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DMX SOFTWARE REVISIONS
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The Cassette Interface (and other functions) in the DMX have undergone
several revisions since the DMX was first introduced. These revisions are
noted here.
DMX 1.00 - This is the original software release, shipped in units
starting in November 1981.
DMX 2.00 - The DMX software Revision 2.00 (shipped in units starting
with serial numbers B20801) contains a new cassette
interface. This interface is much more tolerant of the
data played back into it, and the volume setting does not
have to be set as high as with the original software (DMX
1.00), although an speaker or earphone level output is
still required.
Note that tapes recorded on the original DMX software
(1.00) cannot be played into newer DMX's (2.00 and 2.10)
and vice versa.
DMX 2.10 - Many tape recorders invert the phase of the signal
during the recording process, causing problems during
data transfers. This software version (shipped in units
starting with serial number B22505) enables inverted
data to be read properly by the DMX Cassette Interface.
To set the DMX to read inverted data, hold the "0"
button while pressing CHECK or PLAY. The first digit of
the display will show a "!", indicating that the DMX is
expecting inverted data.
To display the software version contained in the DMX, press "3", "5",
and "7" simultaneously.
Any DMX may be retrofitted with new software by bringing the unit to one
of Oberheim’s authorized service centers.
BATTERY BACKUP
The DMX contains a rechargeable battery that maintains power to the
memory even when the DMX is unplugged. This way you can turn off the power
and/not lose your sequences, much like the battery backup in the OB-Xa
Polyphonic Synthesizer. However, the memory in the DMX is much larger, and
as a result a rechargeable Nickel-Cadmium battery is used.
With normal use the battery will rarely be drained completely, since the
battery is able to maintain power to the memory for several weeks, when
fully charged. However, if the battery does become completely discharged,
leave the DMX plugged in and turned on for 14 hours to fully recharge the
battery.
As a safeguard, you should record important sequences onto cassette,
using the Cassette Interface.
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