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6–14 Maintenance and Service Guide Specifications Table 6-14 System Interrupts Hardware IRQ System Function IRQ0 System timer IRQ1 Keyboard controller IRQ2 Cascaded IRQ3 COM2 IRQ4 COM1 IRQ5 Audio (default)* IRQ6 Diskette drive IRQ7 Parallel port IRQ8 Real time clock (RTC) IRQ9 Infrared IRQ10 System use IRQ11 System use IRQ12 Internal point stick or external mouse IRQ13 Coprocessor (not available to any peripheral) IRQ14 IDE interface (hard drive and optical drive) IRQ15 System use .PC Cards may assert IRQ3, IRQ4, IRQ5, IRQ7, IRQ9, IRQ10, IRQ11, or IRQ15. Either the infrared or the serial port may assert IRQ3 or IRQ4. *Default configuration; audio possible configurations are IRQ5, IRQ7, IRQ9, IRQ10, or none. Maintenance and Service Guide 6–15 Specifications Table 6-15 System I/O Addresses I/O Address (hex) System Function (shipping configuration) 000 - 00F DMA controller no. 1 010 - 01F Unused 020 - 021 Interrupt controller no. 1 022 - 024 Opti chipset configuration registers 025 - 03F Unused 02E - 02F 87334 “Super I/O” configuration for CPU 040 - 05F Counter/timer registers 044 - 05F Unused 060 Keyboard controller 061 Port B 062 - 063 Unused 064 Keyboard controller 065 - 06F Unused 070 - 071 NMI enable/real time clock 072 - 07F Unused 080 - 08F DMA page registers 090 - 091 Unused 092 Port A 093 - 09F Unused 0A0 - 0A1 Interrupt controller no. 2 6–16 Maintenance and Service Guide Specifications Table 6-15 System I/O Addresses (Continued) I/O Address (hex) System Function (shipping configuration) 0A2 - 0BF Unused 0C0 - 0DF DMA controller no. 2 0E0 - 0EF Unused 0F0 - 0F1 Coprocessor busy clear/reset 0F2 - 0FF Unused 100 - 16F Unused 170 - 177 Secondary fixed disk controller 178 - 1EF Unused 1F0 - 1F7 Primary fixed disk controller 1F8 - 200 Unused Joystick (decoded in ESS1688) 202 - 21F Unused 220 - 22F Entertainment audio 230 - 26D Unused 26E - 26 Unused 278 - 27F Unused 280 - 2AB Unused 2A0 - 2A7 Unused 2A8 - 2E7 Unused 2E8 - 2EF Reserved serial port Maintenance and Service Guide 6–17 Specifications Table 6-15 System I/O Addresses (Continued) I/O Address (hex) System Function (shipping configuration) 2F0 - 2F7 Unused 2F8 - 2FF Infrared port 300 - 31F Unused 320 - 36F Unused 370 - 377 Secondary diskette drive controller 378 - 37F Parallel port (LPT1/default) 380 - 387 Unused 388 - 38B FM synthesizer—OPL3 38C - 3AF Unused 3B0 - 3BB VGA 3BC - 3BF Reserved (parallel port/no EPP support) 3C0 - 3DF VGA 3E0 - 3E1 PC Card controller in CPU 3E2 - 3E3 Unused 3E8 - 3EF Internal modem 3F0 - 3F7 “A” diskette controller 3F8 - 3FF Serial port (COM1/default) CF8 - CFB PCI configuration index register (PCIDIVO-1) CFC - CFF PCI configuration data register (PCIDIVO-1) 6–18 Maintenance and Service Guide Specifications Table 6-16 System Memory Map Size Memory Address System Function 640 KB 00000000-0009FFFF Base memory 128 KB 000A0000-000BFFFF Video memory 48 KB 000C0000-000CBFFF Video BIOS 160 KB 000C8000-000E7FFF Unused 64 KB 000E8000-000FFFFF System BIOS 15 MB 00100000-00FFFFFF Extended memory 58 MB 01000000-047FFFFF Super extended memory 58 MB 04800000-07FFFFFF Unused 2 MB 08000000-080FFFFF Video memory (direct access) 4 GB 08200000-FFFEFFFF Unused 64 KB FFFF0000-FFFFFFFF System BIOS Maintenance and Service Guide 6–19 A Connector Pin Assignments Table A-1 RJ-45 Network Interface Pin Signal Pin Signal 1 Transmit + 5 Unused 2 Transmit 6 Receive 3 Receive + 7 Unused 4 Unused 8 Unused Maintenance and Service Guide A–1 Connector Pin Assignments Table A-2 RJ-11 Modem Pin Signal Pin Signal 1 U n u s e d 4 U n u s e d 2 T ip 5 U n u sed 3 R i n g 6 U n u s e d Table A-3 Universal Serial Bus Pin Signal Pin Signal 1 + 5 VDC 3 Data + 2 D ata 4 Ground A–2 Maintenance and Service Guide Connector Pin Assignments Table A-4 S-Video Pin Signal Pin Signal 1 Ground (Y) 3 Y-Luminance (Intensity) 2 Ground (C) 4 C-Chrominance (Color) Maintenance and Service Guide A–3 Connector Pin Assignments Table A-5 Parallel Pin Signal Pin Signal 1 Strobe* 10 Acknowledge* 2 Data bit 0 11 Busy 3 Data bit 1 12 Paper out 4 Data bit 2 13 Select 5 Data bit 3 14 Auto line feed* 6 Data bit 4 15 Error* 7 Data bit 5 16 Initialize printer* 8 Data bit 6 17 Select in* 9 Data bit 7 18-25 Signal ground *Signal is active low. A–4 Maintenance and Service Guide Connector Pin Assignments Table A-6 External Monitor Pin Signal Pin Signal 1 Red analog 9 +5 VDC 2 Green analog 10 Ground 3 Blue analog 11 Monitor detect 4 Not connected 12 DDC 2B data 5 Ground 13 Horizontal sync 6 Ground analog 14 Vertical sync 7 Ground analog 15 DDC 2B clock 8 Ground analog Maintenance and Service Guide A–5 Connector Pin Assignments Table A-7 Stereo Speaker/Headphone Pin Signal Pin Signal 1 Audio out 2 Ground Table A-8 Microphone Pin Signal Pin Signal 1 Audio in 2 Ground A–6 Maintenance and Service Guide B Power Cord Set Requirements 3-Conductor Power Cord Set The computer’s wide range input feature permits it to operate from any line voltage from 100 to 120 or 220 to 240 volts AC. The power cord set re...
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