Just picked up my Polar CHR-39025379 board (thanks Anh) sans data sheet. Luckily Dan O. had a copy on the “Computers for the Rest of You” class page (hidden in a directory listing) that I’m leaving here for future reference as a PDF: Polar CHR-39025379 Data Sheet

It’s a little larger than I had hoped for but should serve well as a quick way to get up and prototyping.