Tektronix 492 - Page 207

Theory of Operation—492/492P Service Vol. 1 (SN B030000 & up)
5-44
BUS r e q Q j)·
INTENSITY ( 0
DISPLAY A fB }
DISPLAY B {34}
DISPLAY B-p(5eV
0 to 1
TRANSITION
DETECTOR
SYNC (26}
CLOCK
DOWN d H
UP 0 - * ·
UP/D O W N
INTERLOCK
PROGRAM ABLE
LOGJC ARRAY
CPl a
PRODUCT
TERMS
STATE
v a r ia b le
REQtSTER
SUM
TERMS
DISABLE
CC'JNT
Λ
{36]DISPLAY ENABLE
(35JCGMPA^E
~{24) READ/WRITE
B-A
DISPLAY
S T A T E
REGISTER
{2OJ MARKER
A/S
9 E!T
DISPLAY
COUNTER
/N
10 b i t
U P / DOWN
R E G I S T E R
.10
.10
UP
WSB
10 BIT
UP/DOWN
COUNTER
LSB
-H § ) le f t / r i c ^ h t
I
- * > - 0 I
~ H § )
8
7
40) 6
“ H D
MIX
- H D
- H D
- H D
- H D
i
LSB —H P A/ B
\ HORIZONTAL
I DISPLAY
(21) START DIVIDE
-©9'
<D 8
-© 7
-06
-(») S
0 *
- 0 3
- 0 2
0 1
-fii) 0
HO RIZO N TA L
AC Q U IS IT IO N
Fig. 5-16. Horizontal control IC block diagram.
REV FEB 1983