this is a super-silly question, but I will ask it nevertheless.
I see that the TextureFactor allows blending, given in percentage.
What I do not understand is the number system:

TextureFactor = 0x00202030

Can anybody explain how I could interpret this, or - the other way round, transform a simple int number like 77 into a valid asm expression?

The number is simply in hexidecimal. You can find plenty of different converters online I'm sure (or learn to do it yourself, working in hex is a pain).

-Rhuarc