Re: Article PC-card

From: Ruud Baltissen (
Date: 2001-04-04 12:42:49

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
> 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

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