Hxx (HF9) makes different sounds on the two 2A03 Pulse Channels

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LunuLeaf
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Joined: Mon Jun 12, 2017 3:01 pm
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Hxx (HF9) makes different sounds on the two 2A03 Pulse Channels

Postby LunuLeaf » Tue Jun 13, 2017 5:29 pm

Hello,

at first I am not sure if there is an existing topic of this, but I found out, that the Hxx-effect makes different sounds in the 2 2A03 Pulse/Square Channels (specifies if you type in "HF9").

I made an example where you can see the differences in the sound between the channels, althought both channels have the same pattern.
I also tested this in FT (0.5) and OCC (0.3.14.5), and in both this bug appears.
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MovieMovies1
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Re: Hxx (HF9) makes different sounds on the two 2A03 Pulse Channels

Postby MovieMovies1 » Tue Jun 13, 2017 5:35 pm

This is not a bug. The hardware sweep units act slightly different between the two channels.
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LunuLeaf
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Joined: Mon Jun 12, 2017 3:01 pm
Location: Germany

Re: Hxx (HF9) makes different sounds on the two 2A03 Pulse Channels

Postby LunuLeaf » Tue Jun 13, 2017 5:42 pm

Oh, I didn't know about that and just thought it would be a bug. Sorry about that.
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Xyz
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Re: Hxx (HF9) makes different sounds on the two 2A03 Pulse Channels

Postby Xyz » Thu Jun 15, 2017 8:15 pm

Well it is a bug, just a hardware bug rather than FT's fault.
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PinoBatch
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Re: Hxx (HF9) makes different sounds on the two 2A03 Pulse Channels

Postby PinoBatch » Sat Feb 17, 2018 12:15 am

In other words, FamiTracker is being bug-for-bug compatible with the known (mis)behavior of the APU sweep unit, as described on NESdev Wiki:
The two pulse channels have their adders' carry inputs wired differently, which produces different results when each channel's change amount is made negative.
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