Am Sonntag, 19. April 2020, 15:52:25 CEST schrieb tokafondo: > <http://cbm-hackers.2304266.n4.nabble.com/file/t374905/Captura_de_pantalla_d > e_2020-04-19_14-42-34.png> > > This is a timing I've though of the memory accesses the 65xx chips does > during a 1Mhz cycle. > > After posting in other places, it seems that the actual /free/ time the > memory is *not* accessed is not /always/ the same. > > So I'm thinking that after pinning in a logic analyzer with high resolution > and large logging capabilities, /holes/ in the timing could be found so an > external /third player/ could be fit to make it access the memory with no > intervention of the VIC or the CPU -- talking about the C64 here. > > That would open the posibility of a /dual core/ C64, where an external CPU > could do things /a/side or /be/sides the main one, like drawing graphics > while the 6510 is doing other things, or making fast calculations. > > Having the dot clock output pin in the expansion port would do things > easier, as everything would be clocked at the same speed the VIC is ticking. > > Comments, corrections and discussions are not only welcome but encouraged. it could work - however, keep in mind the access scheme is not fixed, the VICII will use more bandwidth in badlines, and when sprites are active (have a look at the "VIC Article" by christian bauer) -- http://hitmen.eu http://ar.pokefinder.org http://vice-emu.sourceforge.net http://magicdisk.untergrund.net Der Prophet gilt nichts im eigenen LAN.Received on 2020-05-30 01:26:46
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