High Performance Disk Interface Circuit Pack (Nt6M66Xx); General Description - Nortel DMS-100 Series Manual

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High Performance Disk Interface
circuit pack (NT6M66xx)

General description

The High Performance (H.P.) Disk Interface circuit pack, in slot 11 of the A
and B chassis, is a smart circuit assembly, with its own Z80 microprocessor,
EPROM, local RAM, and dual-ported RAM. It is a peripheral of the
microprocessor on the main CPU at slot 1. The H.P. Disk Interface circuit
pack is used only in Non-Turbo DPP systems equipped with 5 1/4" disk
drives (72-, 140- or 380-Mbyte).
The H.P. Disk Interface circuit pack is the link to the disk drive and transfers
data to and from the bus used for recording on or reading from the disk. The
stored program on the H.P. Disk Interface circuit pack provides the write and
read commands to the disk drive.
System interface is via the 100-pin edge connector.
See Table 8-1 for the two option jumpers on the circuit pack. Figure 8-1
shows jumper locations and circuit pack layout.
DPP Hardware Component Replacement Guide DPP001 and up
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