How to decode 0F9h 1111 1001, 0FAh 1111 1010 and the like?

Question

assembler

I need to understand what it is in general
-0F9h 1111 1001
-0FAh 1111 1010
-0FBh 1111 1011
-0FCh
-0FDh
and where is the logic here?
what to read to understand what they mean?

Answer 1

0F9h

The hexadecimal code is probably the address of the cell in which the binary code is written:

1111 1011

What is written there? And hell knows.