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Texas Instruments 99/4A - Page 74

Texas Instruments 99/4A
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TAELE
11
COLOR
STANDARD
PHASE
VDP
FIRST
APPROXIMATION
GOAL*
Yellow
12
+/
—
10
0
0
10
+
/-
5
Red
76
+
/-
10
6
0
7
Q
+
/
—
5
Magenta
120
+/-
10
1
20
1
2
0
t
-
/
—
5
Bl
ue
192
+
/-
10
1
3
U
190
+
/-
5
Cyan
256
+/
—
1O
240
o
O
+
'
—
Green
300
+
/-
10
3
0
0
300
+
/-
5
*
Electr
■
i
c
a
1
design
will
attempt
to
provide
these
color
signals.
VIDEO
SYNC
AND
CONTROL
GENERATION
The
vertical
and
horizontal
control
signals
are
generated
by
decoding
the
horizontal
counter
increments
and
the
vertical
counter.
Table
12
gives
the
relative
count
values
of
the
screen
display
parameters.
Within
the
active
display
area,
the
three
least
significant
bits
of
the
horizontal
counter
addresses
the
.
...
individual
picture
elements
of
each
pattern
displayed.
Also.,
the
active
vertical
counter
addresses
each
individual
line
in
the
8x3
patterns.
The
VDP
operates
at
234
lines
perframe
and
approximately
SO
frames
per
second
in
a
non-interlaced
mode
of
operation.
TABLE
12
SCREEN
DISPLAY
PARAMETERS
HORIZONTAL'
DOT
CLOCK
CYCLES
Horizontal
active
display
Right
border
Right
blanking
Horizontal
sync
Left
blanking
Color
burst
Left
blanking
Left
border
256
15
3
TOTAL
14
3
13
342
VERTICAL
Vertical
active
display
Bottom
border
Bottom
blanking
Vertical
sync
Top
blanking
Top
border
TOTAL
LINE
192
26
13
264

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