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1.10.
IC914 and IC915 on the Main Board are using the Character Generator IC MB90077PF104.
Description of this IC is as follows:
N.C.
1
SCLK
2
STB
3
SIN
4
VMOD
5
Vcc
6
XDOUT
7
XD
8
EXD
9
Vss 10
Pin
Name
I/O
1 N.C.
– Non Connection
2 SCLK
I
Serial Clock Pulse input terminal.
3 STB
I
Strobe Pulse input terminal.
Serial Data should be read at rising
edge of this signal.
4 SIN
I
Serial Data Input terminal for
indication control.
5 VMOD
I
Effective edge changing input
terminal for Vertical Sync Signal.
6 Vcc
– Power supply terminal.
7 XDOUT O XD Inverted signal output terminal.
8 XD
O XD signal output terminal.
9 EXD
I
External signal input terminal.
10 Vss
– Ground terminal.
11 LHP
O Line Hider Pulse output terminal.
12 VOR
O
Color signal output terminals of
13 VOG
O
RGB system.
14 VOB
O
Blanking signal output terminals
15 VBR
O
which indicating output of the
16 VBG
O
character signal against the RGB
17 VBB
O
system.
18 VSYNC
I
Vertical Sync signal input terminal.
19 HSYNC
I
Horizontal Sync signal input terminal.
20 N.C.
– Non Connection
20 N.C.
19 HSYNC
18 VSYNC
17 VBB
16 VBG
(TOP VIEW)
15 VBR
14 VOB
13 VOG
12 VOR
11 LHP
Description
"H" = Rising edge
"L" = Falling edge
SCLK
2
STB
3
SIN
4
Register
Control Bus
Data
Bus
5
VMOD
18
VSYNC
19
HSYNC
7
XDOUT
8
XD
9
EXD
VCC
6
V
SS
10
23
Blink
Period
Counter
14
VOB
17
VBB
13
VOG
16
VBG
12
VOR
15
VBR
11
LHP
1
N.C.
N.C.
20
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