DEC VT220 Technical Manual 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 ... 4 1 - - - - - - - - - - - - - - - - - - - _
.. 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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