Service Manual
Appendix
Table A-7.
Pin Assignments
Pin No.
Signal Name
Description
1
—
Ground
2
I
Printer ready
3
TOP
I
Paper top
4
STA
I
Engine status
CBSY
o
Controller command
6
NC
—
Not connected
7
o
Video signal
8
CCLK
o
Command clock
9
PRFD
o
Pre feed signal
10
NC
—
Not connected
11
I
Horizontal synchronized signal
12
RDY
I
Ensign ready
13
SBSY
I
Status busy
14
NC
—
Not connected
15
START
o
Print start signal
16
o
Controller ready
17
CMD
o
Command
18
—
Ground
19
—
Ground
20
—
Ground
Table A-8.
Pin Assignments
Pin No.
Signal Name
I/o
Description
1
LCDCLK
o
System clock
2
o
LCD data read
3
I
Switch interrupt
,
4
—
Ground
5
LCDX
o
Select of LCD
6
Al
I
Address bit 1
7
LEDX
o
LED data
8
SWRDX
o
Switch data read
9
NC
—
Not connected
10
LCDWRX
o
LCD data write
11
DBO
Data bus bit O
12
DB7
Data bus bit 7
13
DB6
1/0
Data bus bit 6
14
DB5
Data bus bit 5
15
DB4
Data bus bit 4
16
DB3
Data bus bit 3
17
DB2
Data bus bit 2
18
Data bus bit 1
19
+5
—
+5
20
+5
—
+5
Table A-9.
Pin Assignments
Pin No.
Signal Name
Description
1
+5
+5
2
+5
+5
3
—
Ground
4
—
Ground
Rev.
A-n
