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5.0
ST506 INTERFACE DESCRIPTION
5.1
INTRODUCTION
The ST506 Interface is an industry standard for connecting 5 1/4"
Winchester disk drives to disk controllers.
The ST506 interface
is based on an interface developed by Seagate Technology for the
ST506 and ST4l2 disk drives.
This interface has since been
implemented in a majority of 5 1/4" disk drives.
The ST506
interface, as implemented by the ACB-5500, is characterized by 5
Mb/s data and an MFM encoding scheme.
5.2
INTERFACE SIGNALS
The ST506 interface consists of a control cable and one or more
data cables.
The control cable is multi-dropped from the ACB-
5500 to all attached disk drives.
The last drive on the daisy
chain must have resistive terminators installed to terminate the
control cables.
The data cables are radially connected between
the ACB-5500 and a single drive.
To use the ACB-5500 with four
drives, the maximum supported, one control cable and four data
cables are required.
Figure 5-1 shows the ACB-5500 cabled for
this configuration.
500504-00
5-1
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