System Board; Component And Connector Locations - Compaq DS20E - AlphaStation - 1 GB RAM Technical Manual

System Board

The interconnect switch is implemented on the system board
by the chipset consisting of one C-chip, two P-chips, and eight
D-chips. This complex chipset provides the data and address
path between the CPUs, memory, and the I/O subsystem.
A flash ROM holds the console code and the NVRAM data.
Switches are located near the CD-ROM connector. One of
these switches must be set when the system is upgraded to
faster processors.
Integrated into the system board are controllers for the floppy
diskette, the CD-ROM, a SCSI tape drive, two serial ports, one
parallel port, and keyboard and mouse.
DIMM Slots
Parallel Port
COM 1
COM 2
Keyboard & Mouse
DIMM Slots
PCI 0 Slot 7
PCI 0 Slot 8
PCI 0 Slot 9
PCI 1 Slot 7
PCI 1 Slot 8
PCI 1 Slot 9
ISA Slot
1
3
1
3
0
2
0
2
C
D D
Chip
Chip Chip
Chip
D D
Chip Chip Chip
2
0
2
0
3
1
3
1

Component and Connector Locations

Connectors are provided for the following:
2 CPU modules
16 DIMM memory modules
6 PCI devices
1 ISA device
1 floppy diskette drive
1 IDE CD-ROM
I/O panel for parallel port, COM1 and COM2 ports, keyboard
and mouse
D D
Chip
D
D
Chip
P P
Chip Chip
PK-0320C-99
CPU 0
CPU 1
SCSI
Speaker
Firmware Flash ROM
Floppy
CD-ROM
Switches
3