TechHELP! (233K) (C) - Everything you want to know about BIOS, DOS and your computer. Hypertext DOS-based helpfile. Resembles Assembly Handbook (see above).
Assembler Tutorial (120K) - A 1996 edition of Assembler Tutorial from Hugo Perez Perez of University of Guadalajara. This is great stuff for those who wish to learn what Assembler is, how to assemble or how DEBUGger works...
It is not less important to know where you can find some great stuff about programming, and stuff, which can help you to program. Here it is!