综合技术 2018-08-31

The History of a Security Hole

Warning: If you do not care for the finer points of x86 architecture, please stop reading right now—in the interest of your own sanity. A while ago I was made……
科技动态 2018-08-15

A Sound Card Before Its Time

A mysterious full-length sound card recently arrived at the OS/2 Museum. It was clearly manufactured by IBM in 1985, and sports a 20 MHz Texas Instrument TMS3……
手机数码 2018-07-23

How Fast Is a PS/2 Keyboard?

A few weeks ago, an interesting question cropped up: How fast is a PS/2 keyboard? That is to say, how quickly can it send scan codes (bytes) to the keyboard c……
科技动态 2018-06-15

A Brief History of Unreal Mode

After a run-in with a particularly crazy manifestation of unreal mode (Flat Assembler, or fasm ), I decided to dig deeper into the history of this undocumen……
移动互联 2018-04-28

Undocumented RDTSC

The other day I wrote a simple DOS program which used the RDTSC instruction in order to obtain precise time measurements (of how long it takes a PS/2 keyboard……
存储架构 2017-05-27

PC DOS 1.0, but Not Quite

Last week a most interesting image of a 160K disk arrived at the OS/2 Museum. The files on the disk image are rather old. When the disk boots up (not trivial,……