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About Synthpopalooza

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    knoxville, TN
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    Atari and Amiga computers, Doctor Who, science fiction, 1980's electronic and new wave music

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  1. The other point to keep in mind: current emulations (Prosystem, JS780O, A7800) are fine in cases where either the standard 64khz clock is used (AUDCTL=$00, all distortions), 16-bit plus 1.79 on $Ax distortion, or when using 15khz clock on $Ax distortion (bit 1 of AUDCTL). Other settings cause issues, of differing results depending on emulator.
  2. The other test case: Bently Bear. This one uses only $Ax distortions. In this case we want to test the title and level complete music here, as these use 16-bit.
  3. No special SKCTL settings. From memory, here's what's being used: Have You Played Atari Today? - AUDCTL=$50. The first two channels are joined using 16-bit and clocked at 1.79 mhz, using $Cx saw wave distortion, mod 3 frequencies Title music: AUDCTL=$70. 16-bit again using $Ax square wave, third channel at 1.79 using $Cx distortion Area 1 theme: AUDCTL=$71 ... 16-bIT channel again at $Cx distortion, 3rd channel $Cx at 1.79, and square wave $Ax at 15 khz (bass frequencies) Area 2 - AUDCTL=$70 ... same as title except using $2x distortion on channel 2 Area 3: AUDCTL=$71 ... same as 1 except third channel is distortion $0x percussion Area 4 - AUDCTL=$10, Reverse 16-bit (play 1 silence 2) all $Ax distortion Area 5: Can't remember offhand, but it uses hi pass filter and 15khz The rest I will need to look up ... if I could hear audio recordings I can nail down what is happening.
  4. So, technical question: How did you get the flickering font effect? Was that a Antic 2/4 interlace, or did it involve PMG overlays?
  5. A good test case is the Milly and Molly 7800 game. It uses some advanced and undocumented modes (not two tone) and would be interesting to see how HOKEY handles them.
  6. How does it do on my stuff? 😉 Seriously, though, this is awesome. Liking it.
  7. Homesoft has fixed it. New version is on their site
  8. There is a slight bug in the Atari8 port ... the timing code in the music didn't make the transition, and as a result, plays slower in PAL ... it should play the same tempo in both PAL and NTSC. Anybody have the source of the Atari8 port? I can look it over and see what got lost.
  9. One thing I always found interesting, and I have a theory for it: Those settings on 4 distortion 1.79 using two tone filter, but mod 15 values starting with $0B. It makes standard C distortion (set from second channel) but increases fuzziness as you step up channel 1 by 15. I think it's because the silence randomly samples all 0's or all 1's, and these get differentiated in the output. The lower the frequency the more present this is. Am I right here? And in 15khz mode, a bass table made up of only buzzy (not gritty) tones replaces the normal C bass. Wonder why that's different?
  10. There are other setups that allow extra RAM, including the 512k bankram, and the XM 128K RAM setup which I believe is accessible on Dragonfly.
  11. One caution: If you use the 3rd octave and up ... silence the 2nd channel, or it will intermittently not play.
  12. There's LZSS, which is currently being used in an Atari 8 project I am working on. Will investigate.
  13. So, I am going to tag in @phaeron here ... do you have a documentation on 2-tone mode and how it works? I understand part of it ... like the frequency in the first channel must be higher than in the second, and the second channel carries the frequency, modulated by the first. I have it kind of figured out with A distortion, but I am slogging my way through 4 distortion at 1.79 (with both 15 and 64khz) and it's slow going, mainly because of all the mod 3/5/15/31/non mod combinations. I want to understand how the modulation works. Example: I know the hi-pass filter uses an XOR gate on the sampled bits, or in the case of A distortion, the square pulses. How exactly are the squares and sampled bits handled in the 4 distortion ... specifically, for example, in those instances where you get the mod 15 frequencies starting at 11 decimal (11, 26, 41, etc.) and it makes the C distortion sound with fuzz ... or why the same setting in 15 khz makes stable tones with no mod 3's apparent. If I can better understand how it all works, it might make this all go a lot faster.
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