Author Archives: Michal Necasek

LAN Manager 2.0 Primary Domain Controller

Posted on April 11, 2019 by Michal Necasek

While messing around with late 1980s and early 1990s networking software, I had the need to switch a LAN Manager 2.0 server to the primary domain controller role, so that it could run the Netlogon service and I could use … Continue reading →

Posted in LAN Manager, Microsoft, Networking | 3 Comments

Kryofluxing PC Floppies

Posted on March 16, 2019 by Michal Necasek

Last year I finally bought a Kryoflux, unfortunately in the middle of moving house. Now I’m finally able to use it beyond verifying that it’s not completely broken. After imaging a few dozens of floppies, I can say one thing–Kryoflux … Continue reading →

Posted in Floppies, Kryoflux, PC hardware | 11 Comments

Small World

Posted on March 3, 2019 by Michal Necasek

The core of this story was originally a private e-mail, but I realized that it’s worth sharing with a slightly wider audience. Readers may know that I’m very interested in the history of PC development tools, especially C compilers, and … Continue reading →

Posted in PC history, Watcom | 16 Comments

Reading From Void

Posted on February 21, 2019 by Michal Necasek

Recently I came across the following question: What happens when software reads the registers of a non-existent IDE controller? That is, what happens when software reads for example ports in the 1F0h-1F7h/3F6h range (primary IDE channel) when there is no … Continue reading →

Posted in BIOS, IDE, PC hardware | 10 Comments

Ancient NetWare OS/2 Requesters?

Posted on February 16, 2019 by Michal Necasek

Quite a while ago there was a discussion on this site about NetWare support for OS/2 versions prior to 1.3. Finding reliable information is difficult, especially when one doesn’t know exactly what to look for. Spurred by the discovery of … Continue reading →

Posted in NetWare, OS/2, PC history | 13 Comments

Historical ATA Standard Drafts

Posted on February 12, 2019 by Michal Necasek

After some digging, I discovered that several old drafts of the original ATA standard (later known as ATA-1) have been out in the public all along, or at least for a very long time, cleverly hiding among hundreds of SCSI-related … Continue reading →

Posted in IDE, PC history, Storage | 15 Comments

NetWare 3.12 vs. Large IDE Disks

Posted on February 1, 2019 by Michal Necasek

Recently I had an occasion to find out why NetWare 3.12 using the shipped IDE driver (IDE.DSK) behaves, very, very strangely when let loose on disks bigger than about 500MB (a very foolish thing to even try). The driver loaded … Continue reading →

Posted in Bugs, IDE, NetWare, PC history | 46 Comments

Fox in the Crypt

Posted on January 19, 2019 by Michal Necasek

Some time ago I wrote a bit about examining the “branding” system which was used by XENIX and other SCO products and based on the crypt() UNIX library function. At the time I assumed that only SCO had used this … Continue reading →

Posted in PC history, SCO, Software Hacks, Xenix | 3 Comments

Yep, Norton Did It

Posted on January 12, 2019 by Michal Necasek

Some time ago, the question of the oldest executable compression tool came up. EXEPACK was identified as a widespread and unexpectedly troublemaking specimen, but Realia SpaceMaker was reportedly older. Only initially no one could come up with surviving executables compressed … Continue reading →

Posted in Compression, PC history | 6 Comments

My Second AMD

Posted on December 13, 2018 by Michal Necasek

A few weeks ago I became a happy owner of a ThinkPad A485, the first ThinkPad (together with the E485 and related variants) to use an AMD CPU. History buffs will know that it’s far from the first ThinkPad with … Continue reading →

Posted in AMD, PC history, ThinkPad | 39 Comments