register-impoverished childhoods was Re: Z80 TRAP and CP/M
spectre at floodgap.com
Tue Apr 4 19:15:51 CDT 2006
> > > E.g., if you are writing code for a 68xx, you have little choice
> > > but to do everything in memory addressing.
> > Or a 6502. I don't know what to *do* with all the other registers on
> > other architectures. ^_^;;
> OTOH on one of those *I* don't know what to do with all of those addressing
> modes... :-)
> Or, I guess, you could conceivably look at that page zero stuff as
> "registers". Is there any standardization for how those are used at all?
Not much. Although Microsoft BASIC-based 6502 microcomputers (Apple II and
most Commodores, for example) have some similarities in their zero page usage,
they don't have much in common, and 6502-systems that aren't Microsoft BASIC
based (Ataris, etc.) look totally different.
Even between Commodores this usage changed, sometimes radically.
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Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com
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