Hardware Installation
Adaptec AHA™-1510A AT®-to-SCSI host adapters
are designed to operate as shipped in most AT-
class computers. The default settings are:
SCSI Disconnection* Enabled
SCSI Address*
7
SCSI Parity* Enabled
Terminators Installed
Terminator Power Supplied by host adapter
Synchronous Negotiation*
Disabled
Interrupt Channel
11
AT Port Address* 340h
Data Transfer Mode*
Programmed I/O
* These values are set by the aspi2dos software
driver, provided with Adaptec EZ-SCSI or the
ASW-1210, and by command line options in the
config.sys file (see
Software Installation).
Installing the Host Adapter
Turn OFF and disconnect power to the system and ex-
documentation for instructions on removing the sys-
tem cover and adding option boards.
1
Remove the cover of your computer to expose
the AT expansion slots.
2
Locate an unused AT expansion slot. AT-type
slots have two edge connectors (one 62-pin and
the other 34-pin) in line with each other.
3
Remove the expansion slot cover for this slot.
4
Align and insert the host adapter into the AT
slot. Use the expansion slot cover screw to
secure the host adapter to the frame.
5
Attach the SCSI cable(s) to the host adapter
and the peripherals, using the internal and/or
external connector(s). Be sure to maintain pin-l
orientation throughout the SCSI bus.
6
If the host adapter is not the first or the last
device attached to the cable (i.e., if both inter-
nal and external connectors are used), remove
the SCSI terminators from the host adapter.
7
Replace the cover and connect the power.
1
Jumper Configuration Reference
Setting Termination
One jumper block on the host adapter is used to con-
figure user-selectable options. In the following dia-
gram, the black bar covering both pins represents
an installed jumper. In most cases, you will not
need to change these settings.
Jumper Block J9 (IRQ Channel, Port Address)
The SCSI bus must be terminated correctly to
ensure proper operation of the AHA-1510A host
adapter. Terminators must be installed in the first
and last physical devices on the SCSI cable and
removed from all other SCSI devices. The three
factory-installed terminators on the host adapter
are located below the internal SCSI connector, as
shown in this diagram:
Jumper block J9 default settings:
Pin Pair
I2, I1,
I0, I9
AL
Description
Determines IRQ channel
IRQ 12
= jumper I2
IRQ 11* = jumper I1
IRQ 10
= jumper
IO
IRQ 9
= jumper I9 (not recommended
with Windows 3.x)
Determines port address range
340h-35Eh* = no jumper
140h-15Eh = jumper
An extra jumper is provided in case you want
to install it on the pin pair to change the port
address.
* Default configuration
l
One, and only one, of the IRQ channel pin pairs
must be jumpered. If you change the setting
from the default of IRQ 11 (pin pair 11) you must
also change the /q option when you install
aspi2dos (see Software Installation).
l
If another Adaptec SCSI host adapter is already
installed in your computer, change the interrupt
of the AHA-1510A to something other than
IRQ11.
l
If you change the default port address by install-
ing the extra jumper on pin pair AL, you must
also change the /p option when you install
aspi2dos (see Software Installation).
2
r
The table below shows how termination should be
set for the three possible SCSI device and host
adapter configurations.
Devices Connected to
I
Host Adapter
Host Adapter
Terminators
Internal devices only
I
All three installed
(host adapter at end of cable)
External devices only
All three installed
(host adapter at end of cable)
Internal and external devices
All three removed
(host adapter in the middle)
3
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