Character Generator Rom; Color Adapter Connector (P3) Pin Assignments - HP Vectra Reference Manual

Table 7.5
Color Adapter Connector (P3) Pin Assignments
Pin Signal 1/0 Signal Description
1 GND
Ground
2
INTENSITY
0
Intensity dot stream
3 RED
0
Red dot stream
4
GND Ground
5
GREEN
0
Green dot stream
6
BLUE
0
Blue dot stream
7
GND
Ground
8
COMPSYNC
0
Composite sync
9
HSYNC
0
Horizontal sync
10 GND Ground
11
VSYNC
0
Vertical sync
12 MCLK
0
Dot rate clock
13 GND Ground
14
-PRESENT I Board present
Character Generator ROM
The character generator
ROM
for the HP45981
A
is an 128 Kbyte
bit
ROM
(16 Kbyte x 8) containing four character sets. Each set
consists of 256 patterns. Depending on the monitor in use either
an 8 or 16 high cell is selected. The font bit (bit 2) of the
extension control register and the monitor determines the
character set that is selected. A 15kHz monitor selects the eight
row version, while a 25kHz monitor selects the 16 row version.
Each character set is stored in contiguous
4
Kbytes in the
ROM
defined by the following chart. (The character sets are given in
Section 5.)
Set Font
o
STD
1 STD
2 HP
3
HP
Size Location
8x8 OOOO-OFFF
16x8 1000-1 FFF
8x8
2000-2FFF
14x8 3000-3FFF
Multi-Mode Video Adapter Card 85