Is this a standard null-model serial cable?

I think so. I scrounged an extra cable to hook it up to my second computer, and it worked without a hitch. I don't even know if the extra cable was anything special, it was just a 9-pin that I found lying around with the right connectors.

You could simply try one. The worst thing it could do is not work.

Tony Fabris
Empeg #144