Changes
:Strange. Then it isn't OC at all. Do you really get Com=5V; when the mouse interface isn't connected? My CPC outputs only short 1V level, no long 5V levels. And can you upload the datasheet page somewhere? I'd bet two EPROMs that you've misread it... maybe the diode pulls down spikes above +5V or so?
:> I dropped the voltage on the CPC to 4.5V to simulate heavy hardware load...
:Wow, seriously? I never got so far when testing. Maybe that's why I am sometimes running into problems, with circuits that work on one computer, and not on another :-)
:Your tests didn't really cover timing stuff (ie. the situation where you need Com to get HIGH quickly), only voltage loads. --[[User:Nocash|Nocash]] 13:43, 10 April 2010 (UTC)
::PS. You are right, in normal speaking "register" means storing information. But in computer language it very often used as synonym for "I/O ports", which usually do have a storage function, but not always. I've never noticed that saying "register" could be wrong in that cases.
::Anyways, how did we get there? The thing we were talking about was the output (directly from the PIC, not from the 74LS240, and not anything more distant inside of the CPC).
::The cpcwiki page says 1/300s, but in the forum you said 2/300s. Which one is correct? --[[User:Nocash|Nocash]] 16:04, 12 April 2010 (UTC)
