Chapter 3: Functional Description - HP 330 Service Information Manual

Direct-Connect Expanders
Two expanders are available for these computers. Each connects to the computer through a
rigid connection to the motherboard. Only one can be used at a time.
HP 98568A Expander, Opt.132
Option #132 modifies the existing HP 98568A to support the 32-bit DIO-II backplane. It adds
eight DIO slots to the system in the same way that the HP 98568A without the option adds
DIO slots for the Models 310/320, but with a different physical connection.
Support for DIO cards follows the same rules as for Models 310/320: interface cards may
only be located in every other slot. Accessory cards may be installed in any slot. And since
the smaller DIO-RAM (256K and 1 Mbyte) boards and DMA accessories don't work, for all
practical purposes this 8-slot expander is really a 4-slot DIO interface expander.
HP 98570A Expander
Here's a new expander that adds two DIO-II system slots and four DIO slots. An available
option deletes the 4-slot DIO backplane and converts the 98570A to 4 system slots.
HP 9888A Expander
For 16 slots, the HP 9888A is plugged into any available DIO slot in the computer. Up to two
HP 9888A expanders are supported and provide 16 functional DIO slots (a total of 32 DIO
slots) for interface cards.
Accessory cards using DMA are not supported in the HP 9888A Expander.
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Functional Description