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.
 
== 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.
 
{| 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
|}
 
# 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.
#: [[File:Sega Saturn SPDIF Kit - 1.png|400px]]
# If your Saturn has the TDA1386 DAC, bridge jumper `J1`. If your Saturn has the PCM1710 or PCM1717E DAC, bridge jumper `J2`.
#: [[File:Sega Saturn SPDIF Kit - 2.png|400px]]
# 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]]
 
== Pep Audio Board (SPDIF or TOSLINK) ==
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].


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


== Required Parts ==
=== Required Parts ===


Parts are dependent on if you want SPDIF or TOSLINK:
Parts are dependent on if you want SPDIF or TOSLINK:
* SPDIF:
* [https://oshpark.com/shared_projects/kvtStGOq Pep Audio 1.2 PCB by citrus3000psi]
** [https://oshpark.com/shared_projects/kvtStGOq Pep Audio 1.2 PCB by citrus3000psi]
* TC7W04FK chip
** [https://oshpark.com/shared_projects/b9Fjt84V SPDIF Narrow PCB by citrus3000psi]
* TC9231N chip
** TX178A (SPDIF port)
* Two 0.1uF capacitors (0603 size)
** TC7W04FK chip
* If using TOSLINK:  
** TC9231N chip
** 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].
** Two 0.1uF capacitors (0603 size)
* If not using a TOSLINK port, you will need your own jack.
 
* TOSLINK:
** [https://oshpark.com/shared_projects/kvtStGOq PEP Audio 1.2 PCB by citrus3000psi]
** TC7W04FK chip
** TC9231N chip
** Two 0.1uF capacitor (0603 size)
** (Optional) [https://www.laserbear.net/products/sega-saturn-toslink-spdif-battery-door TOSLINK battery door]


== Installation ==
=== Installation ===


# 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:
# 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:
#* [[File:Saturn SPDIF Mod 6.jpg|400px]]
#* [[File:Saturn SPDIF Mod 6.jpg|400px]]
# Assemble the Pep Audio PCB.
# Assemble the Pep Audio PCB.
# Bridge the "SAT" pad on the Pep Audio PCB to the pad next to it.
# Bridge the "SAT" pad on the Pep Audio PCB to the pad next to it.
# On the back of the motherboard, solder these four points to the Pep Audio board.
# On the back of the motherboard, solder these points to the Pep Audio board.
## `DATA` on motherboard to `DAT` on Pep Audio PCB ('''not''' `DATA`!).
## `DATA` on motherboard to `DAT` on Pep Audio PCB ('''not''' `DATA`!).
## `BCK` on motherboard to `BC` on Pep Audio PCB.
## `BCK` on motherboard to `BC` on Pep Audio PCB.
Line 36: Line 69:
#: [[File:Saturn SPDIF Mod 2.jpg|400px]]
#: [[File:Saturn SPDIF Mod 2.jpg|400px]]
# Connect the output jack:
# 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 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 a SPDIF port, connect `DATA` on the Pep Audio PCB to the data pin and GND to GND.
#* 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. This is one suggested location, but it may depend on what devices you may have installed in your unit.
# 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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