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Length: 7808 (0x1e80)
Types: RcTekst
Names: »31-D709.WP«
└─⟦b9fe312e5⟧ Bits:30008868 Diskette med 3 stk RCSL-30-M og 3 stk RCSL-31-D
└─⟦this⟧ »31-D709.WP«
╱0400274e0c0006000000000301483160000000000000000000000000000000000000000000000000050a0f14191e23282d32373c41464bff04╱ ┆06┆i↲ ↲ ╞ ╞ ┆a1┆┆b0┆FOREWORD↲ ↲ ╞ ╞ First edition: RCSL No. 31-D699.↲ ↲ ╞ ╞ Second edition: RCSL No. 31-D709.↲ ╞ ╞ ┆84┆This edition supersedes the first edition. The text has been ↓ ┆19┆┆89┆┄┄completely revised.↲ ↲ ↲ ╞ ╞ Pierce C. Hazelton↲ ╞ ╞ A/S Regnecentralen af 1979, May 1984.↲ ↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆06┆ii↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆06┆iii↲ ↲ ┆a1┆┆b0┆CONTENTS┆05┆PAGE↲ ↲ 1. INTRODUCTION ......................................................1↲ ↲ 2. PRODUCT HIGHLIGHTS ................................................2↲ ↲ 3. CONFIGURATIONS IN GENERAL .........................................5↲ ↲ 4. HARDWARE CONFIGURATIONS ...........................................6↲ ↲ 5. MEMORY REQUIREMENTS ...............................................7↲ ↲ ↲ APPENDIX:↲ ↲ A. REFERENCES ........................................................8↲ ↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆06┆iv↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆14┆┆b3┆┆06┆┆0b┆↲ ↲ ┆a1┆┆b0┆1.╞ ╞ INTRODUCTION↲ ↲ ╞ ╞ ┆84┆This manual gives an introductory description of the connection ↓ ┆19┆┆89┆┄┄of RC855 IBM 3270 BSC Datex terminal systems to the RC8000 com-↓ ┆19┆┆89┆┄┄puter through an RC8303 front-end computer. Communication is ↓ ┆19┆┆89┆┄┄established through the X.21 public data network service.↲ ↲ ╞ ╞ ┆84┆Programmers who are to write FORMAT 8000 applications should ↓ ┆19┆┆89┆┄┄have some knowledge of the NCP (ref. 1) and the FORMAT 8000 ↓ ┆19┆┆89┆┄┄concept (refs. 2 and 3). Also, the description of the ↓ ┆19┆┆89┆┄┄FORMAT 8000 system as it runs on the RC3500 computer will help ↓ ┆19┆┆89┆┄┄to elucidate matters (ref. 4).↲ ↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆a1┆┆b0┆2.╞ ╞ PRODUCT HIGHLIGHTS↲ ↲ ╞ ╞ o ┆a1┆RC855 Support┆e1┆↲ ↲ ╞ ╞ ┆84┆The RC8000 SW8720 software package "RC855 DATEX IBM 3270 ↓ ┆19┆┆8c┆┄┄BSC" is designed especially to support RC855 IBM 3270 BSC ↓ ┆19┆┆8c┆┄┄Datex terminal systems.↲ ↲ ╞ ╞ o ┆a1┆Multiple DCE Environments↲ ↲ ╞ ╞ ┆84┆RC855 Datex terminals may be switched to connect to as many ↓ ┆19┆┆8c┆┄┄as four RC8303 front-end computers without user reconfigu-↓ ┆19┆┆8c┆┄┄ration.↲ ↲ ╞ ╞ o ┆a1┆Multiple Host Environments↲ ↲ ╞ ╞ ┆84┆The RC8303 front-end computer may be FPA connected to as ↓ ┆19┆┆8c┆┄┄many as eight host computers.↲ ↲ ╞ ╞ o ┆a1┆Datex Select Operation↲ ↲ ╞ ╞ ┆84┆The Datex numbers used to establish the connection between ↓ ┆19┆┆8c┆┄┄the Datex terminals and the front-end computer may be rede-↓ ┆19┆┆8c┆┄┄fined (or extended) by any application linked to the front-↓ ┆19┆┆8c┆┄┄end.↲ ↲ ╞ ╞ o ┆a1┆Format-Oriented Printer Support↲ ↲ ╞ ╞ ┆84┆Printers are addressable devices, operating independently of ↓ ┆19┆┆8c┆┄┄the attached display. Any printer may be temporarily con┄↓ ┆19┆┆8c┆┄┄nect┄ed to any host.↲ ↲ ════════════════════════════════════════════════════════════════════════ ↓ ╞ ╞ o ┆a1┆┆e1┆ ┆a1┆Menu Select Operations↲ ↲ ╞ ╞ ┆84┆Each application in the host computer has an associated link ↓ ┆19┆┆8c┆┄┄number. The link number and a descriptive text constitute a ↓ ┆19┆┆8c┆┄┄menu section from which the terminal selects a link. If a ↓ ┆19┆┆8c┆┄┄link is reselected, the logical device number remains the ↓ ┆19┆┆8c┆┄┄same. The menu section is common to all terminals, and may ↓ ┆19┆┆8c┆┄┄be redefined by any application linked to the front-end com-↓ ┆19┆┆8c┆┄┄puter. The menu sections from one or more front-ends consti-↓ ┆19┆┆8c┆┄┄tute the menu as displayed on the Datex terminals.↲ ↲ ╞ ╞ o ┆a1┆FORMAT 8000 Support↲ ↲ ╞ ╞ ┆84┆The RC8000 SW8720 software package fully supports the FORMAT ↓ ┆19┆┆8c┆┄┄8000 data transaction system.↲ ↲ ╞ ╞ o ┆a1┆Dynamic Addressing Technique↲ ↲ ╞ ╞ ┆84┆New devices may be connected without software modification. ↓ ┆19┆┆8c┆┄┄Devices are uniquely identified either by their physical or ↓ ┆19┆┆8c┆┄┄by their logical device number. Normally the application ↓ ┆19┆┆8c┆┄┄program uses the logical device number, but it may use the ↓ ┆19┆┆8c┆┄┄physical device number for unique identification as well.↲ ↲ ╞ ╞ o ┆a1┆Automated Application Switch↲ ↲ ╞ ╞ ┆84┆Devices may be switched by the application program itself to ↓ ┆19┆┆8c┆┄┄connect to a new application linked to the front-end com┄↓ ┆19┆┆8c┆┄┄puter. A message may be transferred from the old application ↓ ┆19┆┆8c┆┄┄to the new application when the switch is made.↲ ↲ ╞ ╞ o ┆a1┆User-Written Menu Applications↲ ↲ ╞ ╞ ┆84┆The combination of menu select operations and automated ↓ ┆19┆┆8c┆┄┄application switch provides the user with tools for con-↓ ┆19┆┆8c┆┄┄structing a user-written menu application. Such an appli┄↓ ┆19┆┆8c┆┄┄cation will typically supervise the access of the individual ↓ ┆19┆┆8c┆┄┄terminal to the links associated with the front-end comput-↓ ┆19┆┆8c┆┄┄er.↲ ↲ ════════════════════════════════════════════════════════════════════════ ↓ ╞ ╞ o ┆a1┆Multiplexing, Spooling, and Printing Facilities↲ ↲ ╞ ╞ ┆84┆The MIPS/TS software package (SW8100) offers facilities for ↓ ┆19┆┆8c┆┄┄terminal multiplexing and spooling. Also, the printing of ↓ ┆19┆┆8c┆┄┄ISO text files on the attached format-oriented printers is ↓ ┆19┆┆8c┆┄┄supported.↲ ↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆a1┆┆b0┆3.╞ ╞ CONFIGURATIONS IN GENERAL↲ ↲ ╞ ╞ ┆84┆There are numerous configuration possibilities when connecting ↓ ┆19┆┆89┆┄┄one or more RC855 IBM 3270 BSC Datex terminal systems to the ↓ ┆19┆┆89┆┄┄RC8000 computer through an RC8303 front-end computer.↲ ↲ ╞ ╞ ┆84┆In the RC855 terminal system, the control unit, or CU, supports ↓ ┆19┆┆89┆┄┄a cluster of as many as sixteen devices, namely, eight display ↓ ┆19┆┆89┆┄┄devices and one printer device physically attached to each ↓ ┆19┆┆89┆┄┄display.↲ ↲ ╞ ╞ ┆84┆The relevant maximum hardware configuration, Datex numbers, and ↓ ┆19┆┆89┆┄┄connections to the RC8303 must be defined precisely in the ↓ ┆19┆┆89┆┄┄RC8303 software modules. To the RC8000, however, the configura┄↓ ┆19┆┆89┆┄┄tion is a series of devices, each represented by a unique ↓ ┆19┆┆89┆┄┄address. Displays are regarded as input and output devices, ↓ ┆19┆┆89┆┄┄printers normally as output devices only.↲ ↲ ╞ ╞ ┆84┆The addressing of the individual devices may be done conveni┄↓ ┆19┆┆89┆┄┄ently by means of the FORMAT 8000 data transaction system. This ↓ ┆19┆┆89┆┄┄system, in turn, is capable of generating the header and ↓ ┆19┆┆89┆┄┄trailer information.↲ ↲ ╞ ╞ ┆84┆The following are ┆a1┆maximum┆e1┆ configuration parameter values for ↓ ┆19┆┆89┆┄┄the RC8303 system:↲ ↲ ╞ ╞ active applications (links to one or more hosts):┆05┆8↲ ╞ ╞ devices per link:┆05┆512↲ ╞ ╞ lines (DCEs):┆05┆8↲ ╞ ╞ line speed (bps):┆05┆9600↲ ╞ ╞ clusters:┆05┆32↲ ╞ ╞ devices per cluster:┆05┆16↲ ╞ ╞ clusters per line (DCE):┆05┆32↲ ↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆a1┆┆b0┆4.╞ ╞ HARDWARE CONFIGURATIONS↲ ↲ ╞ ╞ ┆84┆The figure below shows one of many possible hardware configu-↓ ┆19┆┆89┆┄┄rations. Here, a combined CU/display station supports two other ↓ ┆19┆┆89┆┄┄display stations and two printers in a cluster.↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ↲ ╞ ╞ ┆84┆The maximum number of links to one or more RC8000 computers is ↓ ┆19┆┆89┆┄┄eight. The maximum number of DCEs in the RC8303 system is also ↓ ┆19┆┆89┆┄┄eight. ┆a1┆Note┆e1┆, however, that the number of DCEs depends, not on ↓ ┆19┆┆89┆┄┄the number of links, but on the amount of traffic on the net-↓ ┆19┆┆89┆┄┄work.↲ ↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆a1┆┆b0┆5.╞ ╞ MEMORY REQUIREMENTS↲ ↲ ╞ ╞ ┆84┆The memory requirement in the RC8303 front-end computer is ↓ ┆19┆┆89┆┄┄highly dependent on the number of lines (DCEs) to the control ↓ ┆19┆┆89┆┄┄units and the number of links to one or more host computers.↲ ↲ ╞ ╞ ┆84┆For example, a system with four DCEs, four links, and space re-↓ ┆19┆┆89┆┄┄served for supporting thirty-two clusters would occupy a total ↓ ┆19┆┆89┆┄┄of 99088 bytes (N: 51646, X: 47442).↲ ↲ ╞ ╞ _________________________↲ ╞ ╞ ┆a1┆╞ Core LINK LINE ↲ ╞ ╞ ┆a1┆ N 1110 3900 ↲ ╞ ╞ ┆a1┆ X 1024 1024 ↲ ╞ ╞ ┆a1┆ Total 2134 4924 ↲ ↲ ↲ ╞ ╞ ┆84┆The table above gives the number of bytes to be used for each ↓ ┆19┆┆89┆┄┄link and for each line (DCE). The figures are intended as a ↓ ┆19┆┆89┆┄┄guide, in accordance with release 2.0 of the RC8000 SW8720/1 ↓ ┆19┆┆89┆┄┄software package.↲ ↲ ════════════════════════════════════════════════════════════════════════ ↓ ┆a1┆┆b0┆A.╞ ╞ REFERENCES↲ ↲ ╞ ╞ (1) RCSL No 43-RI260:↲ ╞ ╞ ╞ RC-NET↲ ╞ ╞ ╞ User Defined Driver Programs in RC3600 Device Controller↲ ╞ ╞ ╞ Reference Manual↲ ╞ ╞ ╞ Ole Krag Hansen↲ ↲ ╞ ╞ (2)╞ RCSL No 42-i1278:↲ ╞ ╞ ╞ ALGOL8, Part 2↲ ╞ ╞ ╞ User's Guide↲ ╞ ╞ ╞ Edith Rosenberg↲ ↲ ╞ ╞ (3)╞ RCSL No 52-AA640:↲ ╞ ╞ ╞ FORMAT 8000↲ ╞ ╞ ╞ A Transaction Oriented System↲ ╞ ╞ ╞ Bo Bagger Laursen↲ ↲ ╞ ╞ (4)╞ RCSL No 52-AA494:↲ ╞ ╞ ╞ FORMAT 8000↲ ╞ ╞ ╞ Display System↲ ╞ ╞ ╞ Bo Bagger Laursen↲ ↲ ╞ ╞ (5)╞ RCSL No 31-D693:↲ ╞ ╞ ╞ IBM 3270 Terminal Handler↲ ╞ ╞ ╞ User's Guide↲ ╞ ╞ ╞ Bent Johansen↲ ↲ ╞ ╞ (6)╞ RCSL No 31-D694:↲ ╞ ╞ ╞ IBM 3270 Terminal Handler↲ ╞ ╞ ╞ System Messages↲ ╞ ╞ ╞ Bent Johansen↲ ↲ ┆1a┆┆1a┆↓ ┆1a┆↓ ┆1a┆↓ ┆1a┆┆1a┆↓ ↲ ↓ ┆1a┆↓ ┆1a┆routine pointers for all 8259 in