Saturn:Digital Audio (SPDIF) Mod: Difference between revisions

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Original guide adapted from a [https://web.archive.org/web/20170626072614/https://www.assemblergames.com/threads/saturn-dreamcast-toslink.57670/ post by citrus3000psi]. A good writeup about this mod can be found on [https://www.firebrandx.com/psxdigitalaudio.html FireBrandX's site].  
[[File:Saturn SPDIF Mod 5.jpg|thumb|Example completed install.]]
There are two boards that will allow you to obtain digital audio: Will's Sega Saturn SPDIF Kit and the Pep Audio board by citrus3000psi. There are some reports of issues with the Pep Audio board, so you may want to opt for Will's kit.


This tutorial assumes you have a TDA1386T DAC chip in your Saturn.  
== Will's Sega Saturn SPDIF Kit ==
 
=== Required Parts ===
* [https://www.willsconsolemodifications.co.uk/index.php?route=product/product&path=59_73&product_id=59 Will's Sega Saturn SPDIF Kit]
* If using TOSLINK:
** TX178A (TOSLINK port) and [https://oshpark.com/shared_projects/b9Fjt84V TOSLINK PCB by citrus3000psi] OR [https://www.laserbear.net/products/sega-saturn-toslink-spdif-battery-door TOSLINK battery door].
* If not using a TOSLINK port, you will need your own jack.
 
=== Installation ===
 
The Sega Saturn has 3 types of DAC Chips depending on the motherboard version number, locate the DAC chip on your motherboard to find which one you have.


== Required Parts ==
{| class="wikitable"
|-
! Signal !! TDA1386T !! PCM1710 !! PCM1717E !! YMF292 (SCSP)
|-
| EMPH: Emphasis || 13 || 27 - C62 || C62 (North Pad) ||
|-
| RST: Reset || 15 || 25 || Pin 18 on chip ||
|-
| ILRCK: Word Clock || 5 || Pin 1 (TP112) || Pin 4 (TP112) || 63
|-
| ISCLK: Bit Clock || 4 || Pin 3 (TP111) || Pin 6 (TP111) || 62
|-
| SDIN: Audio Data || 6 || Pin 2 (TP110) || Pin 5 (TP110) || 61
|-
| OMCK: Master Clock || 12 || Pin 5 (TP113) || Pin 1 (TP113) || 64
|}


Parts are dependent on if you want SPDIF or TOSLINK:
# Connect wires from the mod kit board solder points (under the blue line) to the following points to the Sega Saturn DAC chip using the table below to find the corresponding leg number on the DAC chip.
* SPDIF:
#: [[File:Sega Saturn SPDIF Kit - 1.png|400px]]
** [https://oshpark.com/shared_projects/dmxP90H4 PEP Audio 1.1 - SPDIF PCB by citrus3000psi]
# If your Saturn has the TDA1386 DAC, bridge jumper `J1`. If your Saturn has the PCM1710 or PCM1717E DAC, bridge jumper `J2`.
** TX178A (SPDIF port)
#: [[File:Sega Saturn SPDIF Kit - 2.png|400px]]
** 0.1uF capacitor
# Connect the SPDIF, GND, and 5V pads on the PCB to the SPDIF PCB and find a suitable mounting location for the jack (if not using the battery door).
#: [[File:Sega Saturn SPDIF Kit - 4.png|400px]]


* TOSLINK:
== Pep Audio Board (SPDIF or TOSLINK) ==
** [https://oshpark.com/shared_projects/kvtStGOq PEP Audio 1.2 - TOSLINK PCB by citrus3000psi]
Original guide adapted from a [https://web.archive.org/web/20170626072614/https://www.assemblergames.com/threads/saturn-dreamcast-toslink.57670/ post by citrus3000psi]. A good writeup about this mod can be found on [https://www.firebrandx.com/psxdigitalaudio.html FireBrandX's site].
** 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/
This tutorial assumes you have a TDA1386T DAC chip in your Saturn.  


== SPDIF Installation ==
=== Required Parts ===


# Assemble the PEP Audio PCB.
Parts are dependent on if you want SPDIF or TOSLINK:
# On the back of the motherboard, solder these four points to your SPDIF board, matching the names up.
* [https://oshpark.com/shared_projects/kvtStGOq Pep Audio 1.2 PCB by citrus3000psi]
#: [[File:Saturn SPDIF Mod 1.jpg|400px]]
* TC7W04FK chip
# Solder +5V to pin 7 of the TC9231N and connect GND to your SPDIF board.
* TC9231N chip
#: [[File:Saturn SPDIF Mod 2.jpg|400px]]
* Two 0.1uF capacitors (0603 size)
# Mount your SPDIF PCB. This is one suggested location, but it may depend on what devices you may have installed in your unit.
* If using TOSLINK:  
#: [[File:Saturn SPDIF Mod 3.jpg|400px]]
** TX178A (TOSLINK port) and [https://oshpark.com/shared_projects/b9Fjt84V SPDIF PCB by citrus3000psi] OR [https://www.laserbear.net/products/sega-saturn-toslink-spdif-battery-door TOSLINK battery door].
# Mount your external jack. This is one suggested location, but may require trimming of the case.
* If not using a TOSLINK port, you will need your own jack.
#: [[File:Saturn SPDIF Mod 4.jpg|400px]]
* Example completed install:
*: [[File:Saturn SPDIF Mod 5.jpg|400px]]


== TOSLINK Installation ==
=== Installation ===


# Assemble the PEP Audio PCB.
# There exists an issue (as noted by [https://shmups.system11.org/viewtopic.php?p=1425441&sid=e4913934cbae57d52de7db492efe8d16#p1425441 FireBrandX]) with the Pep Audio PCB where some of the boards have extra ground fill in front of the pins and cause shorts. Use a multimeter to make sure none of the pads (GND excluded) have continuity to GND. If you do find continuity, you will need to use a hobby knife to cut off the area marked in red below:
# Bridge the "SAT" pad on the PEP Audio PCB to the pad next to it.
#* [[File:Saturn SPDIF Mod 6.jpg|400px]]
# On the back of the motherboard, solder these four points to your TOSLINK adapter:
# Assemble the Pep Audio PCB.
## DATA on motherboard to DAT on PEP Audio PCB.
# Bridge the "SAT" pad on the Pep Audio PCB to the pad next to it.
## BCK on motherboard to BC on PEP Audio PCB.
# On the back of the motherboard, solder these points to the Pep Audio board.
## LRCK on motherboard to LRC on PEP Audio PCB.
## `DATA` on motherboard to `DAT` on Pep Audio PCB ('''not''' `DATA`!).
## MCLK on motherboard to MC on PEP Audio PCB.
## `BCK` on motherboard to `BC` on Pep Audio PCB.
## `LRCK` on motherboard to `LRC` on Pep Audio PCB.
## `MCLK` on motherboard to `MC` on Pep Audio PCB.
#: [[File:Saturn SPDIF Mod 1.jpg|400px]]
#: [[File:Saturn SPDIF Mod 1.jpg|400px]]
# Solder +5V to pin 7 of the TC9231N and connect GND to your TOSLINK adapter.
# Solder +5V to pin 7 of the TC9231N.
#: [[File:Saturn SPDIF Mod 2.jpg|400px]]
#: [[File:Saturn SPDIF Mod 2.jpg|400px]]
# Mount your SPDIF/TOSLINK PCB. This is one suggested location, but it may depend on what devices you may have installed in your unit.
# Connect the output jack:
#* If using a TOSLINK port, connect +5V and GND to it. Also connect `DATA` ('''not''' `DAT`!) on the Pep Audio PCB to the `In` on the TOSLINK port.
#* If using your own SPDIF port, connect `DATA` on the Pep Audio PCB to the data pin and GND to GND.
# Mount your SPDIF or TOSLINK PCB (if not using the battery door). This is one suggested location, but it may depend on what devices you may have installed in your unit.
#: [[File:Saturn SPDIF Mod 3.jpg|400px]]
#: [[File:Saturn SPDIF Mod 3.jpg|400px]]
# Mount your external jack. This is one suggested location, but may require trimming of the case.
# Mount your external jack. This is one suggested location, but may require trimming of the case.
#: [[File:Saturn SPDIF Mod 4.jpg|400px]]
#: [[File:Saturn SPDIF Mod 4.jpg|400px]]
* Example completed install:
*: [[File:Saturn SPDIF Mod 5.jpg|400px]]

Latest revision as of 16:19, 15 July 2023

Example completed install.

There are two boards that will allow you to obtain digital audio: Will's Sega Saturn SPDIF Kit and the Pep Audio board by citrus3000psi. There are some reports of issues with the Pep Audio board, so you may want to opt for Will's kit.

Will's Sega Saturn SPDIF Kit

Required Parts

Installation

The Sega Saturn has 3 types of DAC Chips depending on the motherboard version number, locate the DAC chip on your motherboard to find which one you have.

Signal TDA1386T PCM1710 PCM1717E YMF292 (SCSP)
EMPH: Emphasis 13 27 - C62 C62 (North Pad)
RST: Reset 15 25 Pin 18 on chip
ILRCK: Word Clock 5 Pin 1 (TP112) Pin 4 (TP112) 63
ISCLK: Bit Clock 4 Pin 3 (TP111) Pin 6 (TP111) 62
SDIN: Audio Data 6 Pin 2 (TP110) Pin 5 (TP110) 61
OMCK: Master Clock 12 Pin 5 (TP113) Pin 1 (TP113) 64
  1. Connect wires from the mod kit board solder points (under the blue line) to the following points to the Sega Saturn DAC chip using the table below to find the corresponding leg number on the DAC chip.
    Sega Saturn SPDIF Kit - 1.png
  2. If your Saturn has the TDA1386 DAC, bridge jumper J1. If your Saturn has the PCM1710 or PCM1717E DAC, bridge jumper J2.
    Sega Saturn SPDIF Kit - 2.png
  3. Connect the SPDIF, GND, and 5V pads on the PCB to the SPDIF PCB and find a suitable mounting location for the jack (if not using the battery door).
    Sega Saturn SPDIF Kit - 4.png

Pep Audio Board (SPDIF or TOSLINK)

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:

Installation

  1. There exists an issue (as noted by FireBrandX) with the Pep Audio PCB where some of the boards have extra ground fill in front of the pins and cause shorts. Use a multimeter to make sure none of the pads (GND excluded) have continuity to GND. If you do find continuity, you will need to use a hobby knife to cut off the area marked in red below:
    • Saturn SPDIF Mod 6.jpg
  2. Assemble the Pep Audio PCB.
  3. Bridge the "SAT" pad on the Pep Audio PCB to the pad next to it.
  4. On the back of the motherboard, solder these points to the Pep Audio board.
    1. DATA on motherboard to DAT on Pep Audio PCB (not DATA!).
    2. BCK on motherboard to BC on Pep Audio PCB.
    3. LRCK on motherboard to LRC on Pep Audio PCB.
    4. MCLK on motherboard to MC on Pep Audio PCB.
    Saturn SPDIF Mod 1.jpg
  5. Solder +5V to pin 7 of the TC9231N.
    Saturn SPDIF Mod 2.jpg
  6. Connect the output jack:
    • If using a TOSLINK port, connect +5V and GND to it. Also connect DATA (not DAT!) on the Pep Audio PCB to the In on the TOSLINK port.
    • If using your own SPDIF port, connect DATA on the Pep Audio PCB to the data pin and GND to GND.
  7. Mount your SPDIF or TOSLINK PCB (if not using the battery door). This is one suggested location, but it may depend on what devices you may have installed in your unit.
    Saturn SPDIF Mod 3.jpg
  8. Mount your external jack. This is one suggested location, but may require trimming of the case.
    Saturn SPDIF Mod 4.jpg
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