Sunday, September 10, 2006

What and why is D5AA96?

In the past 3 months, the last one of the top-10 keywords that had brought visitors to my blog via Google is "D5AA96". It shows that some people are still interested in this strange string. Do you know what it is?

My blog post, Happy Birthday Apple!, has given a brief technical explanation, as well as its special meaning for me and my teenage buddies: "... and $D5AA96 header for identifying a disk sector. The $D5AA96 even became the secret code and the lingo word for us to seek for other Apple fans in the city!"

Literally, D5AA96 is a hexadecimal number. For Apple II systems, it is a three-byte header identifying the begining of a floppy sector from the raw bit stream read from the floppy surface by DOS 3.3's RWTS routine, the low-level disk driver of the Apple II+/e's operating system, to locate disk sector after addressing the start of a disk track by FFFFFF header.



Unknown said...

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