Digital Circuitry
Display System
68070 OMA Handshake lines:
REQ1
0
ACK1
0
..
Readout
The display system is designed to write readout data
and
acquisition
waveforms on the
CRT.
The output signals are :
The analog horizontal and vertical deflection (ROHOR
and
ROVERT).
The digital signals
ROBLNK
and
TRBLNK
for blanking
the
readout
and trace signals.
ROA_0
for indicating "readout active".
REFSEP indicating that a reference waveform is being displayed
and
the reference separation needs to be switched on.
RFO
State
Digital Control
Machine
Signals A10 Board
'
~
1-----11
~
Display
Display Sweep
d8-d15 Control-byte
State
Generator
"'
Latch
11'
I---,;
Machine
----
68070
'
Horizontal
M icroprocessor
"
Display
,___I\
Digital to
,____
Multiplexer
Display Signal
,__
databus
d0-d7
RFO
Analog
,_..,
Horizontal
~
7
~
i-------,...
Converter
.--
__...
Signals
I
t
Vertical
"
L---1'
Digital to
~
Multiplexer
Display Signal
d8-d15
Analog
I
-
Vertical
r
i----,.,
Converter
Signals
Analog Cursor
Control Lines
from A10 Board
Figure 3-6: 2212 Display System Block Diagram
3 -
22
Theory
of
Operation
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