HP T5725 - Compaq Thin Client, User Manual

Page: 189 / 274

18-3
TA6530 Emulation
Display memory is treated as one long page consisting of 400 lines, of which 24 lines
may be viewed at any one time. Lines above or below those currently displayed may
be scrolled into view using cursor or display control keys. Once all the display
memory has been used, new data will force all previous lines of data up one line so
that the first line is erased, ensuring that the oldest data is erased first.
The status line will display CONV when you are in Conversational mode.
Block Mode
In Block mode, characters are stored in a communications buffer and are not transmit-
ted to the host until the application requests them. The characters are then sent as a
block. This enables you to enter a large amount of data and edit it locally before it is
transmitted.
Block mode has two sub-modes: Block Nonprotect and Block Protect. In Block
Nonprotect mode you can enter any type of character at any position on the screen
(except on the 25th line). In Block Protect mode the application divides the screen
into protected and nonprotected areas called fields. The cursor cannot be moved into
protected fields, which may contain prompts or information or be empty. The cursor
can only be moved into unprotected fields, which may also define the type of
characters that can be entered.
In Block mode, display memory is divided into pages, the number of pages being
determined by the application.
The status line will display BLOCK when you are in Block mode, and PROT when
in Block Protect mode.
ANSI Mode
In ANSI mode, characters are sent to the host as you type them, and standard ANSI
(American National Standard Institute) functions are executed. Applications that run
on the LXN host system generally recognize and use these functions.
The status line will display ANSI when you are in ANSI mode.
Keyboard Mapping
The following illustration shows where Tandem 6530 keyboard functions are mapped
to keys on the Enhanced AT keyboard layout.