Category Archives: IBM

Playing Football

The Super Bowl is long over and it’s time to look at different kind of football. In Winter 1986/1987, Microsoft initiated a small skunkworks project called “Football”. The objective was to take “Sizzle”, a development branch of proto-OS/2 that would eventually … Continue reading

Posted in 386, IBM, Microsoft, OS/2, PC history | 17 Comments

Before OS/2 Was OS/2

After almost 30 years, several disks with ancient builds of OS/2 surfaced. In this context, “ancient” means older than the May 1987 release of the first MS OS/2 SDK. In fact these disks are so old that the one thing … Continue reading

Posted in IBM, Microsoft, OS/2, PC history, Undocumented | 36 Comments

More ISA VGA Benchmarks

After establishing that Trident VGA cards are indeed very slow, the natural follow-up question is: Are there cards even slower than that? But not some 8-bit VGA card from the 1980s (or a Realtek from the 1990s), and not some … Continue reading

Posted in Cirrus Logic, IBM, S3, VGA | 7 Comments

IBM XENIX: One Step Forward, One Step Back

A while ago I wrote about why IBM PC XENIX 1.0 can’t work on any CPU other than a 286. But not content to leave well enough alone, I attempted to patch this version of XENIX so that it would … Continue reading

Posted in 286, 386, IBM, VirtualBox, Xenix | 5 Comments

The DOS 4.0 Shell Mouse Mystery

Several years ago, I noticed that in some virtual and physical environments, the DOS Shell in both IBM’s and Microsoft’s DOS 4.0x has a very odd glitch: the mouse pointer moves, but does not register any clicks… except on scroll … Continue reading

Posted in DOS, IBM, PC hardware, PC history | 25 Comments

ThinkPad 701 Restore Using CF Media

Thanks to a kind reader, the OS/2 Museum obtained a file archive of the ThinkPad 701 recovery CD. The 701C/701CS was also known as Butterfly thanks to its unique folding keyboard. The recovery tool appears to have been designed for … Continue reading

Posted in IBM, ThinkPad | 22 Comments

IBM Blue Lightning: World’s Fastest 386?

One of the OS/2 Museum’s vintage boards is a genuine Made in U.S.A. Alaris Cougar. These boards were produced by IBM for Alaris and are a bit unusual: There’s a small IBM DLC3 processor in plastic package soldered on board, … Continue reading

Posted in 386, IBM, Intel, PC hardware, PC history | 31 Comments


An interesting question recently popped up: How exactly did IBM build the ROM BIOS for the IBM PC? Knowing what tools were used should make it possible to use the ROM listing published in the IBM PC Technical Reference and … Continue reading

Posted in BIOS, IBM, Intel, PC history | 44 Comments

IBM Power Series Exotica

One might think that for example a ThinkPad Power Series 850 is an uncommon system, but such things are relative. The OS/2 Museum recently learned of not just one but two very rare Power Series systems, one of which is virtually a … Continue reading

Posted in IBM, PowerPC | 7 Comments

IBM OS/2 1.0 in a VM

As previously mentioned, IBM’s OS/2 1.0 and 1.1 is extra unfriendly to modern hypervisors. To recap, there is a curious difference between IBM’s and Microsoft’s kernels in OS/2 1.0/1.1 with regard to mode switching. For reasons that aren’t very clear, … Continue reading

Posted in IBM, Microsoft, OS/2, VirtualBox, Virtualization | 35 Comments