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SCC output

By Eugeny_Brychkov

Champion (457)

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16-01-2012, 16:42

Hi guys, anyone knows how SCC output is formed?
I think that each channel data is added with 80h (to have waveform center in the middle of voltage scale), then all are summed (c1+c2+c3+c4+c5) resulting in maximal value of 4FBh on 11 output lines. Is my assumption correct? Thanks.

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By Eugeny_Brychkov

Champion (457)

Eugeny_Brychkov's picture

16-01-2012, 17:47

And is SCC output volume (i.e. digital value) normalized, or linear?

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By wouter_

Master (142)

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16-01-2012, 18:32

Almost, you're forgetting about the volume scaling. So the range of possible values is only [40 .. 1235]. Jon De Schrijder once measured it on real HW. See the comments at the top of the SCC implementation in openMSX (lines 5-32) for details.
   http://openmsx.svn.sourceforge.net/viewvc/openmsx/openmsx/tr...

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