Patrick Schaefer wrote:
Michael J. Mahon schrieb:(...) I have several 32MHz oscillators, and found that one type would not work, while another (RXD 1100) did, so maybe the problem some have reported is an oscillator problem, not a IIc+ problem...Some of these oscillators have an output enable pin. You can leave it unconnected, but when you tie it to the wrong logic level the oscillator will stop.Or otherwise, if anything relies on this function (e.g. to select one of multiple oscillators connected in parallel), it would fail when the OE is not available.
In my case, a scope verified that both oscillators were producing output (at least with the scope connected ;-), but only one correctly drove the clock circuits of the accelerator. Interestingly, the one that *didn't* work seemed to have a somewhat higher output... -michael NadaNet file server for Apple II computers! Home page: http://members.aol.com/MJMahon/ "The wastebasket is our most important design tool--and it's seriously underused."