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Maintenance and Service Guide
Compaq Presario 7500 Series Computers

MSG index Product Description Troubleshooting Illustrated Parts Catalog
Home Removal & Replacement Jumper & Switch Information Specifications

Power supply
Diskette drive
Hard drives
DVD drive
CD drives
Mouse
Fax/modem
Zip drive
System
SPECIFICATIONS

System Specifications (continued)

General system specifications

Video memory

System interrupts

System I-O

System memory

System DMA

 

System I/O

Low and High I/O Addresses  (Hex)

System Function (Shipping Configuration)

0000 - 000F DMA Controller # 1
0010 - 001F DMA controller aliases
0020 Interrupt Controller # 1 Control Register
0021 Interrupt Controller #1 Mask Register
0022 - 003D Interrupt Controller Aliases
040 - 0043 Counter/Timer
0044 - 004F Unused
0050-0053 Counter/Timer Aliases
0053-005F Unused
0060 Keyboard Controller Data Register
0061 Port B: SERR/IOCHK NMI, Speaker, Refresh
0062 - 0063 Unused
0064 Keyboard Controller Command/Status Register
0065 - 006F Unused
0070 NMI mask register (bit 7)
0070 RTC/Configuration Memory Index Port (bit 6:0)
0071 RTC/Configuration Memory Data Port
0072 RTC Extended Index
0073 RTC Extended Data
0074-007F Unused
0080 - 008F DMA Page Registers
0090 - 0091 Unused (alias of DMA page registers if PIIX4.4C.7=0)
0092 Port 92 (fast reset and A20 gate)
0093 - 009F Unused (alias of DMA page registers if PIIX4.4C.7=0)
00A0 Interrupt Controller # 2 Control Register
00A1 Interrupt Controller # 2 Mask Register
00A2 - 00B1 Unused
00B2 APM Control
00B3 APM Status
00B4-00BF Unused
00C0 - 00DF DMA Controller # 2
00E0 ESS Index Register
00E1 ESS Data Register
00E2 - 00E3 DDC2 Registers
00E4 - 00E5 Master I2C Interface
00E6 TV/MPEG Configuration Register
00E7 - 00E9 Unused
00EA Ultra I/O Index Register
00EB Ultra I/O Data Register
00EC- 00EF Modem Configuration
00F0 - 00F1 Coprocessor Busy Clear/Reset
00F2 - 00F8 Unused
00F9 Lock Configuration Register (Dummy Write)
00FA Unused
00FB Unlock Configuration Register (Dummy Write)
00FC TV/MPEG Configuration Register to remap base I/O address and interrupt resource
00FD-00FF Unused
0100 - 0101 Unused
0102 Video: POS. 102 Register
0103-012F Unused
0130-0131 BGl Index/Data for second line modem See 260 for controllerless modems.
0132 - 016F Unused
0170 - 0177 Secondary IDE Controller (CD Drive)
0178 - 01EF Unused
01F0 - 01F7 Primary IDE Controller (Hard Drive)
01F8 - 0200 Unused
0201 Joystick Port
0202 - 021F Unused
0220 - 022F Audio Controller
0230 - 025F Unused
0260 - 0263 Reserved - Modem use during POST
0264 - 0277 Unused
0278 - 027F Reserved - Parallel Port (LPT 2)
0280 - 02E7 Unused
02E8 - 02EF Reserved - Serial Port (COM 4)
02F0 - 02F7 Unused
02F8 - 02FF Fax/Modem (COM 2)
0330 - 0331 MPU-401
0332 - 036F Unused
0370 - 0377 Reserved - Diskette Drive Controller 2
0378 - 037F Parallel Port
0380 - 0387 Unused
0388 - 038B Audio FM Synthesizer
038C - 03B3 Unused
03B4 - 03B5 Video: Monochrome
03B6 - 03B9 Unused
03BA Video: Monochrome
03BB Unused
03BC -03BF Reserved - Parallel Port
03C0 -03CF Video: VGA Registers
03D0 - 03D3 Unused
03D4 - 03D5 Video: Color
03D6 - 03D9 Unused
03DA Video: Color
03DB - 03E7 Unused
03E8 - 03EF Reserved - Serial Port (COM 3)
03F0 - 03F7 Diskette Controller (Primary)
03F6 - 03F7 IDE Interface (Fixed disk and CD or DVD Drive)
03F8 - 03FF Serial Port (COM 1)
0400 - 04EF Unused
04D0 Interrupt Controller #1 Edge/Level Control
04D1 Interrupt Controller #2 Edge/Level Control
04D2 - 0677 Unused
0678 - 067A Parallel Port ECP Mode
0778 - 077A Parallel Port ECP Mode
0CF8 PCI Configuration Index (32-bit I/O only)
0CFC PCI Configuration Data
46E8

Video: Adapter Sleep

 

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