IBM 3174 Introduction

Programming Dependencies
The IPDS depends on programming support outside the 3174 controllers.
The
IPDS is dependent on VTAM/NCP to support printer operations to a
BSC-attached controller.
It does not depend on the presence of a write control
character
(WCC) to indicate "start print" in the data stream.
Error Reporting and Recovery
The IPDS exception conditions are detected by the attached printer and are
reported (at the data stream
level) to the application program that generated the
IPDS data. The exception conditions are reported in an IPDS structured field called
Acknowledge (ACK) Reply.
The
controller has no knowledge of printer-detected IPDS exceptions and does not
take part in recovery except as directed by the
application program.
Multiple Logical Terminals (ML T)
Multiple Logical Terminal (ML T) support is a feature of Configuration Support-A
(Release 3 and higher), Configuration
Support-S (Release 2 and higher), and
Configuration Support-B microcode.
It enables IBM 3270 CUT displays that are
attached to any model IBM 3174, regardless of host connection protocol, to interact
with up to five host sessions, depending upon the configuration support
level. The
host sessions can be
directly connected to a single IBM host and one or more
ASCII hosts. Each session can be connected to only one host at a time.
Country Extended Code Page (CECP)
The Country Extended Code Page (CECP) feature is an extension of each
Latin-based national language code page, to a 191-code-point language code page
for the countries listed below. When used in conjunction with CECP-capable
displays and printers,
CECP allows you to use symbols from languages other than
the one
for which the 3174 controller is customized. The Country Extended Code
Page feature is supported by each release of Configuration Support-A (Release 4
or higher), and each release of Configuration Support-S (Release 4 or higher). The
national languages supported by CECP are listed in the following table:
Table 2-1. CECP-supported National Languages
Austrian/German (EBCDIC 76)
New Belgian
(International)
Canadian Bilingual
Danish
English (UK)
English (US)
Finnish
French
AZERTY (105)
Italian
Netherlands
Norwegian
Portuguese
Spanish
Spanish-Speaking
Swedish
New Swiss/French (International)
New
Swiss/German (International)
2-16 IBM 3270 Information Display System 3174 Establishment Controller Introduction

IBM 3174 Specifications

General

Brand	IBM
Model	3174
Category	Controller
Language	English