Re: Microcontroller "PEEKing" into C64 memory?

From: silverdr_at_wfmh.org.pl
Date: Thu, 21 Jan 2016 21:11:12 +0100
Message-Id: <63C9951F-CF8A-4E62-BFE7-71C995086FB9@wfmh.org.pl>
> On 2016-01-21, at 19:56, Jim Brain <brain@jbrain.com> wrote:
> 
> On 1/21/2016 12:32 PM, Per Olofsson wrote:
>> On Thu, Jan 21, 2016, at 05:18 PM, Leif Bloomquist wrote:
>>> Hi all,
>>> 
>>> I have an idea for a project that would require an external
>>> microcontroller to be able to "peek" into parts of the C64 Memory.
>>> 
>>> It wouldn't matter where.  I/O1 and I/O2 might be easiest, but some
>>> unused space like $02A7-$02FF could also work and not interfere with
>>> external devices.   Only would need 8 bytes or so.
>>> 
>>> What would be the easiest way to go about this?
>> If what you need is mirroring of a portion of C64 ram I have a FIFO
>> based bus snooping design that could work, but I haven't had a chance to
>> verify it.
>> 
> I'd also be interested in a design, as I have a few ideas that need such an integration.  I had been planning to implement 8 registers in a CPLD with dual port access, but maybe there are better ways to do this...

How do CPU carts access the RAM? I mean how the external CPUs do it from the EXPANSION port.

-- 
SD!


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