Audio/Capture/Playback Adapters.
Input and Output Devices.
Guidelines:
Music applications: 20 Hz to 20 KHz 3.5 db
Some IMPORTANT
The best audio quality (Signal to Noise ratio) from the ACPA may be
Available Diagnostics
From the ACPA-Adapter Diskette, (shipped with the adapter) copy one file (using the command)
Remove the Diskette from drive A: and change to the C: drive
Jumper setting
Input/Output Address Switch (SW1-ADDR.)
Interrupt Jumper (JPR4-INT.)
Features:
Please see the LEGAL - Trademark notice.
Item
FRU P/N
Adapter / MicroChannel Computers
34F2787
Adapter / AT-Bus Computers
34F2783
3.5mm mini jack connector / max. 600 Ohms impedance (CARDIOID pickup pattern)
cable length <= 1.8 meters (6 feet) / Open circuit voltage sensitivity level between
-60 (more sensitive) and -80 db (less sensitive).
NOTE: Microphone sensitivity is based on 0db = 1 volt per micro bar.
More sensitive microphones allow table top use. Less sensitive microphones
generally require hand-held operation.
Frequency response (frequency curve) depends on desired quality and application.
Speech applications: 50 Hz to 12 KHz 5 db
4-8 ohms Shielded cables with 3.5mm stereo mini jack connectors to plug into the Audio Adapter
and connectors on the other end to match the speakers.
8 ohm minimum / 3.5mm stereo mini jack.
Shielded cables with 3.5mm stereo mini jack connectors to plug into the
Audio Adapter with connectors on the other end to match to the other audio equipment
(typically this will be male RCA jacks or Chinch connectors)
obtained by adhering to the following guidelines:
a. For optimum performance, place the ACPA as far as possible
from other adapters.
b. The computer should have its cover on and secured. All
unoccupied board slots should have a metal bracket installed.
c. The cables used with ACPA should be shielded, as short as
possible (less than 1.8meters (6 ft.)), and not tangled. Attempt
to place the audio and video cables at maximum distance from
each other.
d. Avoid unnecessary plugging and un-plugging connections to the
ACPA as this tends to degrade the quality of the cable to
board connection.
>COPY A:\DIAG\ACPADIAG.EXE C:\ACPA to the harddisk
and the ACPA directory and enter ...
ACPADIAG for basic test or ACPADIAG /A ... for advanced testing.
(The tests should start, guidance is available by screenoutput)
No jumper setup is required (the jumper on JPR4 must be as shown).
ADDR
10
9
8
7
6
5
4
3
310h *)
On
Off
Off
On
On
On
Off
On
318h
On
Off
Off
On
On
On
Off
Off
330h
On
Off
Off
On
On
Off
Off
On
338h
On
Off
Off
On
On
Off
Off
Off
368h
On
Off
Off
On
Off
Off
On
Off
710h
Off
Off
Off
On
On
On
Off
On
718h
Off
Off
Off
On
On
On
Off
Off
730h
Off
Off
Off
On
On
Off
Off
On
738h
Off
Off
Off
On
On
Off
Off
Off
768h
Off
Off
Off
On
Off
Off
On
Off
Int.#
J1
J2
J4
2
X
3 *)
X
X
4
X
5
X
X
6
X
X
7
X
X
X
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