6530 Programmer's Guide

Overview
6530 Programmer’s Guide 1-7
Video Attributes Video attributes can be used in any of the operating modes. They specify
how characters appear on the screen. The video attributes available with
the 6530 are:
Blinking or nonblinking
Normal or alternate intensity
Normal or reverse video
Normal or underscored
Normal or invisible (not displayed)
Some restrictions for attribute combinations exist. Monochrome monitors
are unable to display reverse video and underscored characters
simultaneously, because display of the reverse video attribute masks the
appearance of the underscore attribute. If the workstation or PC is
equipped with EGA, CGA, or VGA, video attributes can be mapped that
allow display of color. See subsequent chapters for details on color
mapping in each operating mode.
Data Attributes Data attributes are available only in the protect submode of block mode.
They provide various forms of control over data entered by the user. In
addition to video attributes, a field can be assigned combinations of the
following data attributes:
Protect - Controls write-accessibility. Only your application program
can write into a protected field.
Data Type - Identifies the type of data that can be entered into an
unprotected field.
Auto-Tab Disable - Prevents automatic cursor jump.
Modified Data Tag (MDT) - Identifies fields for subsequent read
operations.
Upshift - Converts all lowercase letters entered from the keyboard to
uppercase before displaying them in the field.
Alternate Input Device (AID) - Defines a field to accept input from
the keyboard only, from an AID only, or from either the keyboard or
AID.
Chapter 3 provides more details on the data attributes and how to select
them.