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Creative CT2770 - What are these jumpers for?

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First post, by appiah4

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I just grabbed a Creative CT2770 to add to my SB16 collection. There are some jumpers on this card that I do not know what purpose they serve. I am hoping some of them may be line out or line in headers to make it possible to use this as a simple OPL3/SB16 companion card to a PCI one. Does anyone know what the marked headers are for?

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Retronautics: A digital gallery of my retro computers, hardware and projects.

Reply 1 of 4, by th1r5bvn23

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I actually have the original manual for my CT2770, however, it didn't mention these jumpers (JP16, JP17 and JP18). A quick google showed that these jumpers are undefined and set by factory. On my card though, the JP17 is set connected.

AMD K6-2+ 500, FIC PA-2013 2.0 (1MB cache), 128MB SDRAM PC100, Voodoo3 3000 AGP, Labway Yamaha YMF719B-S with NEC XR385
AMD Athlon 64 3000+, ECS K8M800-M3, 512MB DDR 400, GeForce FX 5200, SoundBlaster Live! SB0060

Reply 2 of 4, by appiah4

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th1r5bvn23 wrote:

I actually have the original manual for my CT2770, however, it didn't mention these jumpers (JP16, JP17 and JP18). A quick google showed that these jumpers are undefined and set by factory. On my card though, the JP17 is set connected.

I am thinking that JP17 actually connects line out to the card's port, so it may be possible to get line out from that header.. I will test that theory out once I get the card. If anyone has it, can you please check?

Retronautics: A digital gallery of my retro computers, hardware and projects.

Reply 3 of 4, by th1r5bvn23

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appiah4 wrote:

I am thinking that JP17 actually connects line out to the card's port, so it may be possible to get line out from that header.. I will test that theory out once I get the card. If anyone has it, can you please check?

I found this post and it seems that JP16 and JP17 are line out. JP16 pin 2 to 5 seemed to match with pin 5 to 8 in the post. Judging by the location of JP18, I might guess that JP18 matches pin 1 to 3 in the post, and JP16 matches pin 4 to 8 in the post. So does JP17.
I also noticed that in the manual, JP16 and JP17 pin 3-4 are connected.

AMD K6-2+ 500, FIC PA-2013 2.0 (1MB cache), 128MB SDRAM PC100, Voodoo3 3000 AGP, Labway Yamaha YMF719B-S with NEC XR385
AMD Athlon 64 3000+, ECS K8M800-M3, 512MB DDR 400, GeForce FX 5200, SoundBlaster Live! SB0060

Reply 4 of 4, by appiah4

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th1r5bvn23 wrote:
appiah4 wrote:

I am thinking that JP17 actually connects line out to the card's port, so it may be possible to get line out from that header.. I will test that theory out once I get the card. If anyone has it, can you please check?

I found this post and it seems that JP16 and JP17 are line out. JP16 pin 2 to 5 seemed to match with pin 5 to 8 in the post. Judging by the location of JP18, I might guess that JP18 matches pin 1 to 3 in the post, and JP16 matches pin 4 to 8 in the post. So does JP17.
I also noticed that in the manual, JP16 and JP17 pin 3-4 are connected.

Ahh, so they basically split the old CT1600 AUDIO_PWD header into two: JP18 is 1-3 (GND/GND/MIC) and JP16 is 4-8 (GBD/SPR/SPL/SPL+/SPRR).
That means if you remove the jumper and use JP16 pins 1,2 and 3 you can get audio out from this card internally to route its OPL3 output to another card, possibly a card with onboard wavetable or a PCI card with cleaner PCM.
Fantastic.

Retronautics: A digital gallery of my retro computers, hardware and projects.

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