5-8 CHAPTER 4
APPENDIX B: I/O CONNECTORS
COM1,COM2 : Serial Ports Connector
LPT1 : Parallel Port Connector
Signal Name Pin Pin Signal Name
Signal Name Pin Pin Signal Name
DCD
SIN
SOUT
DTR
GND
1 6 DSR
2 7 RTS
3 8 CTS
4 9 RI
5
STROBE-
Data Bit 0
Data Bit 1
Data Bit 2
Data Bit 3
Data Bit 4
Data Bit 5
Data Bit 6
Data Bit 7
ACJ-
BUSY
PE
SLCT
1 14 AUTO FEED-
2 15 ERROR-
3 16 INIT-
4 17 SLCT IN-
5 18 Ground
6 19 Ground
7 20 Ground
8 21 Ground
9 22 Ground
10 23 Ground
11 24 Ground
12 25 Ground
13
Figure 5-1:
P55KTX I/O back panel Layout
COM1
PS/2
Keyboard
PS/2
Mouse
parallel port
COM2
