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Technical Reference Guide
4.3
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 an optional device that can be installed in the ISA expansion slot (if
present). Figure 4-5 shows the key functions and devices that reside on the ISA bus.
PCI Bus
PCI/ISA
Bridge Function
ISA Connector [1]
8-/16-Bit ISA Bus
PC 87307 I/O Controller
Keyboard/
Mouse I/F
Diskette
I/F
Serial
I/F (2)
Parallel
I/F
IrDA
I/F
NOTE:
[1] Deskpro 4000S only
Figure 4–5. ISA Bus Block Diagram
Compaq Deskpro 4000N and 4000S Personal Computers
First Edition - September1997
4-11