Saturn:Digital Audio (SPDIF) Mod

Original guide adapted from a post by citrus3000psi. A good writeup about this mod can be found on FireBrandX's site.

This tutorial assumes you have a TDA1386T DAC chip in your Saturn.

Required Parts
Parts are dependent on if you want SPDIF or TOSLINK:
 * SPDIF:
 * PEP Audio 1.1 - SPDIF PCB by citrus3000psi
 * TX178A (SPDIF port)
 * 0.1uF capacitor


 * TOSLINK:
 * PEP Audio 1.2 - TOSLINK PCB by citrus3000psi
 * TC7W04FK chip
 * TC9231N chip
 * Two 0.1uF capacitor (0603 size)

Refer to this thread for parts and more info: http://assemblergames.com/l/threads/700x-ps1-toslink-success.57639/

SPDIF Installation

 * 1) Assemble the PEP Audio PCB.
 * 2) On the back of the motherboard, solder these four points to your SPDIF board, matching the names up.
 * Saturn SPDIF Mod 1.jpg
 * 1) Solder +5V to pin 7 of the TC9231N and connect GND to your SPDIF board.
 * Saturn SPDIF Mod 2.jpg
 * 1) Mount your SPDIF PCB. This is one suggested location, but it may depend on what devices you may have installed in your unit.
 * Saturn SPDIF Mod 3.jpg
 * 1) Mount your external jack. This is one suggested location, but may require trimming of the case.
 * Saturn SPDIF Mod 4.jpg
 * Example completed install:
 * Saturn SPDIF Mod 5.jpg

TOSLINK Installation

 * 1) Assemble the PEP Audio PCB.
 * 2) Bridge the "SAT" pad on the PEP Audio PCB to the pad next to it.
 * 3) On the back of the motherboard, solder these four points to your TOSLINK adapter:
 * 4) DATA on motherboard to DAT on PEP Audio PCB.
 * 5) BCK on motherboard to BC on PEP Audio PCB.
 * 6) LRCK on motherboard to LRC on PEP Audio PCB.
 * 7) MCLK on motherboard to MC on PEP Audio PCB.
 * Saturn SPDIF Mod 1.jpg
 * 1) Solder +5V to pin 7 of the TC9231N and connect GND to your TOSLINK adapter.
 * Saturn SPDIF Mod 2.jpg
 * 1) Mount your SPDIF/TOSLINK PCB. This is one suggested location, but it may depend on what devices you may have installed in your unit.
 * Saturn SPDIF Mod 3.jpg
 * 1) Mount your external jack. This is one suggested location, but may require trimming of the case.
 * Saturn SPDIF Mod 4.jpg
 * Example completed install:
 * Saturn SPDIF Mod 5.jpg