ejbehr@rs6000.cmp.ilstu.edu (Eric Behr) (04/05/91)
First, this may be a wrong group, but I couldn't find any better one... I spent an evening putting together a MIDI interface designed by Kent Boortz (boortz@sics.se; I forget where I got the nice PostScript file with the plan). Instead of the Sharp PC900 optoisolator which he recommends, I used an MCT-2 (GE?) which I saw used in other interface designs. Then I saw an ad with MIDI-related stuff, which lists a "hard to find essential component, the PC900 chip". As far as I can tell, the PC900 has the same pinout as most standard chips, including the MCT-2; it may be faster, but the interface I tried to make has 500MHz clock, so any reasonably fast optocoupler should work, no? Is PC900 really "essential"? Needless to say, my interface doesn't work :-( I don't have a scope, so I can't say exactly what's going on. Thanks for any help you can offer. E. -- Eric Behr, Illinois State University, Mathematics Department Internet: ejbehr@rs6000.cmp.ilstu.edu Bitnet: ebehr@ilstu