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#1 2013-09-10 11:30:12

DjFluorescent
Space Invader
From: Texas,USA
Registered: 2010-01-16
Posts: 136

MSSIAH is Missing Pulse Width Values

So I was SIDDUMPing some tunes today and also studying a SID register reference table when I discovered something interesting. The pulse width parameter has a range of 000-FFF with 800 being 50% duty cycle. But why when I look in the sequencers instrument page do I see only 32 values for the duty cycle? What gives? why does MSSIAH's pulse width 28 = hex pulse width 800, and why can't I play with very very thin pulses without resorting to modulation?  I don't want a modulated sound, but I DO want a very thin pulse to emulate a highpass filter sound. I don't see any reason on the face of things that explain such a restriction.


**** COMMODORE 64 BASIC V2 ****
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#2 2013-09-11 19:33:16

gravedraq
Gianas Sister
Registered: 2012-09-04
Posts: 26

Re: MSSIAH is Missing Pulse Width Values

DjFluorescent wrote:

So I was SIDDUMPing some tunes today and also studying a SID register reference table when I discovered something interesting. The pulse width parameter has a range of 000-FFF with 800 being 50% duty cycle. But why when I look in the sequencers instrument page do I see only 32 values for the duty cycle? What gives? why does MSSIAH's pulse width 28 = hex pulse width 800, and why can't I play with very very thin pulses without resorting to modulation?  I don't want a modulated sound, but I DO want a very thin pulse to emulate a highpass filter sound. I don't see any reason on the face of things that explain such a restriction.

Uh ho, I would ask such question to the creator instead if i was you big_smile
http://www.8bitventures.com/contact.php

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