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ADDRESS
17C8H
(WRI
07
06 05
04
03
02
01
00
IBAD7
HI....
..------------------
...........
(BADO HI
BIT VALUES
BIT
()-4
xx
BINARY DEFINITION
OF
NUMBER
OF
SCAN LINES
MINUS
ONE, IN EACH DATA
ROW
i9H
for
10
SCAN
L1NESI
NOTE
BITS 5 THROUGH 7
ARE
USED AS 3 MSB.
OF
SCAN LINES
PER
VERTICAL
PERIOD REGISTER
AND ARE
WRITTEN
TO
AT
SAME TIME
AND
ADDRESS AS
BiTS
0-4
ABOVE.
Mll-OlSll·"
Figure
C-22
9007
VPAC:
Scan
Lines
Per
Data
Row
Register
ADDRESS
1lCBH
(WR, 3
MS8sj
ADDRESS
17C9H
(WR
lOW
BYTE,
06
05
04
03
02
01
00
:•
o"~.",,,,
:
:
15
14 13
12
11
10
09 08
BiT
BIT
BiT
':'0,"":
'
10
9
8
IBAD7
Hi"
..
IBADO HI
BIT VALUES
BIT
0-10
BINARY DEFINITION
OF
NUMBER
OF
SCAN LINES IN
ENTIRE VERTICAL PERIOO (TRACE AND RETRACEI
NOTES·
1 VERTiCAL BLANKING PERiOD IS DEFINED
BY
SUBTRACTING THE TOTAL NUMBER
OF
SCAN
LINES
PER
VERTICAL TRACE IVALUE
OF
DATA
ROWS
PER
FRAME REGISTER X VALUE
OF
SCAN LINES
PER
DATA ROW) FROM ABOVE
VALUE
2
FIVE
LSDs
OF
HIGH BYTE
ARE
USED AS SCAN
LINES
PER
DATA
ROW
REGISTER
(REF
FIGURE C·221
Figure
C-23
9007
VPAC:
Scan
Lines
Per
vertical
Period
Register
C-14

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