Re: Hardware emulation of 6509 using 6502?

From: Dr Jefyll <laughton_at_cyg.net>
Date: Sat, 24 Feb 2018 20:19:15 -0700 (MST)
Message-ID: <1519528755540-0.post@n4.nabble.com>
Dr Jefyll wrote
> We can't have
> read data from memory at $0000 or $0001 /also/ attempting to drive the
> bus.

Huh -- or maybe we CAN!  The question is, are /writes/ to $0000 and $0001
also passed on to RAM? With the present arrangement I think they are. That
means it's OK to have two bus masters later when the read occurs, because
the data will be the same!

But is the present arrangement acceptable? I heard some discussion somewhere
about writes to $0000 and $0001 /not/ being passed on to RAM. Is that a
desirable thing? Here's where my lack of CBM knowledge becomes apparent...  
:o/

cheers,
J



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