Wiki editing discussion

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By Grauw

Ascended (9687)

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31-12-2020, 02:19

gdx wrote:
Grauw wrote:
Grauw wrote:

On the PSG wiki page I added a table of machines which output stereo. For a number of machines the balancing is known (looked up in openMSX source), which I’ve extrapolated to the other machines of the same brand. For other machines the channel balance is not known, so it would be nice if this could be determined.

Next, I noticed the National FS-5500F1 and National_FS-5500F2 pages claim these machines support stereo PSG output, however their chipset is listed as the Yamaha S3527 (evidence), which only outputs mono. These superimposing machines have stereo inputs, so I think only those are output in stereo and the PSG is mono. I think we should remove the stereo PSG sound from the description.

The National FS-5000 also claims it’s stereo, but this one actually has a stereo/mono switch on the back and does not have any audio inputs. The chipset is listed as “Probably Yamaha S3527 or Yamaha S1985”. If this machine is indeed stereo as the presence of the switch would suggest, then the chipset must be the Yamaha S1985 or else a discrete PSG or Toshiba engine.

Lastly the Sony HB-F900 page also says it’s stereo, however the main unit only has a single mono output. Perhaps a stereo signal is sent to the HBI-F900 AV unit, I can’t determine this absent a service manual, but it would be nice to confirm.

About the National FS-5500F1/2, since Quibus replied “This is like the 8280. PSG is mono, despite stereo output.” and nobody contested, I removed them from the stereo section of the PSG wiki, as well as the mentions of stereo PSG on their respective pages.

MSXs of this kind have a stereo output for the signal coming from the external video. The sound output of the MSX remains mono.

The 1ch-2ch CHANNEL switch seen on the back of the National FS-5500F1 refers to the RF output (the National FS-5000 has both), maybe that’s where the confusion came from.

By gdx

Enlighted (4192)

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31-12-2020, 01:57

Yes there is no stereo/mono switch.

Only switches for 1ch-2ch channel, enable/disable the firmware and Kana/JIS keyboard.

By Grauw

Ascended (9687)

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31-12-2020, 02:20

Since the National FS-5000 has stereo if we’re going by the switch on the back, but its wiki page said the engine was “Probably Yamaha S3527 or Yamaha S1985”, I’ve changed that to “Probably Yamaha S1985”. Still not conclusive, and still would like this to be confirmed and to know the panning.

In the stereo section of the PSG wiki I’ve entered its panning as Center / Left / Right on the presumption of it having an S1985 and being wired up correctly.

By gdx

Enlighted (4192)

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31-12-2020, 02:15

The FS-5000 has a stereo/mono switch.

By Grauw

Ascended (9687)

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31-12-2020, 02:18

I have not claimed otherwise Smile.

By gdx

Enlighted (4192)

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31-12-2020, 02:21

I know. The confusion may have come from there.

By Grauw

Ascended (9687)

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31-12-2020, 02:22

Yeah!

By Grauw

Ascended (9687)

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31-12-2020, 03:45

Grauw wrote:

Lastly the Sony HB-F900 page also says it’s stereo, however the main unit only has a single mono output. Perhaps a stereo signal is sent to the HBI-F900 AV unit, I can’t determine this absent a service manual, but it would be nice to confirm.

The Sony HB-F900 flyer has a diagram on page 11 which tells us the superimpose unit’s audio input from the computer is monaural (モノラル). So I’ve removed mention of the Sony HB-F900 having stereo PSG from the corresponding wiki pages.

And, according to Takamichi:

Takamichi wrote:

CPC-400 does not split PSG to R and L channels but splits PSG to one and SCC to the other. If there is no SCC you hear the same sound from both channels regardless of the switch condition. I haven't tried SCC and FM or other sound module at the same time. This person knows more details. The idea might had been similar to that FM-MUSIC + MSX AUDIO "MSX stereo".

So I’ve also removed the CPC-400 and CPC-400S from the stereo PSG listing and updated their wiki pages.

By Manuel

Ascended (17692)

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06-01-2021, 10:16

Hmm, PHC-33 says no chipset, but on the picture of the main board we clearly see S3527. Am I missing something?

By mars2000you

Enlighted (5823)

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06-01-2021, 10:57

Ehmmm .... I can't find where you see the S3527....

Edit: ah, it's on the other side of the PCB....

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