On Thursday 21 January 2016, 21:11:12 silverdr@wfmh.org.pl wrote: > > 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. using the DMA line (which halts the internal CPU and removes it from the bus) -- http://www.hitmen-console.org http://magicdisk.untergrund.net http://www.pokefinder.org http://ar.pokefinder.org The best thing I did with my amiga, was probably to give it away :) <Jeff/Camelot> Message was sent through the cbm-hackers mailing listReceived on 2016-01-21 21:00:54
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