HP 330 Service Information Manual page 115

System Interface Board
Introduction
The HP 98247 A System Interface Board meets most, if not all, I/O needs of the Design Au-
tomation marketplace. Functions possible with this board card includes:
• RS-232.
• HP-IB.
• Audio Jack.
• HP-HIL.
• LAN.
• DMA.
• Optional High-Speed Disc HP-IB Interface Add-On.
The system interface board allows this wide range of interfaces at the minimum cost. The
LAN and optional high-speed disc interface add-on allows users to choose the interfaces that
are necessary for their application.
To maintain software compatibility, the designs of several existing interface cards used in the
Models 310/320 were integrated together. Cards emulated on the system interface board are:
• HP 98625B High-Speed Disc Interface.
• HP 98643 Local Area Network (LAN)/300 Link.
• HP 98620B DMA Controller.
• 98561-66532 Human Interface Card.
Each of these sections of the board operates independently from one another. Interfaces are
identical to the earlier 98561-66532 Human Interface Card. Software compatibility is assured.
Figure 3-23 is a block diagram of the system interface board. Refer to this diagram for functional
descriptions.
Functional Description
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