DEC VT220 Technical Manual page 221

ADDRESS
ADDRESS
ADDRESS
ADDRESS
07
17D8H (WR. VERTICAL)
17D9H (WR, HORiZONTAL)
17F8H (RD, VERTICAL)
17F9H (RD, HORIZONTAL)
06 05 04 03 02 01 00
(BAD7 H;..... - - - - - - - - - - - - - - - - - -... (BADO HI
BIT VALUES
BIT 0-7
xx
BINARY DEFINITION OF DATA ROW (VERTICAL
CURSOR REGISTER) OR COLUMN NUMBER
(HORIZONTAL CURSOR REGISTER) OF THE
CURSOR
Figure
C-3r3
913137 VPAC: Vertical/Horizontal
Cursor Registers
ADDRESS 17FAH (RD)
0
7
06
05
04 03
02 01 00
INTR VERT
(NOT USED)
FRAME
FLAG RETRACE
TIMER
I I I
IBAD7 HI ......
~ --------------,----
..... (BADO HJ
BIT VALUES
BIT 7 0
1
BIT 6 0
BIT 1-5
BIT 0
0
1
Figure C-31
NO OTHER STATUS BIT SET
OTHER STATUS BIT SET.
NO VERTiCAL RETRACE IN PROGRESS
VERTICAL RETRACE IN PROGRESS
NOT USED
FINAL TABLE ADDRESS NOT READ.
FINAL TABLE ADDRESS READ
913137 VPAC: Status Register
C-l8