Technical Reference Guide
                                                                  Compaq Deskpro EP Series Personal Computers
First Edition – April 1998
ix
LIST OF FIGURES
F
IGURE 
2–1.   C
OMPAQ 
D
ESKPRO 
EP P
ERSONAL 
C
OMPUTERS WITH 
M
ONITOR
.......................................... 2-1
F
IGURE 
2–2.   C
ABINET 
L
AYOUT
, F
RONT 
V
IEW
....................................................................................... 2-3
F
IGURE 
2–3.   C
ABINET 
L
AYOUT
, R
EAR 
V
IEW
......................................................................................... 2-3
F
IGURE 
2–4.   C
HASSIS 
L
AYOUT
, T
OP 
V
IEW
............................................................................................ 2-4
F
IGURE 
2–5.   S
YSTEM 
B
OARD 
L
AYOUT
, C
OMPONENT 
S
IDE
..................................................................... 2-5
F
IGURE 
2–6.   S
YSTEM 
A
RCHITECTURE
, B
LOCK DIAGRAM
........................................................................ 2-7
F
IGURE 
2–7.   P
ROCESSOR 
A
RCHITECTURAL 
C
OMPARISON 
D
IAGRAM
........................................................ 2-8
F
IGURE 
3–1.   66-MH
Z 
S
LOT 
1 P
ROCESSOR
/M
EMORY 
S
UBSYSTEM 
A
RCHITECTURE
................................... 3-2
F
IGURE 
3–2.   C
ELERON 
P
ROCESSOR 
I
NTERNAL 
A
RCHITECTURE
............................................................... 3-3
F
IGURE 
3–3.
 
P
ENTIUM 
II P
ROCESSOR 
I
NTERNAL 
A
RCHITECTURE
............................................................. 3-3
F
IGURE 
3–4.   S
YSTEM 
M
EMORY 
M
AP
..................................................................................................... 3-7
F
IGURE 
3–5.   100-MH
Z 
S
LOT 
1 P
ROCESSOR
/M
EMORY 
S
UBSYSTEM 
A
RCHITECTURE
................................. 3-9
F
IGURE 
3–6.   350-/400-MH
Z 
P
ENTIUM 
II P
ROCESSOR 
I
NTERNAL 
A
RCHITECTURE
.................................. 3-10
F
IGURE 
4–1.  PCI B
US 
D
EVICES AND 
F
UNCTIONS
..................................................................................... 4-2
F
IGURE 
4–2.   PCI B
US 
C
ONNECTOR 
(32-B
IT 
T
YPE
).................................................................................4-3
F
IGURE 
4–3.   T
YPE 
0 C
ONFIGURATION 
C
YCLE
........................................................................................ 4-6
F
IGURE 
4–4.   PCI C
ONFIGURATION 
S
PACE 
M
AP
...................................................................................... 4-7
F
IGURE 
4–5.   AGP 1X D
ATA 
T
RANSFER 
(P
EAK 
T
RANSFER 
R
ATE
: 266 MB/
S
)........................................ 4-12
F
IGURE 
4–6.   AGP 2X D
ATA 
T
RANSFER 
(P
EAK 
T
RANSFER 
R
ATE
: 532 MB/
S
)........................................ 4-13
F
IGURE 
4–7.   AGP B
US 
C
ONNECTOR
................................................................................................... 4-15
F
IGURE 
4–8. ISA B
US 
B
LOCK 
D
IAGRAM
................................................................................................ 4-16
F
IGURE 
4–9.   ISA E
XPANSION 
C
ONNECTOR
.......................................................................................... 4-17
F
IGURE 
4–10.   M
ASKABLE 
I
NTERRUPT 
P
ROCESSING
, B
LOCK 
D
IAGRAM
.................................................. 4-23
F
IGURE 
4–11.   C
ONFIGURATION 
M
EMORY 
M
AP
.................................................................................... 4-29
F
IGURE 
5–1.   40-P
IN 
IDE C
ONNECTOR
. ................................................................................................. 5-9
F
IGURE 
5–2.   34-P
IN 
D
ISKETTE 
D
RIVE 
C
ONNECTOR
.............................................................................. 5-14
F
IGURE 
5–3.   S
ERIAL 
I
NTERFACE 
C
ONNECTOR 
(M
ALE 
DB-9 
AS VIEWED FROM REAR OF  CHASSIS
)........... 5-15
F
IGURE 
5–4.   P
ARALLEL 
I
NTERFACE 
C
ONNECTOR 
(F
EMALE 
DB-25 
AS VIEWED FROM REAR OF CHASSIS
).. 5-27
F
IGURE 
5–5.   8042-T
O
-K
EYBOARD 
T
RANSMISSION OF 
C
ODE 
ED
H
, T
IMING 
D
IAGRAM
............................ 5-28
F
IGURE 
5–6.   K
EYBOARD OR 
P
OINTING 
D
EVICE 
I
NTERFACE 
C
ONNECTOR
............................................... 5-34
F
IGURE 
5–7.   U
NIVERSAL 
S
ERIAL 
B
US 
C
ONNECTOR 
(
ONE OF TWO AS VIEWED FROM REAR OF CHASSIS
)..... 5-36
F
IGURE 
6–1.   P
OWER 
S
UPPLY 
A
SSEMBLY AND 
A
SSOCIATED 
C
IRCUITRY
, B
LOCK 
D
IAGRAM
....................... 6-1
F
IGURE 
6–2.   P
OWER 
C
ABLE 
D
IAGRAM
.................................................................................................. 6-5
F
IGURE 
6–3.  L
OW 
V
OLTAGE 
R
EGULATOR 
C
IRCUITRY
, B
LOCK 
D
IAGRAM
................................................. 6-6
F
IGURE 
6–4.   G
ENERAL 
S
IGNAL 
D
ISTRIBUTION
, F
UNCTIONAL 
B
LOCK 
D
IAGRAM
....................................... 6-7
F
IGURE 
6–5.   F
RONT 
P
ANEL 
(B
EZEL
) C
ONTROL
/I
NDICATOR 
C
ONNECTOR
................................................ 6-8
F
IGURE 
6–6.   W
AKE
-O
N
-LAN NIC C
ONNECTOR
.................................................................................... 6-8
F
IGURE 
B–1.   ASCII C
HARACTER 
S
ET
...................................................................................................B-1