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From: Csabo (all posts)
Date: 2000-08-01
Subject: Sound and $0300 blah blah

Hi All!

While developing the music player for our upcoming demo, I have made a few observations. Listen to the attached silly examples. Start them with G1100.

1) In WinEMU there is almost no audible difference between sound volumes
4-8. (?)

2) This made me wonder. If the lower 4 bits of $FF11 are used for the volume, what would have happened on the real Plus4 if we used 9 or higher?
What's the deal with 9 levels of volume anyway? Eight levels (0-7) would give us 3 bits digi, but if it was 4 bits, then we should have sixteen
(0-$F) levels of volume.

3) Minus4 completely ignores the volume. See the example. Right?

4) Minus4 completely ignores the frequency of noise. It always outputs the same high pitched noise, regardless of $FF0F and $FF10. See the example.
Right?

5) The only difference between the two examples is that in the second one,
the freq table is at $0300. While WinEMU plays it perfectly, something goes wrong with Minus4. What's on the $0300 area? I figured we should be able to use it as regular RAM, right?

6) Lidovski's Plus4 emulator won't play sound on my machine (I've got a crappy soundcard). Wonder how this stuff sounds on it... BTW, did anyone ever contact this guy? Does his emulator have a real homepage?

Take care,

Csabo of LOD

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