Jim, I almost got confused and thought I was reading the coco mailing list. Lol this is quite interesting. On Wed, May 23, 2018, 2:11 AM Jim Brain <brain@jbrain.com> wrote: > Ruud: > > In reference to this old posting: > > http://www.softwolves.com/arkiv/cbm-hackers/13/13116.html > > I thought I'd note that I designed a C64 cartridge containing a MC6809 and > some RAM. I know it's not exactly the same as your idea, but it is easier > to prototype. > > > https://www.facebook.com/go4retro/photos/a.386509271508869.1073741826.386509238175539/984731561686634/?type=3&theater > > The initial goal is to multiplex the two CPUs, allowing the 6809 to access > some shared RAM on the low PHI2 portion of the cycle, and 64 access on the > high portion. Then, I'll try to speed up the 6809 to 4MHz and see if I can > keep the shared memory in place. > > Possibly later, I'll see if I can have the 6809 take over the bus like > SuperCPU and Chameleon64, but I suspect I have to learn quite a bit more > about the system bus. > > Jim > > -- > Jim Brainbrain@jbrain.com www.jbrain.com > >Received on 2018-05-23 16:00:43
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