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Hello everybody<br>
<br>
I'm in the process of restoring my OB-Xa. In manual mode it now
works perfectly, but as soon as I edit a sound from memory, all
kinds of parameters are no longer correct. I suspect the MIDI
interface and the 120 program slot expansion.<br>
<br>
This is what the MIDI interface with the SRAM chip looks like:<br>
<a class="moz-txt-link-freetext"
href="https://www.florian-anwander.de/oberheim_obxa/OB-Xa-MIDI-interface.JPG"
moz-do-not-send="true">https://www.florian-anwander.de/oberheim_obxa/OB-Xa-MIDI-interface.JPG</a><br>
The EPROMs on the control board look like this:<br>
<a class="moz-txt-link-freetext"
href="https://www.florian-anwander.de/oberheim_obxa/OB-Xa-MIDI-interface-EPROM.JPG"
moz-do-not-send="true">https://www.florian-anwander.de/oberheim_obxa/OB-Xa-MIDI-interface-EPROM.JPG</a><br>
<br>
The memory expansion obviously uses a 6116 SRAM. The original 6514
(IC109 and IC111) have been removed.<br>
I have not found a picture of an identical MIDI interface on the
web.<br>
<br>
<br>
Do any of you know which manufacturer this MIDI interface is from?<br>
<br>
Best Regards<br>
Florian<br>
<br>
(I've sent the same mail to the oberheim group at groups.io - sorry,
if it reaches you twice)<br>
<pre class="moz-signature" cols="72">--
<a class="moz-txt-link-freetext" href="http://www.florian-anwander.de/"
moz-do-not-send="true">http://www.florian-anwander.de/</a></pre>
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