On Tue, 17 Aug 1999, MkII wrote:
> >This looks great on the monochrome spanish games such as
> >"Batman", even better than a real MSX in some cases.
> Also, different TVs yield different picture qualities, perhaps even better
> than BrMSX with the best of interpolations.
This non-linear filter described before is not interpolation, it's
actually "reconstruction". Think of it as a sampled signal. The original
signal was heavily undersampled (below Nyquist's limit), and, because of
that, part of the signal is LOST. What I tried to do was getting the
original signal, by using a prediction algorithm in the sampled signal.
This is something that the conventional TVs cannot do.
Example: if BrMSX finds this kind of pattern:
#
##
###
####
#####
... it will change it into:
\
#\
##\
###\
####\
As you can see, this is not the simple interpolation performed by
the circuitry of the TV. The engine used in "Parrot" is quite nice, but
I have something better now. If you have a fast PC, download my other
emulator "BrSMS" and use the "2xSaI" engine to see an incredible
reconstruction! (BrSMS can emulate the Colecovision so you can play
our Antartic Adventure in the 2xSaI engine).
> What would be the next step in BrMSX emulation accuracy?
Bozo emulation. Here in Brazil the computers could be connected in
channel 3 or channel 4. Channel 3 is not used in broadcasting, so when you
turn off the computer, all you see is noise. This is already emulated.
However, when you change to channel 4, you can see the "SBT" channel,
which used to present the brazilian version of the clown "Bozo". I'll add
that as soon as I get the Bozo soundtrack (and that's really hard to
find...)
The one other thing I want to add is the "processing noise" of the
brazilian Expert. This machine has a heavy flaw in its design: the sound
that comes out of the PSG pass through a copper track that is parallel to
the data bus. Due to the electromagnetic interference, you can hear in the
speakers what the computer is doing. These noises are deterministic and
here in Brazil everyone can tell what the computer is doing even if the
computer is not connected to a TV. Andre Delavy told me he used this noise
to fix broken machines - he says he knows the noise produced by each of
the common bugs in the hardware.
> Don't misunderstand me. I love emulation theory.
Me too. I did study a lot of Cognitive Science before starting
BrMSX. You people should try the great book "Godel, Escher, Bach" from
Douglas Hofstadter. It has in-depth explanations of the basis of
Cognitive Science, which includes human brain emulation. You can
buy it from www.amazon.com.
> NB: emulators are not a guarantee of survival for the MSX system just like
> cyborgs are not a guarantee of survival for the human race.
I agree with that. I never said the emulators can save the MSX.
However, I do think of emulators as good "marketing tool", something like
"a trial version" of the real thing. Enjoy the emulator - and if you
really like it, buy the original one.
----------------------------------------------------------------
Ricardo Bittencourt http://www.lsi.usp.br/~ricardo
[EMAIL PROTECTED] "Ricardo is subtle, but malicious he is not"
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