3 . 4 . 4 C lock S i gna l s
T o Z80
M i cro-Processor
R24
330
T P 1
4.0MHz
Vee
Y l
R27
R26
Vee
Vee
To V ideo D isplay
Generator
TPB
U 37
(3 .58 MHz)
1
CLR
RCO
Z CLK
LOili 14
3 A
QA 13
(4
U36
Q8
12
NC
QC
1 1
NC
R29
R28
QO
To CPU and
S ine Generutor
T P3
F i gure 3-14 .
C lock S i gna l s
{7 .68 M H z)
T h ree c l o c k o s c i l la to r s a re l o ca ted on t h e m o t he r boa rd .
One c l oc k
s i g na l o f 4 . 0M H z i s se n t t o t he CPU t o s e t p r o c e s s o r spe e d . I t c a n b e
mon i t o r e d a t TP 1 .
A s e c o n d c l oc k s i g n a l i s a " co l o r bur s t " f re q u e n c y ( 3 . 5 8 M H z ) produ c e d
b y Y l a n d u se d f o r t he v i de o d i sp l a y g e n e ra tor . I t c a n be mon i t o r e d a t
T P 2 .
T h e t h i rd c l o c k s i g na l o f 7 . 6 8 M H z i s p r o d u c e d by Y 2 a nd d i v i d e d by 1 2 8
t o p ro v i de t h e 6 0 k H z ba s e f requency u s e d by t h e s i ne g e n e ra t or . I t c a n
be mon i t o r e d a t TP3 .
3 - 2 4
e l s l i
2 1 5 0 / 2 1 6 0 9 / 8 5
Содержание VideoBridge 2150
Страница 24: ...BLANK 1 6 e l s l i 2 1 50 2 1 60 5 8 5...
Страница 222: ...5 3 1 Mo the rboa rd Ca ble Assembly piN 4 9 3 0 2 METRI C A l l D ims in mm 1 14 3 1 _ 215 4 E F TO MOTHE OA Rt 5 4 56...
Страница 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...
Страница 252: ...A t S E C T I ON A A 4 5 0 0 m m 5 rY1 m A...
Страница 307: ...Figure 8 1 General Handler Interface Circuit Assembly P N 47895 B 2 e s i 2150 2160 5 85...
Страница 318: ...DIOII DI Z G O O L 2 _ j_ _ D I04 4 _ _ _ DI05 __ t _ _ DI06t2 DI01 __ _ r _ OI08 r U4 n l r L t TM 9914 Fig...
Страница 330: ...F i gure 8...