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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
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