diablonet
Posts: 11
Joined: 02 Nov 2018, 16:31

Sega Nomad - CD mod required for Mega SD

17 Jun 2019, 20:00

Hello, can someone please share how to mod the Sega Nomad for Mega SD audio compatibility? thank you

diablonet
Posts: 11
Joined: 02 Nov 2018, 16:31

Re: Sega Nomad - CD mod required for Mega SD

18 Jun 2019, 23:13

I got this from Mobius Strip Tech:

There are 2 methods to modify Sega Nomad to get audio from CD games on Mega SD.

The hard method (better quality), using a triple bypass mod, he will sell the mod on his store on the near future.
The easy method (decent quality), by doing the following mod:

B3->47kohm resistor->0.022uf cap one leg to ground->lift pin 10 of 315-5684 and connect to the non-grounded leg of cap.
Same connection for B1 to pin 24 of 315-5684.


I hope to get a diagram or pics for the easy method.

diablonet
Posts: 11
Joined: 02 Nov 2018, 16:31

Re: Sega Nomad - CD mod required for Mega SD

18 Jun 2019, 23:41

On my research I found that the easy mod method audio sample is 8 bit 22k, this is an audio sample of that quality


diablonet
Posts: 11
Joined: 02 Nov 2018, 16:31

Re: Sega Nomad - CD mod required for Mega SD

20 Jun 2019, 01:41

I did the mod on my Nomad and it works! by this I got the following features:


1.- SMS FM music from Everdrive X7.
2.- WAV playback from Everdrive X7 (22khz 8 bit), sounds acceptable.
3.- Music from Sega CD games running on Mega SD.

I did the following:

B1 (catridge) <-----> .022uf capacitor not grounded leg <-----> 47k resistor <-----> Pin 24 Sega IC 315-5684
B3 (catridge) <-----> .022uf capacitor not grounded leg <-----> 47k resistor <-----> Pin 10 Sega IC 315-5684

I attached some pictures of the procedure:
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