~
945424-9701
CLK
DOT
RO
-11
n
n
DOTR1
n
n
n
DOTR2
n
n
n
OOTR3
n n
n
DOTR4
n
n
n
DOTR5
n n
n
DOTR6
n
n
n_
(A)136300
Figure
1-51.
Model
911
VDT
Dot
Counter
Outputs
Sync
Generator.
Outputs
from
the
control ROMs (see tables 1-10 through 1-12) control the
flip-flops
that
comprise the sync generator
to
produce the following sync timing control signals.
•
HSQ - Horizontal Sync
•
HSBQ - Horizontal Blanking
•
VSQ, NVSQ - Vertical Sync
•
VSBQ - Vertical Blanking
•
CSQ - Composite Sync
•
NBQ - Composite Blanking
Figure 1-54 illustrates the timing relationships for
the
sync generator. ·
Composite Blanking {NBQ) indicates
that
either HSBQ
or
VSBQ
is
high (logic 1 ), and blanks
output
video.
1-85
Digital
Systems
Division
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