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Port B Output
OUT
BA
PB
1
-
PBO
LCD Chip Select
7
6
5
4
3
2
1
0
APO
0
1
RTS
-
BELL
0
1
MELODY CONTROL OUTPUT
On
Off
KS8
DCDIRD SELECT O F THE RS-232C
Ring Detect
Data Carrier Detect
PBO
DTFi
AUTO POWER O F F OUTI'UT
Output Off
Output On
BUZZER OUTPUT
Ring
Not Ring
BELL
-
DTR
RS-232C DTR output Active Low
-
RTS
RTS output Active Low
APO
K E
*
Port C Input
p e l
5
4
3
2
1
0
-
DSR
BCR
-
CTS
CDI
BUSY
SLCT
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