Re: Hardware emulation of 6509 using 6502?

Den Thu, 15 Mar 2018 23:02:19 +0100 skrev groepaz@gmx.net:
> Am Donnerstag, 15. März 2018, 22:26:18 CET schrieb Mia Magnusson:
> > Den Thu, 15 Mar 2018 21:50:02 +0100 skrev groepaz@gmx.net:
> > > Am Donnerstag, 15. März 2018, 21:03:37 CET schrieb
> > > 
> > > silverdr@wfmh.org.pl:
> > > > VICE is a different thing, and as smf mentioned, a "100%"
> > > > accurate emulation of all the analogue idiosyncrasies of various
> > > > combinations of VIC/mainboard revisions is close to impossible.
> > > > What we talked about are the perceivable differences of the
> > > > hardware's output. The biggest one (we talk PAL) is between
> > > > 6569R1 and the later revisions. The second biggest is between
> > > > 6569R[2-4] and 8565 (was it? I dislike this VIC so much that I
> > > > am not even sure if this is its proper number :-). The third is
> > > > between the 6569R5 and 8565. If I didn't mix things up and
> > > > differences inherent to various variants of the RF modulator
> > > > aside.
> > > 
> > > its not that impossible really - its just that VICE implements all
> > > that stuff completely in software that runs on the CPU right now,
> > > and with that approach it would simply be way too slow. if try
> > > micro64, which implements this stuff in GPU shaders :)
> > 
> > Come on, it can't be any noticeable amount slower to let blue be
> > blue and not some terrible semi-magenta color :)
> 
> sure - and you can easily "correct" that yourself by tweaking the
> available options.

Wow, finally found it. Thanks!

It's hidden under Settings -> Video Settings ... -> VICII Colors, and
NOT under Settings -> VIC-II Settings. (Notice btw that at one place
it's written VIC-II and at another place VICII).

A bit secret :)

Btw at the Settings -> VIC-II Settings someone has mixed up
RF/Broadcast TV standards with video signal standards. As VICE hardly
emulates RF signals (and if it would, it wouldn't emulate interference
between the video and audio carriers), talking about PAL-G is a bit
wrong as the same VIC-II chips were used in the PAL-I versions for UK,
and if Commodore would had made any C64 for the former eastern block it
would had been the same chip but a PAL-K RF modulator.

I think more correct terms for that drop down would be PAL, NTSC,
Old NTSC, PAL-60 (Brazil).

Afaik Brazil is the only country which actually used PAL-60 (which
isn't the same as the PAL-60 that many DVD players and set top boxes
can produce, those are PAL-60-4.43 while Brazil used PAL-60-3.58 (same
color subcarrier frequency as NTSC, which actually affects the picture
quality if Vice wants to emulate the blurriness of composite video)).

> this red-ish blue btw is a "feature" of certain C64s - the default
> VICE output looks *exactly* like my C64 connected to a 1701 for that
> matter.

I have faint memories from the 80's that my C64 indeed looked that way.

But I've never seen a PAL C128 that looks that way, still VICE defaults
to that color.

The really redish blue actually makes me a bit sick. (For real, not
just that I think it's ugly or so but I get a faint bit of the same
feeling as you get if you have ingested something poisonous or got hit
in the head). :)

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