Creating A 512 Character Set - IBM RT Series Hardware Reference Manual

scans, then
n
bytes must be filled in for each character in the
character generator. The example assumes eight row scans per
character.
Address
Byte Image
Data
CC * 32
+
0
18H
3EH
2 66H
3
66H
4
7EH
5 66H
6 66H
7 66H
CC
=
Value of the character code. For example, 41H in the case
of an ASCII "A".
Creating a 512 Character Set
This section describes how to create a 512 character set on the
IBM Color Display. Note that only 256 characters can be printed
on the printer. This is a special application which the Enhanced
Graphics Adapter will support. The 9 by 14 characters will be
displayed when attribute bit 3 is a logical 0, and the IBM
Color / Graphics Monitor Adapter 8 by 8 characters will be
displayed when the attribute bit 3 is a logical 1. This example is
for demonstrative purposes only. The assembly language routine
for creating 512 characters is given below. Debug 2.0 was used
for this example. The starting ,assembly address is 100 and the
character string is stored in location 200. This function requires
128K or more of graphics memory.
70 IBM Enhanced Graphics Adapter