Texas Instruments 990 Installation And Operation Manual page 35

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945423-9701
COMPUTER MEMORY WORD
• • •
SELECTB-(CRU PORT SELECT
FOR VDT 1)
SELECTB-(CRU PORT SELECT
FOR VDT 1)
*
JAPANESE KATAKANA MODEL
ALPHANUMERIC MODE=O; KATAKANA MODE= 1
(A)13431 BA
CRT CONTROLLER
CRU BITS
DISPLAY MEMORY READ DATA LSB
I I
12
13
• 14
15
•
16 DISPLAY MEMORY READ DATA MSB
17 HIGH INTENSITYc-O ;LOW INTENSITY- I'"
I B KEYBOARD DATA LSB
19
IA
IB
• IC
•
•
•
10
I E KEYBOARD DATA (Ivl ",d-l )
KEYBOARD DATA READY
CURSOR ADDRESS LSB
11
12
13
14
15
16
17
I B
19
IA CURSOR ADDRESS MSB
1 B KEYBOARD DATA MSB
lC
TERMINAL READY (READY~O;OFFLINE=I)
10 PREVIOUS STATE FLAG OR SELF TEST
IE
KEYBOARD PARITY ERROR
IF
KEYBOARD DATA READY
Figure 3-2. Computer Input Bit Assignments for Terminal 1
3-3
Digital Systems Division