HP Pavilion Tx2500 Entertainment Notebook Pc Series Service Guide

System I/O address specifications
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/RTC
072 - 07F Unused
080 - 08F DMA page registers...

I/O address (hex) System function (shipping configuration)
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
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)...

System memory map specifications
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 04800000-07FFFFFF 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
System memory map...

7 Screw listing
This section provides specification and reference information for the screws and screw locks used in
the computer. All screws and screw locks listed in this section are available in the Screw Kit, spare
part number 464116-001.
Phillips PM3.0×3.0 screw
Color Quantity Length Thread Head width
Silver 4 3.0 mm 3.0 mm 5.0 mm
Where used: 4 screws that secure the hard drive bracket to the hard drive
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Phillips PM2.0×7.0 screw
Color Quantity Length Thread Head width
Black 9 7.0 mm 2.0 mm 4.5 mm
Where used: 4 screws that secure the switch cover to the computer
Where used: 5 screws that secure top cover to the computer
Phillips PM2.0×7.0 screw 87 

Phillips PM2.0×4.0 screw
Color Quantity Length Thread Head width
Silver 10 4.0 mm 2.0 mm 4.5 mm
Where used: 2 screws that secure the top cover to the computer
Where used: 2 screws that secure the power switch board to the base enclosure
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Where used: 2 screws that secure the audio/infrared board to the base enclosure
Where used: 4 screws that secure the fan/heat sink assembly to the system board
Phillips PM2.0×4.0 screw 89 

Phillips PM2.0×5.0 captive screw
Color Quantity Length Thread Head width
Black 6 5.0 mm 2.0 mm 4.5 mm
Where used:
(1) Two captive screws (secured by C-clips) that secure the hard drive cover to the computer
(2) Two captive screws (secured by C-clips) that secure the memory module compartment cover to
the computer
(3) One captive screw (secured by a C-clip) that secures the WLAN module compartment cover to the
computer
(4) One captive screw (secured by a C-clip) that secures the display cable cover to the...

Black Phillips PM2.0×3.0 screw
Color Quantity Length Thread Head width
Black 5 3.0 mm 2.0 mm 4.5 mm
Where used: 2 screws that secure the WLAN module to the computer
Where used: 3 screws that secure the top cover to the base enclosure
Black Phillips PM2.0×3.0 screw 91 

Phillips PM2.0×11.0 screw
Color Quantity Length Thread Head width
Black 4 11.0 mm 2.0 mm 4.5 mm
Where used: 4 screws that secure the keyboard to the computer
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