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INTEGRATION INTO THE SYSTEM
To install the Adaptec ACB-2070A board into your sys-
tem you must first configure the drivels), set the controller
jumpers and connect the drive cables properly. This
section describes all the necessary steps needed to
successfully install this hardware.
The controller must match the drive parameters, i.e.,
number of Heads, number of cylinders, step pulse rate,
etc. in order to function successfully. The drive parameters
are divided into two categories; one being the drive
changeable parameters and two, the controller change-
able parameters.
DRIVE SELECTION AND TERMINATION
The drive changeable parameters are the drive selec-
tion switches (or jumpers) and the drive termination. These
parameters allow a drive to be selected as drive 0,
1.
2 or 3. This is accomplished by changing the drive
address selection switches or jumpers.
Before the drives can be cabled to the controller the
drive cable terminator must be properly set. The termi-
nator, as its name implies, must be at the end of each
cable in order to have the controller and drive communi-
cate properly. The controller has a permanent terminator
built in. The disk drives, since they can be connected in
a daisy chain configuration have a removable terminator.
This is usually a 16-pin DIP resistor package. The last phys-
ical drive in the chain must have its terminator installed.
CONTROLLER JUMPER SELECTION
The controller changeable parameters are defined as
the variables that can be changed to accommodate
the different drive characteristics. These parameters can
easily be changed by jumper(s) or defined by the user
for the drive being used.
DRIVE TABLE SELECTION JUMPERS
The ACB-2070A has drive tables for the most commonly
used drives. These tables reside in the Adaptec ACB-
2070A BIOS EPROM.
The drive tables in the ACB-2070A BIOS support the drives
as defined in Table 1. These drive tables are selected
by jumpers on the board. Other drives can be attached
to the ACB-2070A by use of the user-defined parameters
described in the software installation section.
NOTE:
The ACB-2070A is shipped already configured to be used
with a Seagate ST-238
38 MB RLL (25 MB MFM) unformatted,
or equivalent
25 MB drive. (See BIOS Table 0 of Table 1.)
4
TABLE 1.
ACB-2070A DEFAULT DRIVE TABLES
BIOS
BIOS
BIOS
BIOS
Table 0
Table 1
Table 2
Table
3
Drives Supported Seagate
Tandon
Micro-
ST-238
TM 755
science
MiniScribe
Vertex
HH-330
3438
V150
Formatted
With MFM
20MB
10 MB
40MB
20MB
With RLL
30MB
15MB
60MB
30MB
Step Pulse
3
3
3
3
Code (Rate)
(13 IlSec)
(131lSec)
(13IlSec)
(13IlSec)
Number of
4
2
5
4
Data Heads
Number of
615
612
981
612
Cylinders
These four tables are selected by jumpers M-N. O-P for drive 0
and Q-R, S-T for drive 1. Table 2 defines the jumper selection of
each drive and table.
TABLE 2.
JUMPER SELECTION OF DRIVE TABLES
BIOS Table for Drive
0
Installed
Removed
0
M-N and O-P
1
M-N
O-P
2
O-P
M-N
3
M-NandO-P
BIOS Table for Drive 1
Installed
Removed
0
Q-RandS-T
1
Q-R
S-T
2
S-T
Q-R
3
Q-RandS-T
NOTE:
No need to worry about these jumpers if format param-
eters are specified in primary format section.
5
TABLE 3.
HIGH-PERFORMANCE JUMPERS
Jumper
Installed
Removed
A-B
Reserved
Reserved
C-D
Reserved
Reserved
E-F
Drive 0 is a Removable
Soft-sectored
Cartridge Drive. SQ319R
ST506-type drive.
G-H
Drive 1 is a Removable
Soft-sectored
Cartridge Drive, SQ319R
ST506-type drive.
I-J
Selection of JO and J1
Selection of JO
Reversed
and J1 as defined
in next Section.
K-L
Self Diagnostics
DRIVE AND CONTROLLER CABLING
Now that the drive and controller are configured, they
can be connected together. The controller has three
cable connectors JO, J1 and J2.
The connector locations and pin orientation for
ACB-2070A connectors are shown in Figure 1.
NOTE:
When mounting in the IBM PCIXT. pin 1 of the connector
and coble will be facing down. The two connectors JO and
J2, along the outside edge of the boord, are used when
only one drive is present. All three connectors JO. J1 and
J2
are used when two drives are present. Remember that
the lost physical drive in the chain must have the termi-
nator installed.
Mount the drive, controller and cables inside the Pc.
6
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