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Simple Stereo Upgrade

Simple Stereo Upgrade

Not yet available


     It all has begun long time ago, when Chuck Steinman of DataQue created this set of plans for building stereo sound by installing a second Pokey chip inside the best 8-bit computer ever. Once installed, the second channel has all its addresses 16 bytes set higher in the memory ($D210 - $D21F). Since then, dozens of sounds and demos that support this upgrade have been published. Most of these programs were made in Poland, but a few sound-demos were also made in other countries. The most popular programs (in my opinion, of course) playing msx in stereo are Yooomp! and Numen.


Main features :

  • GTIA sound mixing on both channnels
  • Dual Mono/STEREO switch
  • Stereo Indicator Led
  • high quality PCB
  • ROHS, PB Free



  • A fully tested and assembled STEREO BOARD
  • 2 golden plated RCA outputs
  • 1 lever switch
  • 1 precision socket



  • POKEY CHIP NOT Included 
  • ULTIMATE UPGRADE owners/users shall consider buying USWITCH in order to set stereo ON/OFF in Utimate Bios Setup
  • Installation needs some soldering skills







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