VOGONS


First post, by Nexxen

User metadata
Rank l33t
Rank
l33t

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

"One hates the specialty unobtainium parts, the other laughs in greed listing them under a ridiculous price" - kotel studios

Reply 1 of 10, by dominusprog

User metadata
Rank Oldbie
Rank
Oldbie

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

Duke_2600.png
A-Trend ATC-1020 V1.1 ❇ Cyrix 6x86 150+ @ 120MHz ❇ 32MiB EDO RAM (8MiBx4) ❇ A-Trend S3 Trio64V2 2MiB
Creative AWE64 Value ❇ 8.4GiB Quantum Fireball ❇ Win95 OSR2 Plus!

Reply 2 of 10, by Nexxen

User metadata
Rank l33t
Rank
l33t
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

"One hates the specialty unobtainium parts, the other laughs in greed listing them under a ridiculous price" - kotel studios

Reply 3 of 10, by wbahnassi

User metadata
Rank Oldbie
Rank
Oldbie

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.

Turbo XT 12MHz, 8-bit VGA, Dual 360K drives
Intel 386 DX-33, TSeng ET3000, SB 1.5, 1x CD
Intel 486 DX2-66, CL5428 VLB, SBPro 2, 2x CD
Intel Pentium 90, Matrox Millenium 2, SB16, 4x CD
HP Z400, Xeon 3.46GHz, YMF-744, Voodoo3, RTX2080Ti

Reply 4 of 10, by Nexxen

User metadata
Rank l33t
Rank
l33t
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

"One hates the specialty unobtainium parts, the other laughs in greed listing them under a ridiculous price" - kotel studios

Reply 5 of 10, by wbahnassi

User metadata
Rank Oldbie
Rank
Oldbie

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...

Turbo XT 12MHz, 8-bit VGA, Dual 360K drives
Intel 386 DX-33, TSeng ET3000, SB 1.5, 1x CD
Intel 486 DX2-66, CL5428 VLB, SBPro 2, 2x CD
Intel Pentium 90, Matrox Millenium 2, SB16, 4x CD
HP Z400, Xeon 3.46GHz, YMF-744, Voodoo3, RTX2080Ti

Reply 6 of 10, by Nexxen

User metadata
Rank l33t
Rank
l33t
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

"One hates the specialty unobtainium parts, the other laughs in greed listing them under a ridiculous price" - kotel studios

Reply 7 of 10, by Roman555

User metadata
Rank Oldbie
Rank
Oldbie
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

User metadata
Rank l33t
Rank
l33t
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

"One hates the specialty unobtainium parts, the other laughs in greed listing them under a ridiculous price" - kotel studios

Reply 9 of 10, by wbahnassi

User metadata
Rank Oldbie
Rank
Oldbie

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.

Turbo XT 12MHz, 8-bit VGA, Dual 360K drives
Intel 386 DX-33, TSeng ET3000, SB 1.5, 1x CD
Intel 486 DX2-66, CL5428 VLB, SBPro 2, 2x CD
Intel Pentium 90, Matrox Millenium 2, SB16, 4x CD
HP Z400, Xeon 3.46GHz, YMF-744, Voodoo3, RTX2080Ti

Reply 10 of 10, by Nexxen

User metadata
Rank l33t
Rank
l33t
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

"One hates the specialty unobtainium parts, the other laughs in greed listing them under a ridiculous price" - kotel studios