So here I am, writing a bit of test code to figure out the behavior of x87 FPUs with regard to saving and loading the FPU state (FSTENV/FLDENV and FSAVE/FRSTOR instructions in different modes and formats). The original real-mode only … <a href=“http://www.os2museum.com/wp/minor-387-documentation-mystery/”>Continue reading <span class=“meta-nav”>→</span></a>