The ISA-Bus

One blog to bind them all.

Two Cards on One Port

Common wisdom has it that you can’t have two devices set to the same port. This may not be true in all cases. At the moment, I have a 286 with a Roland SCC-1 and a Sound Blaster 2.0 (CT1350B). The SCC-1 is set to the default value of 330h, and the MIDI port of the Sound Blaster cannot be configured anyway.

Yet they both work. I can play General MIDI files with the SCC-1, play games with an external module hooked up to the SCC-1, and play MT-32 MIDI files with an external module hooked up to the Sound Blaster’s MIDI port (which both GSPlay and MegaMID support).

The only program that can get confused by this setting is Roland’s CSSCHK utility. Sometimes it works fine, sometimes it reports, not incorrectly, that the port is taken up by another device, and won’t let me set the SCC-1 into MT-32 emulation mode. That’s not really a problem since there are other ways to do this.

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