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DEC VT220 - Page 220

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ADDRESS
17D2H
(WRi
07
06
05
04
03
02
01
00
IDA"
:OW'
: :
IBAD7
HI4
..
IBADD HI
BIT VALUES
BIT
(}-7
xx
BINARY DEFINITION
OF
LAST DATA ROW
NUMBER TO
BE
AFFECTED BY SMOOTH SCROLL
OR
BLANK OPERATION
NOTE
TYPE
OF
OPERATiON
is
DEFINED
BY
BIT 6
OF
CONTROL REGISTER
Figure
C-28
9~~7
VPAC:
Data
Row
End
Register
ADDRESS
17D7H
IWR,
07
06 05 04 03
02
01
DC
IBAD7
Hi ...
41------
-------------_
..
IBADO HI
BIT
VALUES
BIT
(}-7
xx
BiNARY DEFINITiON
OF
NUMBER
OF
SCAN LINES
PER
DATA ROW; USED
TO
OFFSET SCREEN ON
EACH VERTiCAL SCAN BY
ONE
DATA ROW
WHEN BIT 6
OF
CONTROL REGISTER
is
SET
Figure
C-29
90~7
VPAC:
Smooth
Scroll
Offset
Register
C-17

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