Hardware Configuration Features B-7Figure B-4. Pin Numbers for the Parallel PortConnectorKeyboard and Mouse ConnectorsYour system uses a Personal System/2 (PS/2)-style key-board and supports a PS/2-compatible mouse. Cablesfrom both devices attach to 6-pin miniature DeutscheIndustrie Norm (DIN) connectors on the back panel of yourcomputer.A PS/2-compatible mouse works identically to anindustry-standard serial mouse or bus mouse except thatit has its own dedicated connector, which frees up bothserial ports and does not require an expansion card. Cir-cuitry inside the mouse detects the movement of a smallball and relays the direction to the computer.Mouse driver software can give the mouse priority withthe microprocessor by issuing IRQ12 whenever a newmouse movement is made. The driver software alsopasses along the mouse data to the application programthat is in control.Keyboard ConnectorIf you reconfigure your hardware, you may need pinnumber and signal information for the keyboard connec-tor. Figure B-5 illustrates the pin numbers for thekeyboard connector, and Table B-5 lists and defines thepin assignments and interface signals for the keyboardconnector.Figure B-5. Pin Numbers for the KeyboardConnectorTable B-4. Pin Assignments for the Parallel PortConnectorPin Signal I/O Definition1 STB# I/O Strobe2 PD0 I/O Printer data bit 03 PD1 I/O Printer data bit 14 PD2 I/O Printer data bit 25 PD3 I/O Printer data bit 36 PD4 I/O Printer data bit 47 PD5 I/O Printer data bit 58 PD6 I/O Printer data bit 69 PD7 I/O Printer data bit 710 ACK# I Acknowledge11 BUSY I Busy12 PE I Paper end13 SLCT I Select14 AFD# O Automatic feed15 ERR# I Error16 INIT# O Initialize printer17 SLIN# O Select in18–25 GND N/A Signal ground25 1413 1135246shell
