Category Archives: IBM

The Future That Never Was

Microsoft OS/2 2.0 SDK Pre-Release 2, June 1990 In 1990, the strategic PC operating system of Microsoft and IBM was not DOS, not Windows, but OS/2. The first 16-bit OS/2 was initially released in 1987 with a reduced feature set, … Continue reading

Posted in 386, IBM, LAN Manager, Microsoft, OS/2, PC history, Pre-release | 75 Comments

Retro-Porting to OS/2 1.0

A few weeks ago I embarked on a somewhat crazy side project: Make the Open Watcom debugger work on OS/2 1.0. This project was not entirely successful, but I learned a couple of things along the way. The Open Watcom … Continue reading

Posted in Development, IBM, Microsoft, OS/2, Watcom | 10 Comments

First ROM Shadowing

The other day I was asked an interesting question: What was the first BIOS with support for ROM shadowing? In the 1990s, ROM shadowing was common, at first as a pure performance enhancement and later as a functional requirement; newer … Continue reading

Posted in C&T, Compaq, IBM, PC architecture, PC history | 55 Comments

Learn Something Old Every Day, Part VII: 8087 Intricacies

The other day I investigated a report that a C runtime library modification causes programs to hang on a classic IBM 5150 PC with no math coprocessor. The runtime originally contained two separate routines, one to detect the presence of … Continue reading

Posted in 8086/8088, Development, IBM, Intel, PC history, x87 | 10 Comments

PC Disk Sector Sizes and Booting

Everyone knows that the IBM PC established 512-byte sectors on floppies and hard disks as the standard, which survived for several decades until the advent of “native” 4K-sector drives. Of course what “everyone knows” is not necessarily the whole story. … Continue reading

Posted in BIOS, DOS, IBM, PC history, Storage | 15 Comments

IBM AIX for IA64 (Itanium) aka Project Monterey Runs Again!

(This is a guest post by Antoni Sawicki aka Tenox) Project Monterey was an attempt to unify the fragmented Unix market of the 90s in to a single, cross vendor Unix OS that would run on the upcoming Intel Itanium … Continue reading

Posted in IBM, Intel, SCO, UNIX | Tagged , , , , , , , | 11 Comments

Slovenian OS/2 Warp 4

This is a guest post written by Marko Ć tamcar from the Slovenian Computer Museum in Ljubljana. Additional context and commentary from the OS/2 Museum can be found at the end of the article. Slovenia being a tiny country with a … Continue reading

Posted in IBM, OS/2, PC history | 15 Comments

Learn Something Old Every Day, Part V: Early IBM PS/2 Hard Disks

So I have been (again) trying to properly archive old MS OS/2 SDKs. The version 1.02 SDK from December 1987 (corresponding to OS/2 1.0) turned out to be a bit of a poser. The SDK came on both 3.5″ and … Continue reading

Posted in ESDI, IBM, PC history, PS/2 | 16 Comments

OS/2 6.304: Finally Complete

Some time ago, I lamented that even though the OS/2 Museum had a good number of disks of the final OS/2 2.0 beta, level 6.304, there wasn’t enough to install the OS, let alone any of the development tools or … Continue reading

Posted in CD-ROM, IBM, OS/2, PC history, Pre-release | 5 Comments

Page Too Big

The other day I was able to look at an IBM OS/2 pre-release CD-ROM from early 1992. The CD-ROM appears to have been produced by IBM UK under the DAP (Developer Assistance Program) umbrella. The CD-ROM contains about 250 MB … Continue reading

Posted in Documentation, IBM, OS/2, PC history | 4 Comments