Integration Into The System - Adaptec ACB-232XD User Manual

CAUTION: The values for the power requirements were determined by actual
measurements in an IBM PC AT while the controller was reading a hard disk. If these
values are to be used to design the controller into a specific application, at least 20%
should be added to these listed values as a safety margin.

2.6 Integration Into the System

To install the Adaptec ACB-232XD board into your system, you must first configure the
drive(s), set the controller jumpers, and connect the drive cables properly. This section
describes all the necessary steps to successfully install this hardware.
Step 1 Controller Jumper Setup and Definition
Before the Adaptec ACB-2322D can be used, some initial setup may be required. Figure 2-
1 defines, in detail, connectors and jumper blocks for the ACB-2322D.
Step 2 Hard Disk Cabling, Drive Selection and Termination
The drive changeable parameters that must be set are the drive selection switches (or
jumpers) and the drive termination. The drive selection switches and cabling select the
address (drive address 0-3 ) to which the drive will respond. This is accomplished either by
setting both drives to be the second lowest address and using a twisted 34-pin cable, or by
setting the drive addresses to 0 and 1 and using a flat cable.
A. Twisted 34-Pin Cable
The typical AT 34-pin cable has three connectors. Between the first (middle) drive
connector (for drive D) and the second drive connector (for drive C) wires 25 through 29
are twisted, thus inverting the drive selection wires. This type of twisted cable allows both
drives to have their drive selection switches (or jumpers) to be the same. Both drives must
be set to the SECOND lowest drive address. The controller will see the two drives to be
drive 1 and drive 2, depending on the position of the connector that is used.
B. Flat 34-Pin Cable
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ACB-232XD User's Manual
TABLE 2-2. ACB-2322D POWER REQUIREMENTS
+5V Power ----------------------------------> 0,870 Amp
-5V Power ----------------------------------> Not Used
+12V Power --------------------------------> Not Used
-12V Power ---------------------------------> Not Used
TABLE 2-3. ACB-2320D POWER REQUIREMENTS
+5V Power ----------------------------------> 0,670 Amp
-5V Power ----------------------------------> Not Used
+12V Power --------------------------------> Not Used
-12V Power ---------------------------------> Not Used
(Typical)
(Typical)
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