On Montag 23 August 2010, you wrote: > On Mon, 23 Aug 2010 Ruud@Baltissen.org wrote: > > Regarding the model, it is in fact based on my TTl6502. And Gideon > > couldn't detect any flaw :) Using this model I discussed my finding > > that IMHO all the cores I know, including Gideon's, treated NMI as > > level triggered. The docs state that the NMI in the 6502 is edge > > triggered. He agreed with my findings. But so far it never caused > > problems, so why changing it? I gave him an example where things > > could go wrong. Anyway if the docs state edge triggered, why not > > implementing it? > > How would the NMI even work if it is implemented as level triggered? > It's _non_ maskable. If strictly level triggered it will just endlessly > retrigger the interrupt with no chance to ack, no? and thats what happens actually, and its why there is a RC element wired to the restore key :) -- http://www.hitmen-console.org http://magicdisk.untergrund.net http://www.pokefinder.org http://ftp.pokefinder.org A 'hacker' is any person who derives joy from discovering ways to circumvent limitations. <Robert Bickford> Message was sent through the cbm-hackers mailing listReceived on 2010-08-23 19:00:40
Archive generated by hypermail 2.2.0.