DEC VT220 Technical Manual page 219

ADDRESS 17CFH (WA)
07 06 05 04
,,,.:,,
"
SI~E
03 02 01 00
(BAD7 Hj .....
__-------------------<
....
(MOO
HI
BIT VALUES
BiT 6-7 00
01
10
11
SiNGLE HEiGHT/SiNGLE WIDTH
SINGLE HEIGHT/DOUBLE WIDTH
ODD DATA AOWS ARE DOUBLE HEIGHT/
DOUBLE WIDTH ON TOP HALF. EVEN DATA
ROWS DOUBLE HEIGHT/DOUBLE WIDTH ON
BOnOM HALF
EVEN DATA ROWS ARE DOUBLE HEIGHT/
DOUBLE WIDTH ON TOP HALF, ODD DATA
ROWS ARE DOUBLE HEIGHT/DOUBLE WIDTH
ON BOnOM HALF
Figure C-26
9997 VPAC: Row Attribute Register
ADDRESS
17D1 H (WR)
07
06
05 04
03 02
01
00
l
"":,w.
:
:
'BAD7 Hi'"
.. IBADO HI
BIT VALUES
BIT 0-7
xx
BINARY DEFINITION OF FIRST 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-27 9907 VPAC: Data Row Start
Register
C-16