Bryan Posted May 23, 2014 Share Posted May 23, 2014 I need to make some banked 5200 carts, and I can't remember if I used a 2.2K resistor or a 2.7K resistor in the address delay circuit. Could someone pop open a MULE cart can tell me what's there? My guess is that it's a 2.2K because I seem to think I changed it after making the boards which say 2.7K. Thanks! -Bry Quote Link to comment Share on other sites More sharing options...
Charlie_ Posted May 23, 2014 Share Posted May 23, 2014 Help? 2 Quote Link to comment Share on other sites More sharing options...
Bryan Posted May 23, 2014 Author Share Posted May 23, 2014 Help? Awesome, thanks! I had it the wrong way around. The board says 2.2K but it's a 2.7K. Quote Link to comment Share on other sites More sharing options...
Charlie_ Posted May 23, 2014 Share Posted May 23, 2014 Awesome, thanks! I had it the wrong way around. The board says 2.2K but it's a 2.7K. Glad I could help! 2 Quote Link to comment Share on other sites More sharing options...
BigO Posted May 23, 2014 Share Posted May 23, 2014 "5200 goes here". Heh. Quote Link to comment Share on other sites More sharing options...
Bryan Posted May 24, 2014 Author Share Posted May 24, 2014 "5200 goes here". Heh. Yeah, when I made the board I meant to put mask over the vias which would have preserved much more of the text. Quote Link to comment Share on other sites More sharing options...
CPUWIZ Posted May 24, 2014 Share Posted May 24, 2014 Why do you need a 2.7K for the RC oscillator? I always use 2.2K's for 20V8's. Quote Link to comment Share on other sites More sharing options...
Bryan Posted May 25, 2014 Author Share Posted May 25, 2014 I don't use it as an oscillator, I use it with the 68pF cap to delay an address match (or, more precisely, filter out spurious bank-switch matches that can occur during address transitions) since Atari didn't see fit to run the CPU clock to the cartridge on 4-ports. My original calculated value was 2.2K but watching it on a scope I decided I liked 2.7K better and the parts are fast enough not to care. Quote Link to comment Share on other sites More sharing options...
atariron82 Posted May 26, 2014 Share Posted May 26, 2014 Help? Nice M.U.L.E. cart, Official Ninja That's one 'unicorn' I'm still trying to chase down... Quote Link to comment Share on other sites More sharing options...
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