James Littlejohn wrote:
julian814 wrote:James Littlejohn wrote:I did manage to find some pictures of somebody's attempt to make a switchable overclock card for the //c. Could use some text to explain a few things, but otherwise, it seems simple enough. RalphIs this what you were talking about? http://www.applefritter.com/node/9898#comment-40158 This was my project. I will answer any question you have about it. (It was pretty straight forward.)Yes, that was it! I'd love to be able to make one of these for my //c+ as well. Thank you!Well, I just threw this together real fast so please be kind. http://8bitsystem.com/computerIIc+/IIC+start.html
James, you don't need to switch the power (+5v), you can just let both oscillators run all the time. That "extra" pin, pin 1, is the output enable pin. You could probably just wire all oscillator lines in parallel and switch pin 1 high on (only) the oscillator you want to use. (The only potential downside is not all oscillators support pin 1 OE, but the datasheet will say.) -michael NadaNet networking for Apple II computers! Home page: http://members.aol.com/MJMahon/ "The wastebasket is our most important design tool--and it's seriously underused."