Texas Instruments 990 - Page 40

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~ 945423-9701
COMPUTER MEMORY WORD
• •
SELECTB-(CRU PORT SELECT
FOR VDT 1)
•
CRT CONTROLLER
CRU BITS
''-------'"''10
11
DISPLAY MEMORY WRITE DATA O/TEST MODE SELECT 0
•
•
1/
!
2
2/
12
13
14
3/TEST MODE SELECT 3
4
15 5
16 DISPLAY MEMORY WRITE DATA 6
17 H;GH INTENSITY=O ;LOW INTENSITY=I*
18 WRITE DATA STROBE
19 TEST MODE
1 A CURSOR MOVE (OF INCREM ENT; 1 cDECREM ENT)
1 B BLINKING CURSOR ENABLE
• 1 C KEYBOARD INTERRUPT ENABLE
10 DUAL INTENSITY (HI/LO INTENSITY; ENABLE
1 E DISPLAY ENABLE
I'---------------------+--~ 1 F SELECT WORD 0 =0; SELECT WORD 1·,1
SELECTB-(CRU PORT SELECT
FOR VDT 1)
L----t~ 10 CURSOR ADDRESS LSB
•
•
11
12
13
14
IS
16
17
18
19
1 A CURSOR ADDRESS MSB
1 B NOT USED
• 1 C DISPLAY CURSOR
10 KEYBOARD ACKNOWLEDGE STROBE
1 E BEEP ENABLE STROBE
'--------------------------+ilF SELECT WORD 0=0; SELECT WORD 1=1
* JAPANESE KATAKANA MODEL
ALPHANUMERIC MODE=O; KATAKANA MODE=1
(A) 134320A
Figure 3-5. Computer Output Bit Assignments for Terminal 1
3-8
Digital Systems Division