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SNA IMF/iX Interactive

Mainframe Facility

The SNA Interactive Mainframe Facility/iX (SNA IMF/iX)

product provides IBM 3270 device emulation for

Hewlett-Packard terminals, printers, and HP 3000 Series

900 systems. (SNA IMF/V, P/N 30247A, provides similar

functionality for MPE V systems.)

SNA IMF/iX on an HP 3000 Series 900 allows interactive

communications between the HP 3000 and an IBM

System/ 370-compatible mainframe using SNA 3270

protocols. SNA IMF/iX emulates the base function set of

an IBM 3270 control unit using SNA Physical Unit Type

2 (PU2 or 2.1), Logical Unit Types 1,2,3 (LU1, 2,3)

protocols. HP terminals, printers, and applications on

the HP 3000 running SNA IMF/iX emulate IBM terminal

and printer functions.

SNA IMF/iX allows access to 3270 subsystems on the

mainframe (such as TSO, CICS, and IMS) through a set

of high-level intrinsics. There are two modes of

operation. In programmatic mode, customer-written

application programs on the HP 3000 emulate IBM 3270

terminals and printers, exchanging data with the host

SNA Link(s)

SNA

Other HP

IMF/iX

SNA Services

HP 3000/iX

Up to 127 SNA IMF/iX Devices

– HP Terminals

– HP 3000 Programs

– HP 3000 Printers

IBM Mainframe

ACF/VTAM

Processor

Communications

ACF/NCP

Controller

IBM 3274

Control Unit

Up to 32 IBM Devices

– IBM Terminals

– IBM Printers

Features

• SNA IMF/iX and an SNA Link product

allow the HP 3000 to emulate the base

function set of an IBM 3270 control unit

using SNA (PU2 or 2.1, LU1, 2, 3)

protocols.

• Other HP SNA service products can all

be supported simultaneously over one

SNA/SDLC Link/iX or SNA/X.25 Link/iX.

The maximum datacomm line speed is

64 KB/s.

• SNA IMF/iX supports up to 127 devices

(terminals, printers, and application

programs) concurrently. With MPE/iX

Release 4.0 or later, SNA IMF/iX

supports up to 127 devices per SNA Link.

• The Pass Thru capability of SNA IMF/iX

allows HP 3000-attached printers and

terminals to emulate the base function

set of IBM 3270 printers and terminals.

• SNA IMF/iX Pass Thru takes advantage

of the Modified Data Tag feature of

selected HP terminals (such as the HP

700/94) and supports a write

optimization feature that limits screen

updating to modified rows only. These

features significantly reduce response

time.

• SNA IMF/iX provides a "rolling softkeys"

feature that allows the user to define

and label multiple levels of terminal

function keys to be their most

frequently used IBM 3270 program

function keys. Users can also define

various "menus" of function keys that

are clearly displayed in the terminal

screen. The SNA IMF Programmer's

Reference Manual documents the

terminals supporting this feature, some

of which provide up to 16 softkeys on

the screen at a time.

• Terminals/printers being used in the

PassThru mode do not have to be

dedicated. The user may access either

the HP 3000 or the remote host from

the same terminal.

HP 3000

Bus ness

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