Chapter 3 Processor/Memory Subsystem
3-2 Compaq Deskpro EP Series of Personal Computers
First Edition - April 1998
64-Bit 66-MHz
Mem. Data Bus
Mem. Addr.
3.2 66-MHz SLOT 1 PROCESSOR/MEMORY SUBSYSTEM
Systems using the 66-MHz slot 1 (2-DIMM) system board feature the Intel Celeron or Pentium II
processor and employ the 82443EX system controller and 16 or 32 megabytes of system memory
expandable to 256 megabytes.
Figure 3–1.
66-MHz Slot 1
Processor/Memory Subsystem Architecture
The processor is mounted in a slot 1-type connector that facilitates easy changing/upgrading.
Replacing the processor may require reconfiguring DIP switch SW1 to select the correct bus
frequency/core frequency combination. Frequency selection is described in detail later in this
section.
The 443EX system controller provides the Host/PCI bridge functions and controls data transfers
with system memory over the 64-bit memory data bus. An economic version of its predecessor
the 443LX, the 443EX supports only two SDRAM, EDO, or FPM DIMMs. The system memory
can be expanded to 256 megabytes.
Processor
(in Slot 1)
32-Bit 33-MHz PCI Bus
Optional module
32-MB
DIMM
J1
J2
System Memory
66-MHz
64-Bit Host Bus
Host/PCI
Controller
(82443EX)
Cntl
DIMM
66-MHz
32-Bit
Graphics
Card
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