Coregrafx Sound Issue

[thesteve]

Wow
Just checked, and it does seem to work from CG DIN

[Fidde_se]

Yes it does, the IFU is just a big audio mixer really, the game sound is mixed with the incoming mono signal from the IFU containing the ADPCM and CDA somewhere around its amps, it even sends it out on the RF on the white PCE

[wolfman]

Yes it does, the IFU is just a big audio mixer really, the game sound is mixed with the insamling mono signal from the IFU containing the ADPCM and CDA somewhere around its apps, it even sends it out on the RF on the white PCE

Ok, so how is it mixed INSIDE the Coregrafx? As I don´t get CD sound BUT chiptune, there must be some mixer inside the CG, as there is a SND IN on the Exp connector. From there I guess it is mixed in relation to chiptune, right?

So where would I have to look for? I guess there must be some kind of bad trace or broken connection somewhere...

[turbokon]

I know for the tgcd and tg16 setup,  you can't get sound from ADPCM and CDA coming thru on the tg16 sound output itself.  I had tested it a component vid/stereo modded tg16 deck.

[wolfman]

Ok, I have to correct myself on something:

I DO get CDAUDIO when I play a pure audio CD (very very faint, have to crank up volume high), but I DON´T any kind of audio from a CD GAME!

I tried with Lords of the rising sun. There is NO SOUND whatsover from the CG.

It must be CG-related, since it works with my LT. Looks like the mixing circuit or whatever there is has a malfunction.

[Fidde_se]

1. So on the LT you get them all? Game sound, ADPCM and CDA.

2. CG you get game sound, ADPCM (weak?) and no CDA

3. CG with only audio CD you get faint CDA.

[wolfman]

1. So on the LT you get them all? Game sound, ADPCM and CDA.

2. CG you get game sound, ADPCM (weak?) and no CDA

3. CG with only audio CD you get faint CDA.

Ok, I have tested it again now:


PCE LT

-PSG sounds from LT headphone jack seems to be stereo from what I hear
-All sounds coming from CDROM2 via LT headphone jack are mixed together and play fine


IFU

-all sounds from CDROM2 are mixed togehter and come out thru IFU Audio ports
-PSG sounds come thru as well and seem to be stereo from what I hear


CG

-via AV DIN cable I only get PSG in good quality and probably in stereo from what I hear
-CD-Audio faintly audible when stereo is turned up in volume all way, so actually it should be regarded to as "no sound".
-NO ADPCM or CD-ingame audio audible at all (tested with ICFTD - no sounds, just a little noise)
-with Output jacks from IFU ALL SOUNDS are audible and mixed like in the above example like I use my LT.


Hope this helps. I already have a conversation with Charles Macdonald on this, I am waiting for his response as well.

[Fidde_se]

Check pin B1 on the ext connector on the CG (middle row)
And were it goes, this is where it comes from, and somewhere
 from there to the DIN the problem lies.

[thesteve]

can someone check if the CDA works on the RF out of the TG-CD setup?

[Fidde_se]

Keith maybe? I can only confirm that it does on the briefcase setup.

One day I might even make a EXT extender cable to run TGs in the IFU, RAU-30 should work to some extent, but surprise it's nowhere near full pin, not even video signals are sent threw if I remember correctly.

[Fidde_se]

Oh, and any one listening out there donate me non working white PCE and CoreGrafx so I can do PCB layouts of them and lift and measure every SMD capacitor =)