Running old school games on your PSP? It's definitely possible
#420946 by robson.santana
Sun Dec 03, 2017 5:20 pm
Oldvic wrote:1. If you choose any 'Sound Quality' below '44100', the sound will randomly distort quite a few times a minute. This is a problem because I often choose '22050hz' for Virtua Racing and Sega CD/Mega CD games to gain some extra FPS. But now it is impossible because of the distortion. By the way, this distortion only appears with NTSC games (all of them). PAL games work fine with any 'Sound Quality' setting. This problem only appeared in v1.92, v1.91 works fine.


Someone would have to test the mono sound in version 1.91 for a device other than the PSP?

If the yamaha chip is disabled the sound is correct for any frequency. This helps in correcting.
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#420947 by Oldvic
Sun Dec 03, 2017 7:41 pm
robson.santana wrote:
Oldvic wrote:1. If you choose any 'Sound Quality' below '44100', the sound will randomly distort quite a few times a minute. This is a problem because I often choose '22050hz' for Virtua Racing and Sega CD/Mega CD games to gain some extra FPS. But now it is impossible because of the distortion. By the way, this distortion only appears with NTSC games (all of them). PAL games work fine with any 'Sound Quality' setting. This problem only appeared in v1.92, v1.91 works fine.


Someone would have to test the mono sound in version 1.91 for a device other than the PSP?

If the yamaha chip is disabled the sound is correct for any frequency. This helps in correcting.

I have tested '22050hz' Mono sound in v1.91 on a GP2X and it works fine.
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#420950 by robson.santana
Mon Dec 04, 2017 12:48 am
Oldvic wrote:1. If you choose any 'Sound Quality' below '44100', the sound will randomly distort quite a few times a minute. This is a problem because I often choose '22050hz' for Virtua Racing and Sega CD/Mega CD games to gain some extra FPS. But now it is impossible because of the distortion. By the way, this distortion only appears with NTSC games (all of them). PAL games work fine with any 'Sound Quality' setting. This problem only appeared in v1.92, v1.91 works fine.


I'm close to spotting the problem. My intuition said that a recent sample was merging with an old sample in memory, and it looks like it is. When I ran a game with 22khz frequency, I triggered the following error

Image
#420956 by Oldvic
Mon Dec 04, 2017 9:35 pm
robson.santana wrote:
Oldvic wrote:1. If you choose any 'Sound Quality' below '44100', the sound will randomly distort quite a few times a minute. This is a problem because I often choose '22050hz' for Virtua Racing and Sega CD/Mega CD games to gain some extra FPS. But now it is impossible because of the distortion. By the way, this distortion only appears with NTSC games (all of them). PAL games work fine with any 'Sound Quality' setting. This problem only appeared in v1.92, v1.91 works fine.


I'm close to spotting the problem. My intuition said that a recent sample was merging with an old sample in memory, and it looks like it is. When I ran a game with 22khz frequency, I triggered the following error

Image

Nice find Robson. I know Notaz made some sound changes in v1.92 to fix the broken sound in Cave Story in Arm, but I don't think there was ever a problem with Cave Story sound on the PSP.
#420970 by hardtecnica
Thu Dec 07, 2017 1:07 am
robson.santana wrote:The source code: https://github.com/robson-alcantara/picodrive
After the SVP dynarec, i will fix the sega cd sound


Robson, vou testar sua versão do Picodrive, mas gostaria de lhe pedir algo, poderia por favor portar este emulador para o PS2 ou melhorar o que já temos nele? Atualmente o PS2 conta com a versão 1.51b portada do PSP, porém apesar de ter um ótimo desempenho alguns jogos são incompatíveis e o som embola frequentemente, resolvendo ao chamar o menu pelo select. Se puder se voltar também para a cena ps2 teremos um "mega" quase que perfeito, barato e com RGB nativo sem precisar de modificações.

I'll test your PSP version. But I ask you one thing, could you please port that version to PS2 or improve the one existent? PS2 have the 1.51b available, besides its a good emulator ported from the PSP version it still have some problems with compatibility and sound sometimes go crazy, which is solved by calling the menu with select. If you could please take a look and improve the PS2 scene with a better picodrive version we could have an cheap genesis with RGB natively.

Regards.
#420971 by robson.santana
Thu Dec 07, 2017 1:57 am
hardtecnica wrote:
robson.santana wrote:The source code: https://github.com/robson-alcantara/picodrive
After the SVP dynarec, i will fix the sega cd sound


Robson, vou testar sua versão do Picodrive, mas gostaria de lhe pedir algo, poderia por favor portar este emulador para o PS2 ou melhorar o que já temos nele? Atualmente o PS2 conta com a versão 1.51b portada do PSP, porém apesar de ter um ótimo desempenho alguns jogos são incompatíveis e o som embola frequentemente, resolvendo ao chamar o menu pelo select. Se puder se voltar também para a cena ps2 teremos um "mega" quase que perfeito, barato e com RGB nativo sem precisar de modificações.

I'll test your PSP version. But I ask you one thing, could you please port that version to PS2 or improve the one existent? PS2 have the 1.51b available, besides its a good emulator ported from the PSP version it still have some problems with compatibility and sound sometimes go crazy, which is solved by calling the menu with select. If you could please take a look and improve the PS2 scene with a better picodrive version we could have an cheap genesis with RGB natively.

Regards.


Oi, o favor de portar para o PS2 não será possível, mas um dos desenvolvedores do port atual entrou em contato comigo e eu dei algumas dicas (https://github.com/fjtrujy/picodrive/), talvez ele se interesse na missão. Também, não tenho um ps2. O problema do som embolar, estou tendo na versão 1.92 (e na versão 1.91 com menor frequência), que também se "resolve" apertando select. Torço para que apareça um port e você possa desfrutar no mais abrangente dos video-games.

Hi, the favor of porting to PS2 will not be possible, but one of the developers of the current port contacted me and I gave some tips (https://github.com/fjtrujy/picodrive/), maybe he is interested in the mission . Also, I do not have a ps2. The problem of sound, I'm having version 1.92 (and version 1.91 less frequently), which also "resolves" by pressing select. I pray for a port to appear and you can enjoy it in the most comprehensive of video games
#420987 by robson.santana
Sat Dec 09, 2017 12:39 pm
Oldvic wrote:
robson.santana wrote:
Oldvic wrote:1. If you choose any 'Sound Quality' below '44100', the sound will randomly distort quite a few times a minute. This is a problem because I often choose '22050hz' for Virtua Racing and Sega CD/Mega CD games to gain some extra FPS. But now it is impossible because of the distortion. By the way, this distortion only appears with NTSC games (all of them). PAL games work fine with any 'Sound Quality' setting. This problem only appeared in v1.92, v1.91 works fine.


I'm close to spotting the problem. My intuition said that a recent sample was merging with an old sample in memory, and it looks like it is. When I ran a game with 22khz frequency, I triggered the following error

Image

Nice find Robson. I know Notaz made some sound changes in v1.92 to fix the broken sound in Cave Story in Arm, but I don't think there was ever a problem with Cave Story sound on the PSP.


fixed

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