This is a fork of Retroianer.de (matze79) THT design, modified by me (rime/Fancy Rats), adjusted for Kicad, with original author markings.

Source: https://github.com/r1me/Simple-LPTsnd-Kicad

Description can be found at the project website: https://www.retrokits.de/index.php/simple-lptsnd/

The Covox Speech Thing (also known as Covox plug) was a computer accessory for outputting digitized sounds. It is a primitive 8-bit D/A converter (an R2R network) in the form of an adapter plug that connects to the PC’s printer port to provide an analog output.

The Simple LPTsnd is a variant of the Covox Plug and is based on the schematic of Wikipedia.

But it has a special feature, it is also SoundJR and FTL sound adapter compatible. So it can be used with the SoundJR Windows 3.x driver which offers a better performance than the original Covox driver.And the game Dungeon Master (FTL Sound Adapter)

You can find the schematics and PCB layout of THT Version on matze79 Github account:

https://github.com/matze79/Simple-LPTsnd

Here is a list of tested and compatible software:

MP3 and WAV Player

• MP3 Player von RayeR – CWSDPMI needed
• Cvxplay (Wav File Player)
• WavePlay

MOD Players

• Inertia Player
• GLX Player
• Modplay
• Mod Play Pro
• Rainbow Player
• Visual Player 2.0
• Qmpd v1.2
• MEGAPLAY v0.97
• Mod Master and Mod Master XT

Music / Tracker:

• Scream Tracker
• Fast Tracker
• Impulse Tracker
• Sound Club
• Space Pigs Tracker

MIDI:

?

Games:

• 3D Dinsaur Adventure
• 688 Attack Sub
• Arachanophobia
• Adventures of Robbo
• Battle Bugs (EMS required!)
• Chopper Duell
• Dungen Master (FTL Soundadapter)
• Doom 2D
• Electro Man / Electro Body
• Pinball Fantasies 1 & 2
• Pinball Dreams 2
• SimAnt
• Shadow President
• Star Control 2
• Sticky Bear Townbuilder
• Street Fighter 2
• Yo! Ye! Beat the Ghosts
• Chuck Yeager’s Air Combat
• Uncover It!
• Ports of Call v2.0
• Pim Pam Pum
• Hariboys Quest
• Leather Goddesses of Phobos 2
• Last Half of Darkness
• Zorro
• Zoo Keeper (1997)

Emulators:

• No$GMB – Gameboy Emulator
• No$C64 – C64 Emulator
• C64S – C64 Emulator

Soundcard Emulator:

• TEMU emulates Disney Soundsource and Tandy
• VirtualSound Blaster -> emulates SB effects -> for example Prince of Persia (Digital FX)
• Covoxer – Tandy 3 Voice Sound

Windows 3.x driver (only WAV Output, not MIDI)

• COVOXWIN.ZIP
• SOUNDJR driver (volume regulation doesn't work)
• LPTDAC.386: LPTDAC Waveout Driver Version 1.0á (3) (95/98 nonSE untested)

Demos

• Crystal Dreams 1 & 2
• Cronologia
• Dig Ice
• Hysteric Overload
• Lunatic
• Physical
• Wish