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First post, by Nexxen

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Hello!

I'm almost done with this board, I just can't find the pinout for audio + game bracket.

https://theretroweb.com/motherboards/s/pcchips-m575

It's a C-Media CMI8330 (C3D), but OEM version, HT1869V+
Datasheet is https://www.alsa-project.org/files/files/pub/ … i/8330-spec.pdf

I can probably figure it out but I'd also like to avoid wasting 3 hours on this 😀
Or you can talk me out of it, if it is in my best interest.

Thanks for your time!

Last edited by Nexxen on 2024-06-13, 13:03. Edited 1 time in total.

PC#1 Pentium 233 MMX - 98SE
PC#2 PIII-1Ghz - 98SE/W2K

Reply 1 of 10, by dominusprog

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You should find the pins that are connected to two large caps beside the audio chip for the audio output.

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Reply 2 of 10, by Nexxen

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dominusprog wrote on 2024-06-13, 12:50:

You should find the pins that are connected to two large caps beside the audio chip for the audio output.

Writing about it made me go a step further.
If it a GAME port, signals are the same as for any game header, I should find those with a pinout and hope it does have the same pin numbers.

I'll check that, and I do have an Audio connector to test IN/OUT/MIC.
Speaker Out is the easiest.

PC#1 Pentium 233 MMX - 98SE
PC#2 PIII-1Ghz - 98SE/W2K

Reply 3 of 10, by wbahnassi

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It's J4. I dealt with this a while ago. IIRC the pins closest to the mobo edge are for the gameport. The pins on the inside are the audio ones. I don't know the exact pinout, but I have the audio connector ribbon cable that has 4x2 pins (or was it 5x2?). Anyways connecting it to the pins in the inside gets audio out of the plugs. You can trace the pinout from there.

Reply 4 of 10, by Nexxen

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wbahnassi wrote on 2024-06-13, 13:02:

It's J4. I dealt with this a while ago. IIRC the pins closest to the mobo edge are for the gameport. The pins on the inside are the audio ones. I don't know the exact pinout, but I have the audio connector ribbon cable that has 4x2 pins (or was it 5x2?). Anyways connecting it to the pins in the inside gets audio out of the plugs. You can trace the pinout from there.

Is it any good?
I watched some videos on YT and it doesn't look like it is that worthwhile.
I have better ISA cards to use.

Well, my goal is to have a pinout. It's not gonna be that difficult 😀
Maybe it'll benefit the community.

PC#1 Pentium 233 MMX - 98SE
PC#2 PIII-1Ghz - 98SE/W2K

Reply 5 of 10, by wbahnassi

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It had perfect OPL3 emulation. I couldn't differentiate it from the real deal. Sound quality was generally good too. Digitial SB16 emulation is not very compatible. Many DOS games crash with it. So, a mixed bag...

Reply 6 of 10, by Nexxen

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wbahnassi wrote on 2024-06-13, 13:32:

It had perfect OPL3 emulation. I couldn't differentiate it from the real deal. Sound quality was generally good too. Digitial SB16 emulation is not very compatible. Many DOS games crash with it. So, a mixed bag...

You know what? Being PCChips and after your answer I'm gonna find the pinout but I'm not going down this path as it is clear it isn't a good one.

The board isn't bad though. PCChips... 😀

PC#1 Pentium 233 MMX - 98SE
PC#2 PIII-1Ghz - 98SE/W2K

Reply 7 of 10, by Roman555

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Nexxen wrote on 2024-06-13, 13:22:
Is it any good? I watched some videos on YT and it doesn't look like it is that worthwhile. I have better ISA cards to use. […]
Show full quote

Is it any good?
I watched some videos on YT and it doesn't look like it is that worthwhile.
I have better ISA cards to use.

Well, my goal is to have a pinout. It's not gonna be that difficult 😀
Maybe it'll benefit the community.

Maybe the PCChips M571 connectors have the same pinout.
Check here:
http://m571.com/m571/franczabkar/pinouts.htm

M571 V70A Header Pinouts
  M571 V70A Header Pinouts
------------------------

Game/Midi connector
-------------------

|--|--|--|--|--|--|--|--|
|1 | 2| 3| 4| 5| 6| 7| 8|
Rear of PCB |--|--|--|--|--|--|--|--|
(top view) |9 |10|11|12|13|14|15|NC|
|--|--|--|--|--|--|--|--|
1

The numbers 1-15 represent the pins of the external DB-15S connector.

Pins 1,8,9 are wired to +5V, while pins 4 and 5 are wired to ground.


Microphone and Line In/Out connectors (J6)
------------------------------------------

Mike ring --------|
Mike ground -----| | |--------- Line Out ground
Line In ring--| | | | |------ Line Out ring
| | | | |
|--|--|--|--|--|
| | | | | |
Rear of PCB |--|--|--|--|--|
(top view) | | | | | |
|--|--|--|--|--|
1 | | | | |
| | | | |
Line In tip --| | | | |------ Line Out tip
Line In gnd -----| | |--------- Not connected
Mike tip --------|

tip ring
L R Ground
| | |
| | | ______
__ ____________| |
/ \/ | | | | stereo plug
\__/\_|_|________| |
|__|__

A CM8330 (sound chip) application circuit can be found at:

http://www.cmedia.com.tw/abb4sch.gif

COM1/COM2 connectors
--------------------

|--|--|--|--|--|
|2 |4 |6 |8 |NC|
Rear of PCB |--|--|--|--|--|
(top view) |1 |3 |5 |7 |9 |
|--|--|--|--|--|

The numbers 1-9 represent the pins of the external DB-9P connector.

P.S. One more topic about a similar connector
PCChips M715 (and similar boards) CMI8330 audio pinout?

[ MS6168/PII-350/YMF754/98SE ]
[ 775i65G/E5500/9800Pro/Vortex2/ME ]

Reply 8 of 10, by Nexxen

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Roman555 wrote on 2024-06-13, 13:51:
Maybe the PCChips M571 connectors have the same pinout. Check here: http://m571.com/m571/franczabkar/pinouts.htm […]
Show full quote
Nexxen wrote on 2024-06-13, 13:22:
Is it any good? I watched some videos on YT and it doesn't look like it is that worthwhile. I have better ISA cards to use. […]
Show full quote

Is it any good?
I watched some videos on YT and it doesn't look like it is that worthwhile.
I have better ISA cards to use.

Well, my goal is to have a pinout. It's not gonna be that difficult 😀
Maybe it'll benefit the community.

Maybe the PCChips M571 connectors have the same pinout.
Check here:
http://m571.com/m571/franczabkar/pinouts.htm

M571 V70A Header Pinouts
  M571 V70A Header Pinouts
------------------------

Game/Midi connector
-------------------

|--|--|--|--|--|--|--|--|
|1 | 2| 3| 4| 5| 6| 7| 8|
Rear of PCB |--|--|--|--|--|--|--|--|
(top view) |9 |10|11|12|13|14|15|NC|
|--|--|--|--|--|--|--|--|
1

The numbers 1-15 represent the pins of the external DB-15S connector.

Pins 1,8,9 are wired to +5V, while pins 4 and 5 are wired to ground.


Microphone and Line In/Out connectors (J6)
------------------------------------------

Mike ring --------|
Mike ground -----| | |--------- Line Out ground
Line In ring--| | | | |------ Line Out ring
| | | | |
|--|--|--|--|--|
| | | | | |
Rear of PCB |--|--|--|--|--|
(top view) | | | | | |
|--|--|--|--|--|
1 | | | | |
| | | | |
Line In tip --| | | | |------ Line Out tip
Line In gnd -----| | |--------- Not connected
Mike tip --------|

tip ring
L R Ground
| | |
| | | ______
__ ____________| |
/ \/ | | | | stereo plug
\__/\_|_|________| |
|__|__

A CM8330 (sound chip) application circuit can be found at:

http://www.cmedia.com.tw/abb4sch.gif

COM1/COM2 connectors
--------------------

|--|--|--|--|--|
|2 |4 |6 |8 |NC|
Rear of PCB |--|--|--|--|--|
(top view) |1 |3 |5 |7 |9 |
|--|--|--|--|--|

The numbers 1-9 represent the pins of the external DB-9P connector.

P.S. One more topic about a similar connector
PCChips M715 (and similar boards) CMI8330 audio pinout?

I tried to find what was written on the chip instead of the original name.
(facepalm)

PC#1 Pentium 233 MMX - 98SE
PC#2 PIII-1Ghz - 98SE/W2K

Reply 10 of 10, by Nexxen

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wbahnassi wrote on 2024-06-13, 14:24:

I guess it depends. If you're looking for Win9x gaming, it should be ok. I'm 90% DOS gaming, so it won't cut it for me.

Basically same. I've been looking for a good solution regarding DOS gaming but I can't get past a S7. It's good enough with everything.
64 MB of ram, CFs... I don't need Windows. I recon that many dos games just play in W98/2K.
USB support is there too.

I explored the retro dos 286/386/486 but I like Pentium class speed and versatility.
S.370 is ok, but integrated video+sound isn't dos friendly unless you go after the good baords that now cost a bomb, are sought after and unobtainium.

And emulators. They are good.

It's complicated when you have all the pieces to make choices 🤣

PC#1 Pentium 233 MMX - 98SE
PC#2 PIII-1Ghz - 98SE/W2K