HP 3000 Series Manual - Page 20

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HP 3000 applications that use special screen-

mode or block-mode features that are specific

to HP terminals are not supported. Some of

these restrictions include:

• HP terminal escape sequences used for cur-

sor positioning, terminal strap settings, pro-

grammable softkeys, etc.

• Screen enhancements such as inverse video,

blinking, underlining, etc.

SNA DHCF/iX can provide universal access to

HPDESK for an integrated office automation

solution.

Within VPLUS applications, SNA DHCF/iX

supports all of the VPLUS intrinsics except for

VPRINTSCREEN and VPRINTFORM. Due to

limitations of the IBM 3270 display station,

VPLUS forms caching is not supported with

SNA DHCF/iX. In addition, several points

need to be considered in VPLUS forms design

including:

• Prior to using a VPLUS application with

SNA DHCF/iX, the VPLUS forms file must

be recompiled using the 'IBM 3270' terminal

option.

• When using FORMSPEC to design VPLUS

forms, an HP terminal such as the HP

700/94 is required.

• Unlike HP terminals, IBM 3270 display sta-

tions require an actual space on the screen

for an attribute byte that describes the

attributes of the following field.

• Each field on the IBM display station needs

to be preceded by this attribute byte; conse-

quently, back-to-back fields are not allowed

on the IBM 3270.

• With SNA DHCF/iX, a VPLUS form can have

at most 24 lines; if features such as softkeys

(two lines) or a window line (one line) are

used in the application, then the available

lines for the form are reduced by the num-

ber of lines required by these features.

If the target application violates any of these

restrictions, then it is not supported by SNA

DHCF/iX. An error condition will be returned

to the application when an unsupported

feature is used. Prior to installation of SNA

DHCF/iX, target HP 3000 applications should

be qualified to ensure that they meet these

restrictions.

When using SNA DHCF/iX, IBM 3270 display

station users may experience different

performance and functionality than HP

terminal users. For IBM 3270 display stations,

response times may be somewhat greater than

an HP terminal due to the SNA network

overhead.

Functional Specifications

• SNA DHCF/iX supports many of the basic

functions of HP terminals. Please refer to

the Usage Considerations section for fea-

tures that are not supported. Supported fea-

tures include:

– Modified Data Tags

– Security Fields

• SNA DHCF/iX supports three different dis-

play enhancements for IBM 3270 display

stations: full-bright, half-bright, and non-dis-

play. (Non-display is for security fields.)

• SNA DHCF/iX supports those IBM devices

officially supported by IBM for the Host

Command Facility, Version 2. Please refer to

IBM's HCF Product Specification Guide

(GC27-0647) for a complete listing.

• Each SNA DHCF/iX session appears as a

Virtual Terminal session. The pool of Virtual

Terminal sessions available for other users

will be reduced by the number of SNA

DHCF/iX sessions that are currently active.

• SNA DHCF/iX can support multiple simulta-

neous sessions, depending upon the number

of VT sessions or LDEVs (depending on the

MPE/iX release) distributed across multiple

SNA Links.

• Each SNA Link can support up to 64 con-

current sessions distributed among the vari-

ous SNA/iX services.

HP 3000

Bus ness

Servers