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 :
INSIDE BOX :
INSTALLATION STEP BY STEP:
Disclaimer: If you are not familiar with soldering or you do not have proper tools, please LET a pro technician do it for you or send me your ATARI BOARD for installation. Upgrade installation cost is ~15€ only. Contact me to arrange installation. Otherwise, please remeber - wrong tools usage or low skills may damage atari and Your stereo board; any damage/harm to your hardware is NOT subject of any kind of warranty.
Audio out conenction diagram