My FM TOWNS was locking up whenever something tried to access the MIDI board. I suspected a dodgy oscillator, and sure enough, hitting the clock chip on the Roland daughtercard with some hot air got it working again (at least for a bit until the chip cooled down and got stuck again). My Internet search skills are failing me at finding a decent replacement IC though—"6161A oscillator" doesn't seem to bring up any relevant hits, and neither Mouser nor Digikey seem to have a modern replacement with the same 0.57x0.18 inch (14.5x4.6 mm) four-pin form factor. On the off chance anyone else has run into this problem with their Roland gear and managed to fix it, I was wondering if you all recognized this chip or knew of a good replacement.
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