Famicom World

Family Computer => Technical & Repair Assistance => Topic started by: Rrobo on September 02, 2018, 07:56:50 am

Title: Microphone doesn't seem to work on rgb modded original famicom
Post by: Rrobo on September 02, 2018, 07:56:50 am
Hello i have recently purchased a pre rgb modded original famicom from oldskoolconsoles.com and have noticed that i can't hear anything from the player 2 controller microphone through my tv speakers
Now i'm wondering is this just how it is with rgb modded original famicom's or is my microphone busted?
Unfortunately i don't have any games that use the microphone yet since i'm new to famicom collecting so i can test if the games recognize sound from it and i'm just not hearing it
Any help about this would be appreciated thank you in advance  :)
Title: Re: Microphone doesn't seem to work on rgb modded original famicom
Post by: Retrospectives on September 02, 2018, 08:34:32 am
Yes, is the RGB mod. Even certain AV mods are prone to disable the controller 2 mic.

As you can test it, just turn up the volume slider and the volume on the tv. Try taking something like a pen or such. Tap it on the controller lightly and if there is no sound coming out from TV = Mic has been disabled.

I have no idea how to reverse this or if can be prevented and still have RGB mod, but I know on AV mods there are ways around it to still have the mic activated.
Title: Re: Microphone doesn't seem to work on rgb modded original famicom
Post by: VegaVegas on September 09, 2018, 01:10:56 am
It is possible to restore it but you may hear some humming noise again. Just cut away some audio resistors and route the audio track with a cable back to cart pin #45, you can use a filter cap to reduce noise, 22uf for instance. I can give more detailed instructions if needed
Title: Re: Microphone doesn't seem to work on rgb modded original famicom
Post by: Great Hierophant on January 11, 2020, 10:23:19 am
Sorry to resurrect an old thread.  The NESRGB and those AV mods only disable the audible output of the microphone.  They do not affect its ability to be used as a game input, so you can still shout or blow into the microphone to kill the Pols-Voices in Zelda.
Title: Re: Microphone doesn't seem to work on rgb modded original famicom
Post by: P on January 11, 2020, 10:34:02 am
Resurrecting old threads to contribute to them is encouraged.

But why isn't the microphone sound mixed to NESRGB output? Does it tap the sound from the wrong spot or skip the microphone mixing in some way? I thought expansion audio was mixed in last.
Title: Re: Microphone doesn't seem to work on rgb modded original famicom
Post by: Great Hierophant on January 13, 2020, 09:38:25 am
The NESRGB mod for the original Famicom taps the CPU pins directly for audio and has its own audio amplifier on its RF module replacement board.  The microphone's sound input is mixed into the audio output after the CPU pins are mixed together.
Title: Re: Microphone doesn't seem to work on rgb modded original famicom
Post by: VegaVegas on January 13, 2020, 10:17:26 am
The microphone from controller 2 produces a lot of noise, this is why it gets castrated in many console mods
Title: Re: Microphone doesn't seem to work on rgb modded original famicom
Post by: P on January 13, 2020, 01:44:05 pm
I guess the NESRGB is designed with the NES in mind rather than the Famicom. But I guess it's possible to tap the sound after it's mixed or it would be pretty useless.