One more reason for keeping those old legacy computers around...

My old Atari Mega ST4? Bulletproof sys-ex (and built-in MIDI!)

My old serial port Mac clone (Starmax) and serial MIDI interface? Bulletproof sys-ex.

My current old Mac (Quicksilver733 ) and Midex3 MIDI interface? Bulletproof sys-ex in OS9 and OSX Panther.

Newer ain't necessarily better...
_________________________
An arranger is just a tool. What matters is what you build with it..!