HP Data Entry and Forms Management System (VPLUS) Reference Manual (32209-90024)

Appendix K 635

SNA DHCF with VPLUS Applications

IBM 3270 Differences and Limitations

When using VPLUS to design or modify applications for IBM 3270 users, it is important to

understand the limitations that restrict forms design for IBM 3270 display stations. The

information in the following sections explain how an IBM 3270 differs from an HP 3000

terminal and the impact of these differences when running VPLUS applications using

SNA DHCF.

Keyboard Differences

Table K-1 compares HP 3000 terminal keys with equivalent IBM 3270 keys.

Table K-1. Comparison of Major Keys

HP 3000 Key Equivalent IBM 3270 Key and Explanation

AIDS No equivalent key exists.

BREAK PA1 - Equivalent to a system break. A VPLUS application can disable this

key. If disabled, SNA DHCF ignores the key when pressed and re-enables the

keyboard.

CLEAR DISPLAY CLEAR - Functions as a refresh key by clearing the entire screen, including

data and the form itself. Consequently, this key is not a local function, like the

equivalent HP key.

CLEAR LINE ERASE EOF - Clears data in an unprotected ﬁeld from the cursor to the end of

the ﬁeld, regardless of the number of lines in the ﬁeld. This differs slightly

from CLEAR LINE, which performs the same function only if the ﬁeld does not

exceed one line.

CTRL No equivalent key exists.

CTRLY PA2 - Equivalent to a subsystem break. A VPLUS application can disable this

key. If disabled, SNA DHCF ignores the key when pressed and re-enables the

keyboard.

DEL LINE No equivalent key exists.

ENTER ENTER - Locks the keyboard and transmits all modiﬁed data. The cursor

remains in the same position.

ESC No equivalent key exists.

INS LINE No equivalent key exists.

MODES No equivalent key exists.

NEXT PAGE No equivalent key exists.

PREV PAGE No equivalent key exists.

RESET RESET - Unlocks a locked keyboard.

ROLL DOWN No equivalent key exists.