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I/O Ports and ConnectorsB-5
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The system uses a Personal System/2 (PS/2)-style keyboard and supports a PS/2-
compatible mouse. Cables from both devices attach to 6-pin, miniature
Deutsche
Industrie Norm
(DIN) connectors on the back panel of your system. The keyboard con-
nector is on the bottom; the mouse connector is on the top.
A PS/2-compatible mouse works identically to an industry-standard serial mouse or
bus mouse except that it has its own dedicated connector, which frees up both serial
ports and does not require an expansion card. Circuitry inside the mouse detects the
movement of a small ball and relays the direction to the system.
Mouse driver software can give the mouse priority with the microprocessor by issu-
ing IRQ12 whenever new mouse movement is detected. The driver software also
passes along the mouse data to the application that is in control.
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1 STB# I/O Strobe
2 PD0 I/O Printer data bit 0
3 PD1 I/O Printer data bit 1
4 PD2 I/O Printer data bit 2
5 PD3 I/O Printer data bit 3
6 PD4 I/O Printer data bit 4
7 PD5 I/O Printer data bit 5
8 PD6 I/O Printer data bit 6
9 PD7 I/O Printer data bit 7
10 ACK# I Acknowledge
11 BUSY I Busy
12 PE I Paper end
13 SLCT I Select
14 AFD# O Automatic feed
15 ERR# I Error
16 INIT# O Initialize printer
17 SLIN# O Select in
1825 GND N/A Signal ground
3502Ebk0.book Page 5 Friday, November 13, 1998 10:00 AM