Maintenance & Service Guide
Compaq Deskpro EX Series
of Personal Computers
Microtower Models
D o c u m e n t a t i o n (not shown)
2000 Compaq Computer Corporation. COMPAQ and the Compaq
logo Registered U.S. Patent and Trademark Office.
M a i n t e n a n c e & Service Guide 216921-001
Microsoft, MS-DOS, Windows and other names of Microsoft
products referenced herein are trademarks or registered S e r v i c e Reference Guide 152611-001
trademarks of Microsoft Corporation.
C o m p a q Quick Troubleshooting Guide 153837-001
Intel and Pentium are registered trademarks of Intel Corporation.
MMX and Celeron are trademarks of Intel Corporation.
Product names mentioned herein may be trademarks and/or
registered trademarks of their respective companies.
First Edition. September 2000.
K e y b o a r d s (not shown)
Keyboard 216919-xx1
U n i t e d States -00x
F r e n c h Canadian -12x
J a p a n e s e (Kanji) -29x
L a t i n American Spanish -16x
S p a n i s h (LA MERCO) -C9x
P R C Chinese -AAx
Part Number: 216616-001 Taiwanese -ABx
H K Chinese -ACx
Spare Part Number: 216921-001
3
5
13
15
14
2
6
4
7
17
16
8
1
11
9 12
10
S y s t e m Unit Cables Miscellaneous Parts
1 L e f t access panel with 2 screws N o t spared 9 C D - R O M drive cable/Hard drive cable 216914-001 16 R T C Battery 153099-001
2 C h a s s i s assembly (reference only) N o t spared * Mouse 216920-001
10 D i s k e t t e drive cable 216916-001
3 R i g h t access panel with 2 screws N o t spared 11 P o w e r button and LED cable 216917-001 17 B e z e l blanks (2) 216913-001
4 F r o n t bezel N o t spared 12 C D audio cable N o t spared * Not shown
5 P o w e r supply 216912-001
M i s c e l l a n e o u s Screw Kit (not shown)
S t a n d a r d and Optional Boards
M a s s Storage Devices S c r e w Kit, including: 216918-001
13 S y s t e m board 216906-001
6 1 0 - G B hard drive with 4 screws 203139-001 4 US screws for drive retention
* P r o c e s s o r , Intel Celeron, 566/66 with heatsink 203967-001
7 4 8 X CD-ROM drive with 4 screws 187263-001 4 Metric screws for drive retention
14 P r o c e s s o r , Intel Pentium III, 667/133 with heatsink 1 9 2 0 0 7 - 0 0 1
8 D i s k e t t e drive with 4 screws 222604-001 2 access panel screws
15 M e m o r y module, 64MB/133MHz 170080-001
S y s t e m Memory Map
A d d r e s s Range M e m o r y Address Size Description
1024K524288K 1000001FFFFFFF 511MB E x t e n d e d memory
960K1024K F0000-FFFFF 64KB R u n t i m e BIOS
896K960K E0000-EFFFF 64KB Reserved
800K896K C8000-DFFFF 96KB A v a i l a b l e high DOS memory (open to PCI bus)
640K-800K A0000-C7FFF 160KB V i d e o memory and BIOS
639K-640K 9FC00-9FBFF 1KB E x t e n d e d BIOS data (movable by memory
m a n a g e r software)
512K-639K 80000-9FBFF 127KB E x t e n d e d conventional memory
0K-512K 00000-7FFFF 512KB C o n v e n t i o n a l memory
DMA
Hardware
DMA D a t a Width S y s t e m Function
0 8 - or 16-bits Audio
1 8 - or 16-bits A u d i o / P a r a l l e l port
2 8 - or 16-bits D i s k e t t e drive
3 8 - or 16-bits P a r a l l e l port (for ECP or EPP)/audio
4 D M A controller
5 16-bits Open
6 16-bits Open
7 16-bits Open
C o n n e c t o r s and Jumpers I / O Map
J30 S e c o n d a r y IDE connector
BAT1 E x t e r n a l battery A d d r e s s (hex) Size Description
J32 F r o n t panel/Misc header
DIMM1-2 M e m o r y slots 0000-000F 1 6 bytes D M A controller
J34 P r i m a r y IDE connector
J9 C D audio
0020-0021 2 bytes P r o g r a m m a b l e Interrupt Control (PIC)
JP1 F r o n t panel USB (pins 2&3
J10 A u x - i n connector j u m p e r e d = default shipping 0040-0043 4 bytes S y s t e m timer
configuration)
J11 T e l e p h o n y connector
0060 1 byte K e y b o a r d controller byte-reset IRQ
JP2 B a c k panel USB (pins 2&3
J12 A u d i o / M o d e m Riser (AMR) slot
j u m p e r e d = default shipping 0061 1 byte S y s t e m speaker
J13-15 P C I Expansion Slots configuration)
0064 1 byte K e y b o a r d controller, CMD/STAT byte
J17 C P U fan connector JP3* F W H lock (boot block)
J18 W a k e on Lan (WOL) 0071-0071 2 bytes S y s t e m CMOS/Real Time Clock
JP4* C P U safe speed
J19 P r o c e s s o r socket 0072-0073 2 bytes S y s t e m CMOS
JP5 C l e a r password/CMOS jumper
J23 A T X power connector
0080-008F 1 6 bytes D M A controller
* JP3 and JP4 settings should never be altered.
J26 F l o p p y drive connector
0092 1 byte F a s t A20 and PIC
00A0-00A1 2 bytes PIC
00B2-00B3 2 bytes A P M control
00C0-00D0 3 2 bytes DMA
00F0 1 byte N u m e r i c data processor
Clearing CMOS and Passwords
0170-0177 8 bytes S e c o n d a r y IDE channel
P a s s w o r d s may need to be changed, or the computer's configuration (CMOS) may occasionally be
01F0-01F7 8 bytes P r i m a r y IDE channel
c o r r u p t e d . Both can be cleared using jumper JP5.
O n e of these ranges: C a n very from A u d i o / g a m e port
1 . T u r n off the computer and any external devices, then disconnect the power cord from the
0200-0207 1 byte to 8 bytes
p o w e r outlet.
0208-020F
2 . R e m o v e the access panel on the left side of the computer.
0210-0217
3 . L o c a t e the header labeled JP5. Place a jumper across pins 1 & 2 on JP5. 0218-021F
4 . C o n n e c t the power cord to the power outlet.
O n e of these ranges: A u d i o (SoundBlaster Pro+ compatible)
5 . T u r n on the computer.
0220-022F 1 6 bytes
6 . T h e password reset screen automatically displays. Choose either : 0240-024F 1 6 bytes
F 1 to reset CMOS
F 4 to reset passwords 0228-022F* 8 bytes LPT3
T h e computer executes the choice and automatically shuts down.
0278-027F* 8 bytes LPT2
7 . D i s c o n n e c t the power cord from the power outlet.
02E8-02EF* 8 bytes C O M 4 / v i d e o (8514A)
8 . R e m o v e the jumper from JP5 pins 1 & 2 and place it on pins 2 & 3 (safe position).
9 . R e p l a c e the access panel.
02F8-02FF* 8 bytes COM2
1 0 . R e c o n n e c t the power cord to the power outlet and turn the computer on.
I f F1 was selected in step 6, the CMOS defaults are reset when the computer starts. O n e of these ranges: 8 bytes MPU-401(MIDI)
I f F4 was selected, all passwords are cleared when the computer starts. 0320-0327
0330-0337
N O T E : Clearing CMOS clears the Power-On Password. It does NOT clear the Supervisor Password.
0340-0347
0350-0357
0376 1 byte S e c o n d a r y IDE Channel command port
0 3 7 7 , bit 6:0 7 bits S e c o n d a r y IDE Channel status port
S e t t i n g the Supervisor and Power-On Passwords
0378-037F 8 bytes LPT1
A . S e t t i n g the Supervisor Password provides access protection for the Computer Setup utility.
0388-038B 6 bytes A d L i b + ( F M synthesizer)
1 . T u r n on the computer, then hold down the DEL key until the Computer Setup utility begins.
03B0-03BB 1 2 bytes I n t e l 82810e-DC100 Graphics/Memory Controller Hub (GMCHE)
2 . S e l e c t "Change Supervisor Password" and follow screen instructions.
3 . T h e password will be enabled after saving settings and exiting the utility. 03C0-03DF 3 2 bytes I n t e l 82810e Graphics/Memory Controller Hub (GMCHE)
B . S e t t i n g a Power-On Password.
03E8-03EF 8 bytes COM3
N O T E : A Supervisor Password must have previously been set. That same password will be used for
03F0-03F5 6 bytes D i s k e t t e channel 1
t h e Power-On Password.
1. T u r n on the computer, then hold down the DEL key until the Computer Setup utility begins. 03F6 1 byte P r i m a r y IDE channel command port
2. S e l e c t Advanced CMOS SetupPassword Check.
03F8-03FF 8 bytes COM1
3. S e l e c t "Always" from the Available Options list.
4. T h e password will be enabled after saving settings and exiting the utility. 04D0-04D1 2 bytes E d g e / l e v e l triggered PIC
N O T E : C l e a r i n g passwords clears both the Supervisor and Power-On Passwords, but does not clear
O n e of these ranges: 8 bytes W i n d o w s Sound System
t h e "Always" option. To reset only the Supervisor Password, change "Always" to "Setup" on
0530-0537
t h e Available Options list.
0E80-0E87
0F40-0F47
N O T E : C l e a r i n g CMOS clears the Power-On Password. It does NOT clear the Supervisor Password.
LPTn+400h 8 bytes E C P port, LPTn base address+400h
0CF8-0CFB** 4 bytes P C I configuration address register
0CF9*** 1 byte T u r b o and reset control register
0CFC-0CFF 4 bytes P C I configuration data register
S y s t e m Interrupts (IRQ)
FFA0-FFA7 8 bytes P r i m a r y bus master IDE registers
IRQ S y s t e m Resource
IRQ S y s t e m Resource
FFA8-FFAF 8 bytes S e c o n d a r y bus master IDE registers
8 R e a l - t i m e clock
NM1 I / O channel check
S i z e and address Description
9 U s e r available
0 R e s e r v e d , interval timer
9 6 contiguous bytes starting on a 128-byte divisible boundary I C H (ACPI+TCO)
10 U s e r available
1 R e s e r v e d , keyboard buffer full
6 4 contiguous bytes starting on a 64-byte divisible boundary M o t h e r b o a r d resource
11 U s e r available
2 R e s e r v e d , cascade interrupt from
6 4 contiguous bytes starting on a 64-byte divisible boundary O n b o a r d audio controller
s l a v e PIC
12 O n b o a r d mouse port
3 2 contiguous bytes starting on a 32-byte divisible boundary I C H (USB)
( i f present, else user available)
3 COM2*
( u s e r available if COM2 is not present) 1 6 contiguous bytes starting on a 16-byte divisible boundary I C H (SMB)
13 R e s e r v e d , math coprocessor
4 COM1* 4 0 9 6 contiguous bytes starting on a 4096-byte divisible boundary I n t e l 82810AA PCI bridge
14 P r i m a r y IDE
( i f present, else user available)
5 L P T 2 (Plug and Play option)/audio/user 3 2 contiguous bytes starting on a 32-byte divisible boundary I n t e l 82559 LAN controller
available
15 S e c o n d a r y IDE * Default, but can be changed to another address range.
( i f present, else user available)
6 D i s k e t t e drive controller
* * Dword access only
7 LPT1* * * * Byte access only
N O T E : Some additional I/O addresses are not available due to ICH addresses aliassing.
* Default, but can be changed to another IRQ.
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170080-001
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