DEC VT220 Technical Manual page 216

ADDRESS 17C6H(WRI
07 06 05 04 03
02 01 00
I I
I I
PIN
CURSOR SKEW
BLANK SCEW
CONFIGURATION
I I
J
I
(BA07 HI ....
I-------. . . . . . . .
- ------------t....
(BADO HI
BIT VALUES
BIT 6-7
BIT 3-5
BIT 0-2
00
01
10
11
xx
xx
DEFINES PINS AS SC3H (2BI. SC2H (291
SC1 H (301. SCOH (31). CSYNC L (321. AND
DMA H (33)
NOT USED IN VT220
NOT USED IN VT220
NOT USED IN VT220
VALUE OTHER THAN 0 USED DURING
HORIZONTAL RETRACE TO INDICATE START OF
DOUBLE WIDTH OR DOUBLE HEIGHT DATA NOW
IVALUE NOT USED IN VT220 DURING
HORIZONTAL TRACE PERIODI
BINARY DEFINITION OF NUMBER OF CHARACTER
CLOCKS (0 TO 51 THAT DELAY HORIZONTAL
BLANKING PORTIONS OF CBLANK H WITH
RESPECT TO THE DEASSE RTED VLT H INTERVAL
Figure C-20 9007 VPAC: Configuration/Skew
Register
ADDRESS
07
17C7H (WR)
06 05 04 03 02 01
00
(BAD7
Hj ....
I-------------------......,. . . . . .
(BADO Hi
BIT VALUES
BIT 0-7 17H BINARY DEFINITION OF NUMBER OF VISIBLE
DATA ROWS DISPLAYED DURING EACH
VERTICAL TRACE (17H CODE FOR 24 DATA
ROWS,
Figure C-21
9007 VPAC: Data Rows
Per Frame Register
C-13