Texas Instruments 990 User Manual

~~-~~~~~~~~-
~ 945424-9701
(A)136295
960
CHARACTER
1920
CHARACTER
7 x 16
CHARACTER
SPACE
7 x 10
CHARACTER
SPACE
5 x 5
LOWER CASE
MATRIX
5 x 5
LOWER CASE
MATRIX
I
5 x 7
UPPER CASE
MATRIX
I
5 x 7
UPPER CASE
MATRIX
Figure 145. Model 911 VDT Character Matrix Formats
7 x 16
CURSOR
7 x 10
GRAPHIC
MATRIX
The standard character times decoded to begin and end events do not depend on ac input frequency
(50 or 60 hertz) or display size (960 or 1920 characters). They can change with a new control
ROM to permit different synchronization. The standard Model 911 VDT format requires the
following relationship between video data and synchronization signals.
(A)136305
HBSL ENABLED
VIDEO DATA
HDENDL
ENABLED
\~------- ~------'
v
80 CHARACTER \""----v,__ _ _,!
TIMES
20 CHARACTER TIMES
K99L ENABLED
By changing the character times decoded, the standard RS 1 70 format can be generated as
follows:
VIDEO DATA
VIDEO DATA
1 ~11
, ______ __,,
v
(A) 136306 20 CHARACTER TIM ES
1-75
Digital Systems Division

Texas Instruments 990 Specifications

General

Brand	Texas Instruments
Model	990
Category	Desktop
Language	English