DEC VT220 - 9007 VPAC: Configuration;Skew Register

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