Date   : Tue, 31 Jan 2017 14:53:58 +0000
From   : djameson@... (Daniel Jameson)
Subject: Pi-based second processor - fast, flexible,

Speed is notional, benchmarked with clocksp (relative to bbc basic II on a
beeb, calibrated at 2MHz).

Runs on bare metal. Some of the emulation is handled in the GPU IIRC...

d.

On 31 Jan 2017 14:26, "John Kortink" <kortink@...> wrote:

>
> On Tue, 31 Jan 2017 13:18:39 +0000, Ed Spittles <percy.p.person@...>
> wrote:
>
> >[...]
> >
> >The project home page is
> >https://github.com/hoglet67/PiTubeDirect/wiki
> >
> >The Pi can run as a 6502 model running at 3MHz or 274MHz equivalent, a Z80
> >at 60MHz, an 80286, a 6809, an ARM2 (at about 9MHz equivalent), a 32016,
> or
> >a gigahertz ARM7. You can choose which one it boots as, or switch using a
> >*FX command.
> >
> >[...]
>
> It's an interesting project for sure, and a lot of work.
>
> I'm curious however. How was the 274 MHz figure achieved and
> calculated ? I can't find any satisfactory explanation for it
> on the web page you point to. It seems rather high for a mere
> simulation running on a 1 GHz processor, more so since the
> Z80 then seems to lag way behind at 60 MHz.
>
> Just curious.
>
>
> John Kortink
>
>
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