Texas Instruments 990 Installation And Operation Manual page 39

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945423-9701
COMPUTER MEMORY WORD
SELECTA-(CRU PORT. SELECT
FOR VDT 0)
SELECTA-(CRU PORT SELECT
FOR VDT 0)
*
JAPANESE KATAKANA MODEL
ALPHANUMERIC~O
;KATAKANA
MODE~
I
IA) 134321 A
CRT CONTROLLER
CRU BITS
•
•
•
DISPLAY MEMORY WRITE DATA O/TEST MODE SEL.ECT 0
!
1/
2/
2 2
3
4
3/TE5T MODE SEL.ECT 3
4
5 5
6
DISPLAY MEMORY WRITE DATA
6
7
8
HIGH INTENSITY=O; L.OW
INTENSITY~
1
*
WRITE DATA STROBE
9
TEST MODE
A CURSOR MOVE (O=lNCREMENT; 1 =DECREMENT)
B BLINKING CURSOR ENABL.E
C KEYBOARD INTERRUPT ENABLE
o
DUAL INTENSITY (HI/L.O INTENSITY) ENABL.E
E DISPLAY ENABLE
F SELECT WORD
O~O:
SELECT WORD 1 =1
o
CURSOR ADDRESS L.SB
2
3
• 4
•
•
5
6
7
8
9
A CURSOR ADDRESS MSB
B NOT USED
C DISPLAY CURSOR
o
KEYBOARD ACKNOWL.EDGE STROBE
E BEEP ENABL.E STROBE
F SELECT WORD
O~O;
SELECT WORD
1 ~ 1
Figure 3-4. Computer Output Bit Assignments for Terminal 0
3-7
Digital Systems Division