Re: SuperCPU for my C64 and C128

Hi Baltissen,

Thanks for sharing. My first roadmap it's to develop my prototype in
development platform and lateral try to design a custom board. Also, i have
considered to implement the prototype in the U2+ and then, to allow the
community to reuse the hardware bought already for them (this is a
possibility but first let me see to achieve the project  hahaha). Right
now, i don't have a U2+, i'm seeking to get one from Gideon with a safe
shipping service because the postal service in my country is awful.

Cheers,
Luis Vela
dsp8bit

El jue., 19 de jul. de 2018 1:13 AM, Baltissen, GJPAA (Ruud) <
ruud.baltissen@apg.nl> escribió:

> Hallo Luis,
>
>
> > how is the signaling exchange between the C64 and the SCPU
>
> The SuperCPU disables the 6510 and takes over the C64. I don't know
> exactly how but this page has info on the CP/M card for the C64:
>
>     http://baltissen.org/newhtm/c64_cpm.htm
>
> It includes a schematic and should give you an idea how the 6510 can be
> stopped and put in tri-state and how the a-synchronous Z80 handles the
> transfer of data between itself and the C64. This could be a starter for a
> simple design where the 65816 just runs at 1 MHz and does nothing else than
> replacing the 6510. Next step could be to make the 65816 run at an odd
> frequency like 5Mhz just to make sure that the synchronization works. Then
> it is adding RAM, ROM and I/O to the design.
>
> When I bought the 1541Ultimate one of the ideas was to use as a
> development platform as well. Particularly I had the SCPU in mind. But I
> soon found out it was way above my head: no FPGA knowledge :( But I thought
> that what I could not, maybe others could. So I convinced Gideon to make
> the Ultimate open source. Maybe something for you?
>
> Regarding my FPGA knowledge: I bought a Godil and did some small projects
> with it. But it convinced me that the Ultimate is still out of my league
> yet :(
>
> Good luck and have fun!
>
>
> Met vriendelijke groet / With kind regards, Ruud Baltissen
>
> www.Baltissen.org
>
>
>
>
>
>
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