{"id":476,"date":"2026-06-13T11:33:29","date_gmt":"2026-06-13T11:33:29","guid":{"rendered":"https:\/\/www.r3tr0.net\/index.php\/wondermca\/"},"modified":"2026-06-13T11:33:29","modified_gmt":"2026-06-13T11:33:29","slug":"wondermca","status":"publish","type":"page","link":"https:\/\/www.r3tr0.net\/index.php\/wondermca\/","title":{"rendered":"WonderMCA"},"content":{"rendered":"

Bringing open, software-defined hardware to the IBM PS\/2 Micro Channel bus.<\/strong><\/p>\n\n

WonderMCA is an open-source expansion-card project for IBM PS\/2 machines built around the RP2350<\/strong> (Raspberry Pi Pico 2). In the spirit of PicoMEM<\/em> and PicoGUS<\/em>, it aims to bring modern, software-defined peripherals \u2014 sound, memory and I\/O \u2014 to a platform that has been starved of affordable expansion cards for decades.<\/p>\n\n

\ud83d\udea7 Work in progress. WonderMCA is in active development \u2014 this page is a project overview and build log, not a finished product yet. Follow along below and join the waitlist to be notified.<\/strong><\/div>\n\n
Join the waitlist<\/a><\/div>
Read the build log<\/a><\/div><\/div>\n\n

Why WonderMCA<\/h2>\n\n

Micro Channel machines have always been the awkward cousins of the retro-PC world: powerful for their day, but locked behind a proprietary bus with scarce documentation and almost no modern, open hardware. Working MCA expansion cards are rare and expensive when they appear at all.<\/p>\n\n

WonderMCA exists to change that \u2014 a single, reprogrammable card that emulates the peripherals MCA users actually want, built in the open so the community can use, study and extend it.<\/p>\n\n

What it does<\/h2>\n\n