i n t B i n a r y S y n c h r o n o u sC o r n m u n i c a t i o n s 1
8000 BPSLocal Interface
System/3
M o d e l8 2400 BPSLocal Interface
'The Integrated
C o m m u n i c a r i o n sA d a p t e r ( l C A ) m u s t b e a d d r e s s e d s B S C A
a
l i n e 2 . T h e m a n u a l I C A s w i t c h c a n h a v e o n l y o n e i n t e r f a c ea c t i v e a t a n y
one time.
2 S e eF i g u r e ( P a r t
1 1 o f 2 ) f o r e x a m p l e so f B S C A l i n e c o n f i g u r a t i o n s .
Figure 1 (Part 2 of 21. Examples of MLMP BSC Networks
The MLMP userspecifies functionsof MLMP l/O rou-
the Figure2 showsthe relationof MLMP to the macroproc-
tinesby usingSystem/3 assembler macroinstructions (see essor, overlaylinkage
the editor.and userprograms.
Chapter 2). The IBM System/3 MacrosFeature expands
t h e s e a c r oi n s t r u c t i o nis t o l i n k a g eo M L M P r o u t i n e s .
m n t F i g u r e s h o w s h e r e l a t i o n s h io f a u s e rM L M P p r o g r a mo
3 t p t
M L M P l / O r o u t i n e sB S CD T F s ,B S Cl O l l sa n d b u f f e r s .
.
Linkage the MLMP routinesis assembled part of the
to as and the BSCA.
user'sprogram.The IBM System/3OverlayLinkageEditor
is then usedto incorporate MLMP routinesin the
the
user'sobjectprogram.
U s e rM L M P
Source The userassembler
Ihe programincludes
Program macroinstructions MLMP l/O routines.
for
Macro Macroinstructions expanded
are into
Processor l i n k a g eo M L M Pr o u t i n e s .
t
The userprogram. which now includes
Assembler l i n k a g eo t h e M L M P r o u t i n e si,s
t
assembled.
MLMP
Routines
Overlay
M LMP routines incorporated
L are into
Linkage
objectprogram.
the user's
e
Editor
U s e rM L M P
Object
Program
Terminals B B Terminals
S S
Execution
c c
A A
Figure 2. Generation of a User MLMp Object program
M u l t i l i n e / M u l t i p o i n t B i n a r y S y n c h r o n o u sC o m m u n i c a t i o n s 3
G =
#-- '
l .9^
L >
: =r t \ i
-
L O l c o g
o q )
l = e-t-*. v
(l)
o - c ^
< ' - L -
z : i . .
J ^ : U
> = d g
3
F
E 3
E 9 o
o ; *
- c -
tl - o
C D o
I
E
L O
X
I L F
i l t l
x
3
o- .E
=3p A
. 9 0
6 6
--.()
: 3
f
L X
H 5
s o
G o
o
- o - R
Figure3. Functional Control and Data Ftow of MLMp b '0 a =F > i
6
l J c o = E
nications
Telecommu LinesSirpported ISM 2972/2980Banking TerminalSysterm (supported
in the United States
only) asdescribed Component
irt
F o l l o w i n g r et h e t e r m i n a l a n d l i n ec o n n e c t i o ns u p p o r t e d
a s s Desription: l8M 2972 ModelsS and ll GeneralBank'
b y M L M P . F o r c o n s i d e r a t i o n s i q u et o u s i n g g i v e n e r -
un a t ing Terminal Systems,GL27-3020
m i n a lw i t h M L M P ,s e eA p p e n d i x . A
I B M 3 2 7 0 I n f o r m a t i o n i s p l a y y s t e m sd e s c r i b eid
D S a n
IBM 3270 lnformation Display SystemClomponent
Nonswitched Poi n t-to.Poin t Dercription, GA27-2749
MLMP supports point-topoint nonswitchedconnections o I B M 3 7 3 5 P r o g r a m m a bTe r m i n aa sd e s c r i b eid I B M
le l n
with centralprocessingunits programmedaccording the
to 3735 Programmer'sGuide, GC3G3001
conventionsdescribed Generallnformation: Binary
in
Synchronous Communications, GA27-3004. MLMP also o I B M 3 6 0 0 F i n a n c e o m m u n i c a t i oS y s t e m M o d e l' l5
C n (
supportspoint-to-point nonswitchedconnections
with the: only) as described IBM 3600 FinancerCommunica-
in
tion System Programmer'sGuide and Co,mponentDes-
cription, GC27-0004
o I B M S y s t e m / 7 e l e p r o c e s s iMg l t i p l e x o ( T P M M )a s
T nu r
describedin IBM System/7 Teleprocessing Multiplexor
"TPMM" ProgrammingGuide and ReferenceManual
WhenSystem/3is a control station.MLMF,
SupportingRPO D0801/, SC34-1506
d o e s o t s u p p o r ti n t e r m i x i n g f t e r m i n a l , c no n e l i n e .
n o s
o f BM 277ADa1a Communication
System described
as in
Note: For informationon how to generate IBM 3735 form
System Components: IBM 2770 Data Communication
descriptor programs (FDPs)on System/3, IBM System/3
see
S y s t e mG 4 2 7 - 3 0 1 3
,
Model !0 Disk System 3735 Application Pitckage Coding
. Manual.GC21-5096.A conversion routine (FDP/Convert)
IBM 2780 DataTransmission Terminalasdescribed
in
is p r o v i d e d i t h M L M Pt o c o n v e r t D P s e n e r a t eo n O S
w F g d
IBM 2780 Data TransmissionTerminal: Component
or DOSto a format suitable transmission
for from Model
Desc p ti on, G427-3005
ri
I 0 or Model 12 ro a 3735. For a description F DP/Convert, of
seeindex entry FDP/Convert.
Multipoint
Switched Poin t-to-Point
MLMP supports System/3 a control stationand as
as
MLMP supports point-to-point
switchedconnections
with
a multidropped
tbrminal. As a control station,
t h ef o l l o w i n g :
System/3can exchangebinarysynchronous datawith:
o Centralprocessing
units programmedaccording the
to
. IBMSystem/3
conventionsdescribed Generallnforntation: Binary
in
. Synchronous Communicationt G427-3004
IBM System/7as described IBM System/7Binary
in
Synchron ous Comm un ications M odule Programmi ng
Guideand Reference Manual,SC34-1510 o I B M S y s t e m / 7 e l e p r o c e s s iMg l t i p l e x o r T P M M )a s
T nu (
describedin IBM System/7 Teleprocessi,ng Multiplexor
r I B M S y s t e m / 7 e l e p r o c e s s iMg l t i p l e x o ( T P M M )a s
T nu r "TPMM" ProgrammingGuide and ReferenceManual
describedin l8M System/7 Teleprocesing Multiplexor SupportingBPO D0801 /, SC34-1506
"TPMM" ProgrammingGuide and ReferenceManual
SupportingRPO D0801/. SC34-1506
o IBM 277ODataCommunication System described
as in
o f BM 277ODataCommunication
Systemasdescribed in System Componen$: IBM 2770 Data C'ommunication
SystemComponen*: IBM 2770 Data Communication System,GA27-3013
System, GA27-3013
o IBM 2780 DataTransmission Terminalasdescribedin
o IBM 2780 DataTransmission Terminalas described
in IBM 2780 Data TransmissionTerminal: Component
l8M 2780 Data TransmissionTerminal: Component Dercription, GA27-3005
Dercription, GA27-3005
M u l t i l i n e / M u l t i p o i n t B i n a r y S y n c h r o n o u sC o m m u n i c a t i o n s 5
o IBM 3275 DisplayStationasdescribed IBM 3270
in Depending the terminalusedand whetheror tlot datais
on
I nformation Display SystemComponent Description, exchanged conversational
in mode,records transtnitted
GA27.2749 and received be fixed length,
can variable length,or span-
ned (onerecordcan occupyspace two contiguous in blocks).
o f BM 3735 Programmable Terminals describedin
as tBM D a t ac a n b e e x c h a n g eid E B C D I C E x t e n d e d i r a r y C o d e d
(
n B
3 735 Programmer's Gu i de. GC30-300.| D e c i m aIl n t e r c h a n g eo d e )o r i n A S C I I ( A m e r i c a n a t i o n -
C N
a l S t a n d a r d o d ef o r I n f o r m a t i o n n t e r c h a n g e )l,e p e n d i n g
C I c
o f BM System/7as described tBM System/7 Systems
in on the BSCAused. Datatranslation supported trans- is by
Summary, GA34-0002 latetables generated with macroinstructions.EllCDlC
t r a n s p a r e n c y d I T B ( l n t e r m e d i a tB l o c kC h e c k i n ga r e
an e )
F o r s w i t c h e d o n n e c t i o n s , L M Ps u p p o r t s u t o c a l( U n i t e d
c M a l supported MLMP. by
S t a t e s n l y ) ,m a n u ac a l l ,a u t o a n s w em a n u a a n s w e ra n d
o l r, l ,
the exchange stationidentification
of characters.
M L M Pd o e sn o t t r a n s m i t e a d i n g r a p h i c sM L M p c a n r e -
l .
ceiveleading graphics, doesnot pass
but them to rne user.
Note: For informationon how to generate IBM 3735 form
descriptorprograms (FDPs)on System/3,seelgM System/3
D u r i n gp r o g r a m x e c u t i o nM L M Pa u t o m a t i c a l ld o e s h e
e . y t
Model l0 Disk System 3735 Support program Reference
following:
Manual,GC21-5096.A conversion routine (FDp/Convert)
is providedwith MLMP to convertFDpsgenerated OS on . Blocksand deblocks
dataas required.
or DOSto a format suitable transmission
for from Model
10 to a 3735. For a description FDP/Convert, index
of see . Moves userdatafrom the user'slogicalbuffer to the
entry FDP/Convert.
telecommunications bufferswhensending
l/O data
(PUT requests).
Functions
o Moves userdatafrom the telecommunications buf- l/O
fersto the user's logicalbuffer when receiving
data
The followingprogramfunctionsare available the MLMP
to
( G E Tr e q u e s t s ) .
user:
a Inserts
and removes
data-linkcontrol characters
as
t. only (receive
Receive input datafrom a remote
terminal). necessary.
MLMP provides error recovery, errorrecording arrd.at
2. Receivewith transmittal conversational
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