DEC VT220 - Page 111

TO
VIDEO
OUTPUT
Ul ATR H
(SERIAL DATA)
...
\CHRl
"
H-CHR7 H /
p·S
y
CONVERSION
CHRO H
-
CBLANK l
-I
Sl
CLR CK CillNH
IClR}
Y
i
Or
DOT ClK H
T5l
I
T3H
II!
T2L
CONVERSION
----'
CONTROL
CURS H
, 1
CBLANK H{
FROM {
CHAR
GEN
FROM
ATIRIBUTE
CIRCUITS
FROM
TIMING
GEN
FROM
9007
FROM I
BLANK
CIRCUITS
{
Figure 6-22
Video Converter Block Diagram
INH
LATCH
TO
P-5
CONVERTER
HR LD l
lOAD
FIF
CURSOR
SKEW
FIF
~
rT3H
FROM i'
TIMING _T_2_L +-_-t __ -t_-.;
GEN L .. _ ./
lOOT ClK H
FROM CG BLANK H
BLANK -----L __ ...J
CIRCUiTS
'SHARES SAME PHYSICAL COMPONENT
ILS174 LATCH} AS ATTRI3UTE LATCH 4 IN CHARACTER
GENERATOR, AND BLANK LATCH IN BLANK CIRCUITS.
CBLA=D-JNK H
FROM [
9007 L
CURS H r-"'--t--.L-+-+-t--l--~
Figure 6-23
Conversion Control Block Diagram
6-27