Hallo Nicolas, > I wonder what is different in the C64: Many other Commodores use the same > clock sharing (like the VIC-20, probably some PETs/CBM-IIs, the dual drives > and some printers. The only unique thing about the C64 is the ability to > actually stop the CPU completely. See previous mail: The reason is technically: (if my memory serves me well) the 6522 already expects a valid address on the rising edge of CLK2. And we all (should) know that the VIC-II controls the lower half of CLK2. To be sure I'll have a peep in my databooks. I at least have the ones of CMD and UMC. Maybe I even find differences. BTW, does anybody know how (in)compatible the 6520 with a 6821 is? (AFAIK I have NO datasheets of the 6520 :( ) Groetjes, Ruud http://Ruud.C64.org - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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