VOGONS


Broken SCC-1?

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First post, by Tempus

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Hello.

I have a Roland SCC-1 that sounds strange. The Demo Songs should sound like this: https://www.youtube.com/watch?v=365XkGuTod4

My SCC-1 on the other hand sounds like this: https://1drv.ms/u/s!AtxQRLkK3W0N5yRfz_rigy0pR5zn?e=XrhSFC

Anyone know what problem this is?

Akumajo Dracula: Belmont's Theme Roland MT-32 | Yamaha YM2151

Reply 2 of 13, by Thermalwrong

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It sounds like some of the voices aren't being played, or they're being cut off?
I'm not familiar with the SCC-1 beyond being aware that it's an SC-55 + MPU401 on the same card.

It looks like it's got 4 ROM modules, maybe one of those has some trouble, or there's a damaged trace / bad solder joint on there? It might be useful to post pictures of the card itself too.

Reply 4 of 13, by cyclone3d

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What are the specifications of the system you are using it in?

What power supply are you using? Have you tried a different, verified properly working power supply?

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Reply 5 of 13, by Tempus

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I am using a Cooler Master V550. I haven't tried another one though. I have tried the card in different ports on two entirely different motherboards though, one Pentium 200MMX and one 486DX2 66 computer, but both with the same power-supply.

Akumajo Dracula: Belmont's Theme Roland MT-32 | Yamaha YM2151

Reply 6 of 13, by cyclone3d

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Have you tried with a known properly working power supply yet?

Yamaha modified setupds and drivers
Yamaha XG repository
YMF7x4 Guide
Aopen AW744L II SB-LINK

Reply 8 of 13, by cyclone3d

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pentiumspeed wrote on 2020-07-22, 18:44:

Need -5V, if you using modern ATX, this is missing -5V. Check your power supply label.

Cheers,

Does it? I thought that may be the case but I couldn't find any reference to the SCC-1 needing -5V... just the LAPC-I. If so, it needs to be added to the list in the post below.
ISA Cards & Devices Requiring -5V

Now I need to pull my SCC-1 out of the computer it is in and test it in a computer that doesn't have -5v.

Yamaha modified setupds and drivers
Yamaha XG repository
YMF7x4 Guide
Aopen AW744L II SB-LINK

Reply 9 of 13, by keropi

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no it doesn't, pin B5 is not present on the edge connector

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(photo stolen from Batyra's site... 😀 )

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Reply 11 of 13, by Tiido

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Wrong sounds indicate problem with the sound chip (the biggest one on the board), or stuff connected to it. I would look closely at sample ROMs, the photos shown of the top of the board don't seem to show any issues but there might be a damaged trace on other side of the board...

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