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Chapter 4 System Support
Compaq Deskpro EN Series of Personal Computers
Desktop and Minitower Form Factors
Third Edition - September 1998
4-16
4.4 ISA BUS OVERVIEW
NOTE:
This section describes the ISA bus in general and highlights bus
implementation in this particular system. For detailed information regarding ISA bus
operation, refer to the Compaq Extended Industry Standard Architecture (EISA)
Technical Reference Guide.
The industry standard architecture (ISA) bus provides an 8-/16-bit path for standard I/O
peripherals as well as for optional devices that can be installed in the ISA expansion slots. Figure
4-8 shows the key functions and devices that reside on the ISA bus.
Figure 4–8.
ISA
Bus Block Diagram
8-/16-Bit ISA Bus
BIOS
ROM
PCI Bus
PC 87307B I/O Controller
Diskette
I/F
Keyboard/
Mouse I/F
Serial
I/F
(
2
)
Parallel
I/F
ISA Connector 2
ISA Connector 1
66-MHz slot 1 system only
82371 South Bridge
PCI/ISA
Brid
g
e Function