
E-12
PS2 Keyboard Interface (KEYBOARD)
This is a PS2 compatible Keyboard Interface.
Ethernet Interface (LAN)
This interface complies with the IEEE802.3 Ethernet communication standard
(10BASE-T/100BASE-TX Auto Changeover).
Pin Arrangement Pin No.
SPP/EPP Mode
Signal Name
EPP Mode
Signal Name
Direction
Electrical
Specification
1
ST RB WRIT E In/Output
O.D/T.S *
1
2
DAT A0 DAT A0 In/O utput O.D
3
DAT A1 DAT A1 In/O utput O.D
4
DAT A2 DAT A2 In/O utput O.D
5
DAT A3 DAT A3 In/O utput O.D
6
DAT A4 DAT A4 In/O utput O.D
7
DAT A5 DAT A5 In/O utput O.D
8
DAT A6 DAT A6 In/O utput O.D
9
DAT A7 DAT A7 In/O utput O.D
10
ACKNLG ACKNLG Input T T L
11
BUSY WAIT Input TTL
12
PE PE Input TTL
13
SLCT SLCT Input TTL
14
AUTOFD DSTRB In/Output
O.D/T.S *
1
15
ERROR ERROR Input TTL
16
INIT INIT In/Output
O.D/T.S *
1
17
SLCTIN ADSTRB In/Output
O.D/T.S *
1
18
GND GND
--
19
GND GND
--
20
GND GND
--
21
GND GND
--
22
GND GND
--
23
GND GND
--
24
GND GND
--
25
GND GND
--
Printer Interface (LPT1)
This interface conforms to Centronics standards.
Electrical specifications
• O.D : Open Drain
• T.S
: State Input/Output
• TTL : TTL Input
1
14
13
25
*1 Pins 1, 14, 16 and 17 will become O.D when the SPP mode specification is used. If the mode
changes to ECP or EPP, these pins will become T.S.
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