Parallel/LPT-port soundcard using microcontroller. Supports Covox Speech Thing/Intersound MDO, Disney Sound Source (DSS) and Stereo-on-1 DAC.
Thread at Vogons: https://www.vogons.org/viewtopic.php?f=62&t=93225
- ESP32-PICO-KIT (if other ESP32 is used, modify pins)
- I2S DAC (e.g. PCM5102A/GY-PCM5102 or I2S DAC amplifier MAX98357A)
| ESP32 | LPT (D25) |
|---|---|
| Covox: | |
| IO18 🟤 | 2 (D0) |
| IO19 🟠 | 3 (D1) |
| IO27 🔵 | 4 (D2) |
| IO21 🟢 | 5 (D3) |
| IO22 🟡 | 6 (D4) |
| IO23 🔴 | 7 (D5) |
| IO13 🔘 | 8 (D6) |
| IO14 🟣 | 9 (D7) |
| GND ⚫ | GND (18-25) |
| DSS: | |
| IO9 ⚪ | 17 (FIFOCLK) (Select Printer_) (PC->DSS) |
| IO10 ⚫ | 10 (FIFOFULL) (ACK) (DSS->PC) |
| Stereo-on-1: | |
| IO4 ⚪ | 1 (Strobe_) (channel select PC->Covox) |
| resistor between IO4 and 5V for external pullup (I have 2.15kohm, 4.7kohm might work too) | |
| ESP32: | I2S DAC: |
| 5V 🔴 | Vin (use 5V if possible, more stable) |
| GND ⚫ | Ground |
| IO25 🟢 | DATA |
| IO32 🟡 | BLCK |
| IO26 🟤 | WCLK (must be GPIO 0-31) |
| GND | SCK (if GY-PCM5102) |
* = IO9 and IO10 is only usable with ESP32-PICO-KIT (ESP32-PICO-D4) (with ESP32-WROOM-32 use 16 and 17)
- https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf
- https://randomnerdtutorials.com/esp32-pinout-reference-gpios/
- https://www.weigu.lu/microcontroller/tips_tricks/esp32_tips_tricks/index.html
- https://www.mischianti.org/wp-content/uploads/2020/11/ESP32-DOIT-DEV-KIT-v1-pinout-mischianti.png
- https://www.mischianti.org/wp-content/uploads/2021/07/ESP32-DEV-KIT-DevKitC-v4-pinout-mischianti.png
- https://docs.espressif.com/projects/esp-idf/en/latest/esp32/_images/esp32-pico-kit-v4-pinout.png
- https://europe1.discourse-cdn.com/arduino/optimized/4X/2/3/1/2319cb54d8691ab1d1ba749b7992710217dcacf2_2_500x500.jpeg
- Adafruit Mono 2.5W Class D Audio Amplifier - PAM8302: https://www.adafruit.com/product/2130
- ESP32 DAC: https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/dac.html
- Xtensa® Instruction Set Architecture (ISA) Reference Manual: https://0x04.net/~mwk/doc/xtensa.pdf
- Is ESP32 5v tolerant? https://voodoo.business/2021/05/19/are-the-esp32-and-esp8266-5v-tolerant-yes-they-officially-are/
- https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-guides/memory-types.html
- https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/peripherals/i2s.html
- PCM5102: https://www.ti.com/lit/ds/symlink/pcm5100a.pdf
- DSS/Covox exclusive games? https://www.vogons.org/viewtopic.php?t=57885
- LPT: https://www.epanorama.net/circuits/lptpower.html
- LPT: https://www.edaboard.com/threads/parallel-port-max-current-sink-output.49356/
Looks like zeropoint is 128 (0x80). Tested with Hocus Pocus (Covox) and Wolfenstein 3D (DSS).
- https://en.wikipedia.org/wiki/Covox_Speech_Thing
- https://www.vgmpf.com/Wiki/index.php?title=Intersound_MDO
- Covox supported games: https://www.mobygames.com/attributes/attribute/43/
- Intersound MDO supported games: https://www.mobygames.com/attributes/attribute/1860/
- Cannot use interrupts, they are too slow. Dedicate another core for bitbanging FIFOCLK signal.
- https://github.com/MacLeod-D/ESp32-Fast-external-IRQs
- Use I2S WCLK for unload buffer interrupt
- DAC doesn't work with 7kHz so double samples to 14kHz
- DSS supported games: https://www.mobygames.com/attribute/sheet/attributeId,44
- Miles Sound System (MSS) DSS patch: https://www.vogons.org/viewtopic.php?t=69539
- Disney Sound Source driver for Win3x, Win9x, WinNT 4: http://www.vogonsdrivers.com/getfile.php?fileid=1680&menustate=0
- DSS Programmers Guide: https://archive.org/details/dss-programmers-guide/page/n1/mode/2up
- Reversing the Disney Sound Source: https://www.vogons.org/viewtopic.php?f=62&t=42250&start=140
- DIY DSS: https://www.vogons.org/viewtopic.php?p=474360#p474360
- Vogons Disney Sound Source with FIFO-buffer ICs: https://www.vogons.org/viewtopic.php?p=405296#p405296
- Dungeon Master DSS detection: https://www.vogons.org/viewtopic.php?t=40751
- Wolfenstein 3D: writes 32 samples to FIFO and checks that FIFOFULL pin activates
- Commander Keen in Keen Dreams (KDreams): v1.0 detects DSS. 33 sample interrupts comes trough. Notice: DSS is not actually supported at all in the game.
- 2,15kohm between gpio and 5V. Channelselect signal is very fast (weak) and pullup is crucial for operation.
- Crystal Dream by Triton: https://www.pouet.net/prod.php?which=463 (LPT pin 1)
- Crystal Dream 2 by Triton: https://www.pouet.net/prod.php?which=462
- Inertia Player 1.22: https://www.pouet.net/prod.php?which=29208
- Dual Module Player 3.01: https://files.scene.org/browse/resources/music/players/
- Fast Tracker II (2.09)
- Galaxy Music Player (GLX) v2.12 by Trial: https://www.pouet.net/prod.php?which=73182 (I couldn't get this to work in stereo)
- https://datasheet.octopart.com/PM7528HP-Analog-Devices-datasheet-11801523.pdf
- http://loboris.eu/ESP32/Xtensa%20Instruction%20Set%20Architecture.pdf
- https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf
- Problem in autodetection: after stereo player (iplay, dmp, crystal dreams) DSS-enable signal (LPT pin17) stays up. To get back to normal covox you have to start DSS-program or some other means drop DSS-enable signal down.
- My Covox (Stereo-On-1) LPT Stereo DAC - home made sound card: https://www.vogons.org/viewtopic.php?t=30139
- Covox in Stereo on one LPT Port - LPTSND X2 (Prototype): https://www.vogons.org/viewtopic.php?t=83891
- Problem with ESP32 GPIO reading: espressif/arduino-esp32#4172
[speaker]
disney=true
dmp -c6 -p378 -s44100 -q song.mod # covox
dmp -c12 -p378 -s30000 -q song.mod # stereo-in-one
or
SET DMP=-c12 -p378 -s30000 -q
- https://github.com/viti95/FastDoom
- You need wad file from shareware or retail version
- To get music (with fx) from Covox/DSS, you need music as raw files. There is OGG-files in Steam version, but you may find some Doom ogg-files with google also. You see filenames and how to convert ogg files to raw files from this script: https://github.com/viti95/FastDoom/blob/master/SCRIPTS/PCMconvert/convert.sh
- PCM Music format is unsigned 8-bit PCM, and supports 11025, 22050 or 44100 Hz frequencies.
- With Covox: Convert ogg to raw in same samplerate as you are selected from fdsetup. Notice that this also affects to minimum memory requirements (whole raw-file must fit to memory at once)
Press enter after every line (also when there is empty line).
C:\>debug
n pin17.com ; filename
a100 ; assemble to address :0100
mov dx,37a ; 37Ah = LPT control pins port
in al,dx ; read current state from port
or al,8 ; bit 4 high -> pin 17 low ("and al,F7" would get it to high)
out dx,al ; write new state to port
ret ; return to DOS
; end assembler mode with empty line
rcx ; give how many bytes to write in cx register
8 ; 8 bytes to write
w ; write file
q ; quit