S2P : Tiny Parallel Port General MIDI Synthesizer

General MIDI Synthesizer for parallel port

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Small size general MIDI Synthesizer for parallel port.DOS game compatibility through SoftMPU TSR and patching.I produced a small batch of these boards, they are available here :

This PCB provides great quality general midi sound for computers that have a parallel port.

In particular, for 386+ DOS computers, a TSR was written to implement compatibility with existing real mode games on 386+. (for example Vikings). 

Also available is s2ppatcher : which allows to patch some DOS games.

And finally also an SDK is available for your own game development :

PCB Connections :


You can download the special softmpu DOS TSR version compiled executable and sources from 

Run SoftMPU specifying the parallel interface to be used and the base port

address of the MPU-401 interface, e.g.
To enable MT-32 compatibility, add the /MT32 switch to the command line, e.g.

A Sound Blaster base port address and IRQ can optionally be specified if
MPU-401 interrupts are required.

We are also working on a patching utility, and had success patching doom for S2P compatibility, so far.

Working games : 

  • Doom and other games using the same sound engine (Heretic, Hexen, Raptor: Call of the Shadows, etc.)
  • Games that use the Miles Audio Interface Library, both 16-bit and 32-bi

Demonstration of SoftMPU in action with the DOS game vikings :

The board uses the SAM2695 synthesizer chip from Dream.

Parallel port pinout of S2P : 

Using the patcher s2ppatch :  example patching doom :

Scali created an SDK for adding S2P, OPL2LPT and OPL3LPT support in your homebrew DOS games :

Check it out here :

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terrence vergauwen wrote 01/12/2021 at 04:04 point


I'm interested in purchasing one of your "DreamBlaster SP2" midi soundscard for the paralllel port on an older computer.
I was wondering if the "DreamBlaster S2P : General MIDI wavetable synth for parallel port" is compatible with an IBM PC/XT with a 80186 CPU and 640KB RAM.
I do have an additional 32KB of expanded RAM available.
The PC/XT has a DB25 parralel port for attaching parallel printers...

I'm sure the hardware will be compatible, I'm just a little bit worried about the driver TSR that's mentioned on the project space as it talks about running it on a 386 CPU. Would the TSR work on a 16-bit 80186 CPU equiped XT running MS-DOS 5.0 ?

Thank you for your time,
and I hope to get a reply,


  Are you sure? yes | no

serdef wrote 01/12/2021 at 17:24 point

Hi Terrence, the TSR works with 386 and higher.

  Are you sure? yes | no

terrence vergauwen wrote 01/12/2021 at 19:58 point

thats too bad... :( I might try an OPL2 on LPT port then ;)

  Are you sure? yes | no

serdef wrote 01/12/2021 at 20:03 point

instead of TSR, you can use the S2P patch utility s2ppatch :

game compatibility is limited, it is best to check which games actually would run on your xt

  Are you sure? yes | no

terrence vergauwen wrote 01/12/2021 at 20:08 point

Do you know of any games that are compatible and are somewhat "playable" on an XT 80186 @ 7MHz with 640KB RAM with CGA graphics?

What about the older sierra games, like larry 1, 2, 3, space quest 1,2,3,4, kings quest 1,2,3,4 etc... ?

It seems quite tricky acording to what i read on the page for the patch utility, and i can't run quake and such ;)

  Are you sure? yes | no

terrence vergauwen wrote 01/12/2021 at 20:10 point

I'm trying to do a "world first on youtube", which is attach a soundcard to an HP 200LX palmtop (from 1994) which is a tiny MS-DOS 5.0 machine, after i've managed to acquire a very rare 200LX compatible parallel port PCMCIA card...

  Are you sure? yes | no

terrence vergauwen wrote 01/12/2021 at 20:14 point

Do you think the list of compatible patched games for the opl2lppt here:

should be identical for the patch utility for the dreamblaster sp2 ?

There are several games on their that I actually have installed on the palmtop that work fine :)

  Are you sure? yes | no

serdef wrote 03/09/2019 at 13:41 point

  Are you sure? yes | no

serdef wrote 07/03/2018 at 17:16 point

S2P DOS Game patcher under development :

  Are you sure? yes | no

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