Author Archives: Michal Necasek

Early Microsoft Networks

Posted on May 18, 2012 by Michal Necasek

Microsoft networking technologies, often referred to as SMB and/or CIFS, have a very long history, longer than one might realize. While Microsoft’s networking products only became somewhat widespread around 1993-1994 with Windows for Workgroups, their history goes back to 1984-1985. … Continue reading →

Posted in DOS, Microsoft, Networking | 17 Comments

An old idea: x86 hardware virtualization

Posted on May 13, 2012 by Michal Necasek

It is well known that virtualization of the x86 architecture is an old idea. The Intel 386 processor (1985) introduced the “Virtual 8086” (V86) mode, enabling users to run real-mode operating systems as a task within a 32-bit protected-mode operating systems. … Continue reading →

Posted in 386, Intel, Virtualization | 14 Comments

Watcom Win386

Posted on May 4, 2012 by Michal Necasek

When Windows 3.0 came out in 1990, the press loved it and users bought it in droves. Unfortunately, technically it was at best a step sideways, and Windows 3.0 was the cause of many sleepless nights for application developers. Even … Continue reading →

Posted in 386, Development, Windows | 13 Comments

DOS boot hang update

Posted on April 27, 2012 by Michal Necasek

Additional information came to light regarding the hangs with DOS 2.x/3.x when booting from a disk with large number of sectors per track. The problem appears to have been noticed sometime in 1987—perhaps. The MS-DOS OEM Adaptation Kit (OAK) for … Continue reading →

Posted in DOS, IBM, Microsoft | 4 Comments

Solaris 2.5.1 and 2.6 crashes on modern Intel CPUs

Posted on April 20, 2012 by Michal Necasek

I recently found that Solaris 2.6 and 2.5.1 does not work when run in a VM on a modern Intel CPU (Sandy Bridge generation Core i7), or to be exact fails most of the time (about nine times out of … Continue reading →

Posted in Solaris, VirtualBox, Virtualization, x86 | 27 Comments

DOS 4.0, bum rap, and mismatched expectations

Posted on April 15, 2012 by Michal Necasek

While researching the history of DOS extenders, I came across an article written in 1991 and explaining why OS/2 2.0 was going to be horribly incompatible with Windows 3.x. To support the argument, the following statement was used: “When IBM … Continue reading →

Posted in IBM, PC press | 13 Comments

NetWare for OS/2

Posted on April 13, 2012 by Michal Necasek

NetWare for OS/2 was one of the most technically interesting products of the mid-1990s. Novell’s NetWare was long established as a file server for LANs; since NetWare/386, Novell’s NOS ran as a dedicated server which was loaded from DOS but … Continue reading →

Posted in NetWare, Networking, OS/2 | 2 Comments

From a Feature to a Bug

Posted on April 6, 2012 by Michal Necasek

Sometimes the quest for backwards compatibility has unintended consequences. In some cases, the presumably beneficial backwards compatibility turns into a source of problems. The costs end up far outweighing the benefits, yet the “feature” may be difficult to get rid … Continue reading →

Posted in DOS, PC history, Windows | 13 Comments

Operating System/2 announced 25 years ago

Posted on April 1, 2012 by Michal Necasek

On April 2nd of 1987 (not April 1st, that wouldn’t do!), IBM and Microsoft jointly announced Operating System/2, the long-awaited protected-mode version of DOS. However, OS/2 was not the only product announced on that day. OS/2 was merely one part … Continue reading →

Posted in IBM, Microsoft, OS/2, PC history | 27 Comments

64-bit trouble with Solaris 10 U4 and earlier

Posted on March 26, 2012 by Michal Necasek

On many newer systems, Solaris 10 releases up to and including Solaris 10 8/07 (that is Update 4, also known as S10U4) behave in an unhelpful manner. The installer can be launched from CD or DVD and the system can be … Continue reading →

Posted in Solaris, x86 | 12 Comments