The following categories are visible only when configuring a VT type session.

VT Model Options

This dialog allows you to select the VT terminal type and communication options for the session.

Terminal Model This option selects the VT terminal model for the session. Since the emulator always operates in superset mode, this option is mainly used to select the appropriate sequences for the keyboard commands.

Communication Mode This option selects the communication mode with the host. The default is 7-bit mode.

Answerback Message You can enter the answerback message in this edit box. You can use the special escape sequences described later on in this chapter to send non-printable characters.

Conceal This option, when enabled, conceals the answerback message. If this option is disabled, the answerback message will be cleared automatically.

Character Sets

This dialog allows you to select the character set options for the session.

UPS Set You can select the User Preferred Supplemental character set to be either the DEC Supplemental or the ISO Latin-1 character set.

NRC Set You can select the National Character Replacement character set in the list box.

VT Display Options

This dialog allows you to select various display options for the session.

Display Blink as Italic

This option allows you to map the VT Blink attribute to an Italic font.

Show Hotspots

This option allows you to see where all the hotspot fields are on the screen. When enabled, all hotspot fields are drawn in black text on a gray background.

Display Row/
Col Indicator

This option enables the display of the row and column indicator for the cursor in the lower right hand side of the OIA.

Compress Blank Lines in Scrollback

When this option is enabled, the system does not add blank lines to the scrollback buffer.

Show Scrollbar for Scrollback

This option enables the system to display a vertical scrollbar when you enable scrollback mode. This allows you to travel easily through the scrollback buffer.

Save Attributes in Scrollback

This option enables the system to save all VT attributes in the scrollback buffer. If disabled, the system saves only the text. Note that when enabled, this option consumes four times the amount of memory for each line.

Lines Available in Scrollback

This option controls the amount of lines that are kept in the scrollback buffer. You can save up to 9999 lines in the scrollback buffer. The default value is 100 lines.

Status Line

This option controls whether the status line is visible or not and whether the host system can write to the status line.


This dialog allows you to select the screen size for the session.

Default Screen Width This option sets the default screen width when a session is created.

Default Screen Height This option sets the window size for the session. The sizes are only available if the VT Buffer Size is set to 6 Pages.

VT Buffer Size This option sets the internal display buffer size. If you do not require any of the VT420 specific features, then select 1 Page. This will conserve memory and accelerate certain functions. This option has no effect on the scrollback buffer size.

Keyboard Options

This dialog allows you to select various keyboard options for the session.

Send Enter Key as This option determines determines whether a carriage return or a carriage return and line feed are sent when the Enter key is pressed.

Backspace This option determines what character is sent when the Backspace key is pressed.

Cursor Key Mode This option determines what sequences are sent when the cursor keys are pressed.

Keypad Key Mode This option determines whether the numeric keypad is used for numbers or whether it is used in Application mode.


This dialog allows you to change various VT system options.

Auto Wrap This option enables the cursor to automatically wrap at the end of a line when the line length is exceeded.

Local Echo This option will echo all data entered in the system. This option is normally not enabled.

Terminal is Online When this option is disabled, the terminal is offline and cannot receive or send any data.

Control Codes This option determines whether the system acts upon or displays control codes that are received. The Display Option is normally only used for debugging purposes.

Scrolling Method This option controls how the system scrolls by default. Normal mode scrolls data line by line. This is also referred as Jump scrolling. The Smooth option causes the system to scroll data ‘n’ pixels at a time. Smooth scrolling is much slower and requires a better video display adapter.

Display Mode This option determines how the system will display
incoming data. In Realistic mode, the system updates the display after each byte or command received. This accurately emulates a true terminal. However, this mode is much slower due to the overhead required.  In Optimized mode, the system only updates the display at the end of a communication buffer. This mode often skips scrolling operations and simply displays the final buffer. This provides a lightening fast display.

VT Save Category

This dialog allows you to tailor the options that affect saving screens to disk.

Save Mode This option determines whether new saves will
append (default) to the end of the save file or overwrite the save file.

Capture Mode This option determines how the system will capture data to disk. In Text mode, the system captures all lines terminated with LF, VT, or FF. In Raw mode, the system captures all data received including control and escape sequences.

Default Save Filename Enter the path and name of the save file here.


This dialog allows you to change the VT tab positions.

Tab Stops Enter the tab stops starting at column 1. Use the Every 8’th button to set tab stops at every 8’th column starting with column 9.


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