E-mu Emulator Sampler User Forum for the EIII EII EI and EIII XP - Strange SP-12 turbo problem

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+  E-mu Emulator Sampler User Forum for the EIII EII EI and EIII XP
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| |-+  Drumulator Technical Issues / Tips
| | |-+  Strange SP-12 turbo problem
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Author Topic: Strange SP-12 turbo problem  (Read 1055 times)
razo
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« on: June 26, 2016, 02:36:37 AM »

When downloading samples from my SP-12 turbo it halts every time at exactly 16 seconds when using both Drumfile and SP-12 Librarian software. When uploading samples it stops at about 17.8 seconds, every time. What could cause this problem?
I have tested sampledumps for other samplers so I know that its not a problem on the Mac SE30 / midiinterface. I did all the tests via the SP-12 Debug Eprom (midi and memory) and they where ok. I also reseated all ics in sockets.
« Last Edit: June 26, 2016, 02:48:36 AM by razo » Logged
esynthesist
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« Reply #1 on: June 26, 2016, 05:28:11 AM »

Although I have never heard of this kind of problem when using a vintage Mac (with DrumFile or SP12 Librarian), the problem sounds familiar to me based on my experience when I was adding support for SP12 MIDI communication in the EMXP software.
Perhaps the problem is caused by the MIDI interface connected to your Mac SE30.

FYI: the SP12 violates the general MIDI MMA standard when sending SYSEX messages. When transferring large chunks of data (like large samples or full banks) the SP12 will start exchanging incompatible MIDI messages at some point in time. It's not doing this all the time, it depends on the location of the data in its memory. That's why initially (the first 15-20 seconds) everything is working fine.

I didn't find any modern MIDI interface (and/or MIDI driver) for Windows or Mac OS X which is able to deal with these incompatible messages from the SP12. As a consequence I had to add specific code to EMXP to try bypassing this issue.

But I assumed that the old MIDI interfaces and drivers for Macintoshes were more tolerant and were all able to pass non-MMA SYSEX messages as well.
E.g. the OPCODE MIDI TRANSLATOR II interface with OMS should work fine between a Mac and the SP12.

But maybe there are some MIDI interfaces for Macintosh which are not that tolerant for non-standard MIDI messages.

What MIDI interface are you using ?



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razo
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« Reply #2 on: June 26, 2016, 06:14:41 AM »

Hi, i am using Opcode Studio 4 with oms v 1.2.3 on OS7.1.
I also have an Emagic AMT-8 midiinterface that i could try, but I haven´t found the driver for it yet.
« Last Edit: June 26, 2016, 06:33:11 AM by razo » Logged
esynthesist
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« Reply #3 on: June 29, 2016, 10:12:58 AM »

I was hoping that I would have an Opcode Studio 4 available by now in my studio in order to have a look how it reacts on invalid MIDI messages, but I didn't succeed in getting one yet, something went wrong.
But I'm still trying.
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razo
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« Reply #4 on: September 21, 2016, 08:02:48 AM »

I´ve now had the SP12 at the tech; he says its difficult to troubleshoot the unit because it has a proprietary Midi sysex (dump) specification.. so it will be very expensive to have him work further on the unit. My idea now is to try to replace some of the IC´s and try to fix it myself.
These units have boomed in price on ebay now  Shocked  
« Last Edit: September 21, 2016, 08:04:20 AM by razo » Logged
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E-mu Emulator Sampler User Forum for the EIII EII EI and EIII XP - Strange SP-12 turbo problem

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