Re: CPU cores

I tried synthesizing this on a 20K gate Altera FPGA a while back and it
didn't fit. However, I am using a stripped down version of MAX+PLUS, so
that may have played a part in it not fitting. It tried partitioning the
design across two devices.

One minor drawback of this CPU is that it is not a cycle for cycle match
of the 6502. Also, I don't think they had BCD math features working at
the time I goofed with it. If I am not mistaken, most games need BCD
arithmetic. This wouldn't be hard to implement though.

Still nice of them to post a core for free...I liked how they had it
running @ 185MHz in some simulations. It'd be cool to play Gravitar like
that :P!

Ed

On Fri, 3 Mar 2000, jeff hendrix wrote:

> I remember a while back we were talking about CPU cores.
>
> I found a free 6502 in VHDL at http://www.free-ip.com/6502/
> as well as some other neat stuff, including a FP coprocessor at
> http://www.opencores.org/
>
> -jeff
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Received on Fri Mar 3 13:06:05 2000