cool.. thnx guys.!
8bits is exactly as i thought (heared). :).
!.expect some new -loads of chanels- scc music in the future!.,
.. scc symphony .. hehe
greets.
aka!.,
Alex Wulms wrote:
> ] Wulms,
> ]
> ] I'm asking you cause i'm sure you know this :)
> ]
> ] I'm working on a scc emulator on the Clavia Nord Modular.
> ] I already made a psg and fm-pac so scc is the next logical thing :)
> ]
> ] Now I don't know what the data format is for the wave data.
> ] As far as i remember it was 32 bytes long, but is every byte a sample?.
> The wave data is 32 bytes long indeed. Every byte is an 8-bit unsigned sample
> value.
> Two examples to illustrate.
> To make a perfect square wave:
> 0 0 0 0 0 0 0 0 255 255 255 255 255 255 255 255
> To make a nice sine wave:
> for x = 0 to 31
> wave[x] = 128 + 127 * sin(x * 2 * PI / 32)
> next x
>
> Please note that the frequency number in the frequency registers of the SCC
> is exactly 1 higher or lower then the frequency number in the frequency
> registers of the PSG. I do not know anymore if it is 1 higher or one lower.
> But the difference is exactly 1.
> With other words, to calculate real frequency from frequency registers value:
> On PSG: 111861/(register value)
> On SCC: 111861/(register value + 1) or 111861/(register value - 1)
> Although the difference in frequency is very small when not implemented
> correctly, the difference can become very audible due to interference between
> PSG and SCC channels.
>
> Another thing to take into consideration:
> On normal SCC:
> Channel 1, 2 and 3 each have an individual wave
> Channel 4 and 5 share the 4th wave
> On the SCC+ (delivered with Snather/SD-Snatcher):
> Each channel has an individual wave
> The SCC+ listens to other addresses then the SCC
>
> Kind regards,
> Alex Wulms
>
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