Re: Hardware emulation of 6509 using 6502?

From: Jim Brain <>
Date: Fri, 20 Jul 2018 12:47:28 -0500
Message-ID: <>
On 7/19/2018 3:23 PM, Mia Magnusson wrote:
> Btw I know I'm feature creeping, but how hard would it be to add a mode
> where the video ram from bank 15 is seen at $8000, the rest is ram and
> some way of exiting that mode by accessing some address that is an I/O
> space of the original PETs? That way it would probably be rather easy
> to emulate a PET good enough to run most PET software.
It might be trivial, but I need to understand it better.  Can you 
provide more specifics?:

  * 00:8000-00:???? should actually access 15:????-15:????
  * Anything else needing mapped?

I have a few macrocells left in the CPLD, so I can try.

Received on 2018-07-20 20:02:34

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