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The Parameter RAM stores parameters that are used repetitively during the display
and drawing processes.
Table 3-4 defines the GDC abbreviations and symbols. Table 3-5 lists and describes
the GDC commands. Table 3-6 lists the command constants. The APC uses the
GDC in Character Mode only.
Table 3-4 GDC Symbols
SYMBOL
NAME
DESCRIPTION
AO TO
A15
Address 0 to
Controls display position of cursor.
Address 15
BLD
Blinking Disable
Cursor blinks (BLD
=
0) or does not
blink (BLD
=
1).
BL
Blinking Rate
Controls frequency of blinking.
CFl
Cursor Finish
Controls at which line the cursor finishes.
CHR
Character Mode
Character Mode (CHR) and Graphic
Mode (G) define the display modes as
follows:
CHR
G
Mode
- -
0
0
Character Mode 0
1
0
Character Mode 1
0
1
Not Used
CIR
Circle
Indicates that a circle is being drawn if
CIR
=
1.
CSR
Display Cursor
Controls presence (CSR
=
1) or absence
(CSR
=
0) of the cursor.
CST
Cursor Start
Controls at which line the cursor starts.
C/R
Character Per
Defines horizontal display period.
Row
Controller PCB
3-11
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