User`s guide

26
Chapter 2 - The Mainboard
Mainboard Diagram
Level 2 SIMM
Socket (System
Cache)
16 bit ISA
Expansion
Slots
BIOS
Chip
PCI
Configuration
Header
J6
CPU
Clock
Jumper
CLK1
PS2 Secondary
Power Supply
Connector
Main
Power
Supply
Connectors
PS1
32-bit PCI
Expansion
Slots
16 bit ISA
Expansion
Slots
System
Battery
Floppy
Header
J5
Primary
IDE Hard
Drive
Header
J7
Secondary
IDE Hard
Drive
Header
J8
SIMM
Sockets for
System
RAM
10Base2
Adapter
Header
J9
SCSI
Device
Header
J11
10BaseT
Adapter
Header
J10
10BaseT
Filter
Chip
Socket
FD1
Primary
CPU
U26
Secondary
CPU
(future)
U21
Power-On LED &
Keyboard Lock
J13
Microphone
Input Jack
AJ2
PC Speaker
Header
AJ1
Audio Port
Header
AP4
CACHE1
Jumper
LAN/SCSI
Chip
Socket
(optional)
U27
9-pin Serial
Port COMA
J2
Keyboard
Connector
J1
25-pin
Serial Port
COMB
J3
Parallel
Port
J4
Mute LED, Mute
Input (not used) &
Reset Input (J15)
HDD LED & PC
Speaker Header
J14
slot 4
slot 3
slot 5
slot 2 slot 1 slot 6
slot 7 slot 8
Speaker
Output Jack
AJ3
LAN/SCSI
Chip Clock
Oscillator Y3