Re: Hardware emulation of 6509 using 6502?

From: Michał Pleban <*lists_at_michau.name*> Date: Sat, 24 Feb 2018 20:17:47 +0100 Message-ID: <5A91BA5B.9010405@michau.name> · lists_at_michau.name

Hello!

Dr Jefyll wrote:

> But if page crossings are allowed then things
> get harder, because when cycle 6 arrives it might be the data access or it
> might be the opcode fetch of the next instruction.  We need to know whether
> or not to flip to P3-P0 flip back to their previous state --  and there
> can't be any mistake about this!  So, what I'm saying is: allowing page
> crossings on cross-bank accesses requires extra resources.

If I remember correctly from my experiments with the 6509 IPC code, it
DOES allow page crossings.

Regards,
Michau.

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