3 . 4 MOTHERBOARD
POW ER
ON RESET
U l
Z 8 0 C P U
7.68MHz
MASTER
CLOCK
3.58MHz
I/O B U F F E R
RS-232
CONNECTIONS
U 1 2
KEYBOARD I/O
U 1 3
INTER R U PT
CONTROLLER I/O
U 2 . U 3 . U4. U5. U 6 . U 7 . U 8
M A I N M EMORY
U 3 1
VIDEO M EMORY
N ON-VOLATILE
I
M E MO RY
I
L
�
O
�
O
�
�
J
U 2 6
VIDEO
DISPLAY
G E N E R ATOR
Q l . Q2. Q3
VIDEO
VIDEO TO
A M PLIFIER/
���ti�IO NER
B U F F ER
F i g ure 3 - 1 3 .
M o t h e rboa rd S i mp l i f i ed D i ag r
a
m
A s i mp l i f i e d d i a g ram o f t h e m o t he rboard i s s h ow n i n F i g u re 3 - 1 3 .
T h e
mo t h e r bo a r d a r c h i t e c t u re c e n t e r s on i t s s ta nda r d c ommu n i ca t i on b u s
w h i c h h a s 6 s l o t s f o r p l u g g i n g i n c i r c u i t c a r d s c o n ta i n i n g mea s u re me n t
c i r cu i t ry ,
I EE E - 4 8 8
i n t e r fa c i n g
c i r cu i t r y ,
R S - 2 3 2 C
i n te r fa c i n g
c i r c u i t r y , a n d o t he r b u s c ompa t a b l e de v i c e s .
T h e m o t h e r bo a r d h o l d s
t h e Z 8 0 C P U c h i p a n d i t s memory , t h e v i de o g e ne ra t o r a n d i t s m e mo r y ,
t h e m a s te r c l ock , a n d a s s o c i a t e d c o n t r o l l og i c .
e
l
s
l
i
3
-
1 9
2 1 5 0 / 2 1 60
5 / 8 5
Summary of Contents for VideoBridge 2150
Page 24: ...BLANK 1 6 e l s l i 2 1 50 2 1 60 5 8 5...
Page 230: ...R54 R 1 9 R23 6 TP8 o O NC N N N N a a a a a F i gure 5 5...
Page 252: ...A t S E C T I ON A A 4 5 0 0 m m 5 rY1 m A...
Page 307: ...Figure 8 1 General Handler Interface Circuit Assembly P N 47895 B 2 e s i 2150 2160 5 85...
Page 330: ...F i gure 8...