CM-64 / Cable-Pinout

Discussion about old sound cards, MIDI devices and sound related accessories.

CM-64 / Cable-Pinout

Postby McBierle » 2019-10-31 @ 19:39

"Quick" question:
I recently got a CM-64 without cables. I made a cable via this http://amorphe-welt.de/bastelei/midi/midikabel.html

DIN - D-sub
---------------
2 - 4
4 - 8
5 - 15

After a quick test i diddn't get sound, so i want to know if this pinout is correct, so i can rule the cable out.

Thanks
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Re: CM-64 / Cable-Pinout

Postby keropi » 2019-10-31 @ 19:48

this is a simple schematic for a gameport->midi-out adapter:

Image

you connect it to the CM-64's IN port and it will work fine... straight cable connections are not a good idea.
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Re: CM-64 / Cable-Pinout

Postby McBierle » 2019-11-01 @ 00:58

Ok thanks, if i get a 74LS00 i'll do that thing.
But, should i have gotten sound or not? What will/would happen with a straight connection?

What about those midi/gameport-cables you can get on amazon/ebay? Do the have this circuit?
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Re: CM-64 / Cable-Pinout

Postby gdjacobs » 2019-11-01 @ 03:07

Quite a few ways it can go wrong when directly connected. Part of the reason for the physical connection spec is that it's much more predictable.
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Re: CM-64 / Cable-Pinout

Postby Tiido » 2019-11-01 @ 05:45

With direct connection there may not be enough current to drive the LED in the optoisolator on the receiving end, depending on what sort of resistor is used in series with the MIDI line.
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Re: CM-64 / Cable-Pinout

Postby McBierle » 2019-11-01 @ 15:20

keropi wrote:this is a simple schematic for a gameport->midi-out adapter:

Image

you connect it to the CM-64's IN port and it will work fine... straight cable connections are not a good idea.


Ok got a 74LS00. Ist pin 15 not connected? or ist there a line missing in that graphic`? And 8 and 9 are not connected?
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Re: CM-64 / Cable-Pinout

Postby derSammler » 2019-11-01 @ 15:48

This is for MIDI Out only. Other pins are needed for MIDI In.
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Re: CM-64 / Cable-Pinout

Postby keropi » 2019-11-01 @ 19:15

yes the schematic is edited to only include the MIDI out port , the IN port requires some more components and it is not needed for gaming/playback
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Re: CM-64 / Cable-Pinout

Postby gdjacobs » 2019-11-01 @ 20:13

By convention NAND gate pins 1, 2, 4, and 5 should be strapped to ground (or +5V) and not allowed to float.
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Re: CM-64 / Cable-Pinout

Postby McBierle » 2019-11-02 @ 20:50

One more question (for now), why midi out? I thought that would go to some other midi device...
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Re: CM-64 / Cable-Pinout

Postby derSammler » 2019-11-02 @ 21:17

MIDI Out from the sound card goes into MIDI In on the CM-64. That's how MIDI devices are connected.
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Re: CM-64 / Cable-Pinout

Postby McBierle » 2019-11-02 @ 21:19

Yes exactly, but in that pic/schematic the din-connector is "midi out".

edit: i know, i'm counting beans here. I know that the midi signals are going out on that side. But if you have a connector on a device that is called "midi out" i would use another description :D
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Re: CM-64 / Cable-Pinout

Postby McBierle » 2019-11-08 @ 19:05

Oh i forgot, many thanks it works!

WP_20191108_003.jpg
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