Re: about "penny lane.prg" on vic 20

I have a NTSC vic 20  if fact what looks strange is not so the frequency 
of the notes but rather the sequencement.
It looks like from time to time the not is slightly late or early.

I try to contact the author of the french version to see if he still has 
a copy.

--
didier

On 11/05/2015 09:05, Anders Carlsson wrote:
> Marko Mäkelä wrote:
>
>> f(n)=f0*2^(n/12) where n is an integer that identifies the note that 
>> you want to play.
>
> As well as changing the note frequency table, changing the key of the 
> music also makes a difference. I have tried various keys for many of 
> my musics, and believe that my adaption of the Penny Lane tune also 
> was subject to finding the best combination of frequencies and key. To 
> make matters worse, one set of frequencies that sounds OK on PAL will 
> sound awful on NTSC and vice versa, and it is not even given that the 
> same key is playable on both types of computers. For a long while, 
> emulation was also far off (too precise) from the real VIC chip, but 
> later versions of VICE improved the detuned emulation somewhat.
>
> (guess why I eventually invested in a NTSC VIC-20 to have next to my 
> PAL ones)
>
> The source for my music adaption was a listing I found in a Swedish 
> magazine, I think it was Elektronikvärlden's special VIC-20 page in 
> 1983-ish. However I'm totally positive the listing was imported from 
> another source, either a magazine or a PD library, so quite likely the 
> program you remember with black screen contained the same music. There 
> is a such BASIC program on Zimmers FTP, but I can't say for sure it 
> exactly matches the listing in my magazine.
>
> I suppose Didier's VIC to be a PAL one (never heard of SECAM VIC-20's 
> anyway). If it by chance is a NTSC one or his VICE emulator is set to 
> NTSC mode, that is a definite reason why the BASIC program sounds 
> awful, assuming the frequencies used are intended for a PAL machine. 
> It could be worth double checking.
>
> Best regards
>
> Anders Carlsson
>
>
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