Category Archives: Bugs

Floating-Point Exceptions and DOS Extenders

Posted on September 5, 2014 by Michal Necasek

Recently I had a need to test the behavior of floating-point exceptions (FPEs) in environments where traditional FPE reporting is used. To briefly recap, in the original PC equipped with an 8088/8087 pair, floating-point exceptions, which are generally asynchronous events, were … Continue reading →

Posted in 386, Bugs, DOS, DOS Extenders, PC architecture | Leave a comment

OS/2 Kernel Debugger and MVDM Interrupts

Posted on August 29, 2014 by Michal Necasek

While working on an unrelated problem, I noticed a strange behavior of one of my OS/2 VMs running OS/2 Warp 4.52. To cut a long story short, if an unhandled floating-point exception occurred in a DOS window (VDM, or Virtual … Continue reading →

Posted in Bugs, Debugging, OS/2 | 12 Comments

Timing In Software Is Too Hard?

Posted on May 16, 2014 by Michal Necasek

I recently attempted to install RedHat Linux 3.0.3 (that’s the one from 1996, not RHEL 3.0) in VirtualBox. I thought I’d use the BusLogic SCSI emulation and the newer 1.3.57 Linux kernel. It did not work at all. The problem … Continue reading →

Posted in Bugs, BusLogic, Linux, SCSI | 32 Comments