Display System - Tektronix TEK 222 Manual

Block Diagram Overview — 222 DSO Preliminary Service
— —| Z-AMP 5
SEQUENCER
VECTOR COUNT ——» — STATE
MACHINE
BLANK COUNT ——>
SERIAL BUS ——> U260 X-AMP
sid
CONTROL
y + Y-AMP
ADDRESS 32K Y
COUNTER RAM LATCH
— - v
U258 U255 VECT/
U257 CHAR
|
|
Y- VECTOR |
GENERATOR |
U264A,B - U265B,C
Sie DUAL
ACCESS re © -O |
RAM __,| LOGIC . |
SELECT U206D I |
U203A, |
U261B uaes X- VECTOR |
GENERATOR FO |
U264C,D - U265A,D
DISPLAY
ADDRESS SWEEP
CPU ADDRESS BUS} BUFFER GENERATOR
U269, U267B
U251, U252
DISPLAY
DATA
< CPU DATA BUS
' BUFFER
+5V
U269B >O
-3.2V
U253
———=—<—<—$————————— oe +3.2V
DUAL
8-BIT
DAC EXTERNAL
» TRIGGER
LEVEL
U263
Figure 3-4. Display System.
3-7