United States December 31, 2002
Maintenance & Service Guide
Presario 7800 Series Personal Computers
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Specifications
Specifications
Compaq Presario 7800 Series Personal Computer specifications are listed in the following tables.
Select the specification you are interested in from the navigation bar.
Specifications
System
Specifications
Video Memory
System Interrupts
System I/O
System Memory
System DMA
Power Supply
Diskette Drive
DVD Drive
IDE Hard Drives
Mouse
Fax/Modem
CD-RW Drive
System I/O
Low I/O
Address
High I/O
Address
Function
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
0040
0043
Counter/Timer
0044
004F
0050
0053
Counter/Timer Aliases
0053
005F
0060
Keyboard Controller Data Register
0061
Port B: SERR/IOCHK NMI, Speaker, Refresh
0062
0063
0064
Keyboard Controller Command/Status
Register
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0065
006F
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
0080
008F
DMA Page Registers
0090
0091
Alias of DMA page registers if SOUTH
BRIDGE.4C.7=0
0092
Port 92 (fast reset and A20 gate)
0093
009F
Alias of DMA page registers if SOUTH
BRIDGE.4C.7=0
00A0
Interrupt Controller #2 Control Register
00A1
Interrupt Controller #2 Mask Register
00A2
00B1
00B4
00BF
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
00EA
Ultra I/O Index Register
00EB
Ultra I/O Data Register
00EC
00EF
Modem configuration
00F0
00F1
Coprocessor Busy Clear/Reset
00F2
00F8
00F9
Lock Configuration Register (Dummy Write)
00FA
00FB
Unlock Configuration Register (Dummy Write)
00FD
00FF
0100
0101
0102
Video: POS. 102 register
0103
012F
0132
016F
0170
0177
Secondary IDE Controller
0178
01EF
01F0
01F7
Primary IDE Controller
01F8
0200
0201
0202
021F
0220
022F
0230
025F
0260
0263
0264
0277
0278
027F
Reserved-Parallel Port
0280
02E7
02E8
02EF
Reserved-Serial Port (COM4)
02F0
02F7
02F8
02FF
(COM2)
0330
0331
0332
036F
0370
0377
Reserved-Floppy Drive Controller 2
0378
037F
Parallel Port
0380
0387
0388
038B
038C
03B3
03B4
03B5
Video: Monochrome
03B6
03B9
03BA
Video: Monochrome
03BB
03BC
03BF
Reserved-Parallel Port
03C0
03CF
Video: VGA Registers
03D0
03D3
03D4
03D5
Video: Color
03D6
03D9
03DA
Video: Color
03DB
03E7
03E8
03EF
Reserved-Serial Port (COM3)
03F0
03F7
Floppy Disk Controller (Primary)
03F6
03F7
IDE Interface (Fixed Disk and CD-ROM)
03F8
03FF
Serial Port (COM1)
0400
04EF
04D0
Interrupt Controller #1 Edge/Level Control
04D1
Interrupt Controller #2 Edge/Level Control
04D2
0677
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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