Welcome to the MK1869 XTREME Sound Card page!

(click on image for larger version - PROTOTYPE version shown - subject to changes)




What is it?

Inspired by the original 90s GRAVIS ULTRASOUND EXTREME card the MK1869 XTREME is an ISA sound card based on the ESS ES1869 sound controller chip coupled with the AMD Interwave for native Gravis UltraSound support . Everything is working together on a compact and optimized 4-layer PCB design. Currently under development to maximize performance.

The card is still in development and more info can be found at this VOGONS thread.


The card's main features are:

	AdLib, Sound Blaster and Sound Blaster PRO compatible for DOS (with SB ADPCM support)
	Windows drivers with up to 48khz sampling rate
	High-quality, OPL3 superset ESFM music synthesizer
	MIDI port - compatible with MPU-401 UART mode
	Integrated Spatializer 3-D audio effects processor
	Integrated dual game port
	16-bit stereo ADC and DAC
	Programmable independent sample rates from 4 kHz to 48.0 kHz for record and playback
	Full-Duplex operation for simultaneous record and playback
	ISA expansion header for PCMIDI addon
	USB-C port for future expansion usage - specs for expansion creation will be freely available
	AMD InterWave chip for native compatibility with Gravis UltraSound PnP software (included are the standard 1MB InterWave ROM bank and 4MB of RAM soldered directly on board)

More information and downloads will be added when the card reaches final state and is ready to produce.
Thanks for looking!

Contact information

Need to contact us? Need help to setup/troubleshoot things or extra info?
Please use our contact form!

Contact Form

Or you can join our Facebook group MPU-401 PC-MIDI Card Group
and make a post, we will answer ASAP!


Thanks for visiting!!!

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last update: 19-JAN-2025 , always a WIP