6530 Programmer's Guide

Block Mode Operation
6530 Programmer’s Guide 3-31
Read Color Configuration (Esc - u)
The implementation of field-selectable color requires the reading and
saving of additional color related information. Specifically, the PC6530
must be able to read the contents of the configurable registers before
initializing the terminal for PATHWAY usage. The escape sequence has
the following format:
Esc - u
1B 2D 75 (hex values)
The 6530 responds with:
SOH 1 cnt data CR
where:
SOH is start of header (01H)
1 is an ASCII 1 (hex value 31)
cnt is the data pair count
data are the data pairs
CR is the control character (0DH) that terminates the message in
conversational mode.
If the PC does not support color or uses a CGA display adapter, the
escape sequence will be ignored. Only EGA and VGA have
programmable color registers. The cnt field will be 2 bytes of the number
of color register pairs (ASCII readable hex) following in the data field.
The data field will consist of pairs of ASCII hex values corresponding to
the current values stored in the color registers. A color register pair will
be register number plus register value. These values will be 2 bytes each
in ASCII readable hex format. For example, register 12 (hex 0C), which
contains the value of 5D will be stored as hex 30, hex 43, hex 35, hex 44.
This constitutes one color register pair.