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Table A-3. CN4 Pin Assignments (Continued)
Pin No. Signal Name I/O Description
21
RD
O
Read strobe signal
22
WR
O
Write strobe signal
23
IREQ
O
Interrupt to option
24
NMI
O
Non-maskable interrupt
25
DREQ
O
Data request
26
DTCT
I
LT option used/unused
27
VCC
+5 VDC
28
VCC
+5 VDC
29
VCC
+5 VDC
30
VCC
+5 VDC
31
TXD+
Not used
32
TXD-
Not used
33
RXD+
Not used
34
RXD-
Not used
35
DTR
Not used
36
CTS
Not used
37
NC
Not used
38
NC
Not used
39
LCD
Not used
40
SWRD
Not used
41
GND
Ground
42
GND
Ground
43
GND
Ground
44
GND
Ground
45
RESET
O
Reset signal
46
INH
O
I/F disabled
47
CMREQ
I
Request command
48
WRRDY
I
I/F ready
49
RDREQ
I
Data read request
50
WRT
O
Write enable
51
RDT
O
Read enable
52
TYPB
I
Type-B I/F used/unused
53
TXD
Not used
54
READY
Not used
55
RXD
Not used
56
NC
Not connected
57
VCC
+5 VDC
58
VCC
+5 VDC
59
VCC
+5 VDC
60
VCC
+5 VDC
Appendix EPL-5500 Service Manual
A-6 Rev. A