Re: Hardware emulation of 6509 using 6502?

From: silverdr_at_wfmh.org.pl
Date: Thu, 15 Mar 2018 15:13:53 +0100
Message-Id: <07784E15-53F7-40BA-B66B-9D67D0524689@wfmh.org.pl>
> On 2018-03-15, at 14:24, Segher Boessenkool <segher@kernel.crashing.org> wrote:
> 
> The 65xx SID has highly non-linear "opamps".  The 85xx fixes that.
> Not everyone likes it, of course.

It fixes also the bad clicks during volume change for example. Or is it the side-effect of the above?

> On later C64 machines the CS line to VIC goes active earlier,

Is it because they inaccurately emulate the original PLA in a completely different chip?

> causing
> the sparkles.  A little cap (from CS to ground) solves this.  There is
> no difference between the 65xx and 85xx VIC here.

Even sparking aside, the picture is noticeably different. I don't say "better" or "worse" but it is different.

-- 
SD!
Received on 2018-03-15 16:03:59

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