I guess 3512 are easier to find, bought mine just a month ago (verkkokauppa.com in Finland - product details say 3112, but their card is 3512) and flashed with: http://www.wiebetech.com/webtech.php?sfid=133&pcode=TC-PCI
Boots fine to MacOS X but MorphOS does not boot if the card is installed (flashed with Mac bios or not... I just have a grey screen and can do ctrl-Amiga-Amiga reset from keyboard)