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Functional Description

HP SNA DHCF/iX is a software product that

provides an IBM 3270 display station with

access to applications on an HP 3000. SNA

DHCF/iX emulates many features of a

remotely attached HP terminal; thus, it

appears as if the IBM 3270 display station has

a direct connection to the HP 3000 computer.

SNA DHCF/iX can be operated across an

existing SNA or X.25 network.

SNA DHCF/iX communicates with Host

Command Facility (HCF) on the IBM

mainframe in order to exchange data between

the user's MPE session and the IBM terminal.

To the HP 3000 system, each SNA DHCF/iX

session appears as a NS VT session. For IBM

3270 display stations, SNA DHCF/iX provides

access to two primary groups of applications

on the HP 3000 Series 900 system.

• TTY-mode applications are characterized by

their simple use of terminal control charac-

ters (carriage return, line feed, form feed,

tab, bell). SNA DHCF/iX translates the data

as output being sent to the IBM terminal.

This group of applications includes the basic

MPE/iX CI (Command Interpreter) com-

mands.

• VPLUS applications are characterized by

the use of the VPLUS forms subsystem that

is included with the MPE FOS. VPLUS has

been enhanced so that an applications pro-

grammer can design VPLUS-based applica-

tions for the IBM 3270 display station in

addition to other HP terminals.

Consequently, IBM 3270 display station

users can be provided with access to many

VPLUS-based applications using SNA

DHCF/iX.

When developing VPLUS applications for use

with SNA DHCF/iX, the application designer

can develop and modify VPLUS forms using

techniques similar to those for HP terminals.

When the VPLUS forms have been designed

and are ready to be compiled, the applications

designer will select the "IBM 3270" box in the

Terminal Selection Menu of FORMSPEC, in

addition to any HP terminal options normally

selected, in order to include the IBM 3270

format in the VPLUS forms file. Please note

that, in an existing application, some VPLUS

forms may need to be modified due to

limitations of the IBM 3270 display station.

Many of the VPLUS forms may require no

changes.

Usage Considerations

HP SNA DHCF/iX is not a complete

replacement for HP terminals such as the HP

700/92 and HP 700/94 terminals. Due to

limitations of the IBM 3270 display station,

SNA DHCF/iX cannot support all HP 3000

applications. In addition, some HP 3000

applications may require modifications prior

to use with SNA DHCF/iX. Please refer to the

SNA DHCF/iX Application Programmer's

Guide for information on usage considerations

discussed here.

The HP keyboard differs from the IBM

keyboard. The chart below shows some

differences.

HP Terminals

IBM Terminals

HP Function Keys

IBM PF Keys 1-8 (VPLUS

Applications only)

Security fields,

Equivalent functions provided

Full-Bright and

Half-Bright fields

Previous Page Key,

No equivalent functions

Next Page Key,

provided for IBM terminals

Insert Line Key, and

Delete Line Key

HP terminal characters: IBM Terminal mapping:

Break

PA1

Control-Y

PA2

Hard RESET

CLEAR

HP 3000

Bus ness

Servers