EXAMPLE:

Let us suppose that location $02 contains $45, and location $03 contains $1E. If the instruction to load the accumulator in the indirect indexed mode is executed and the specified zero page address is $02, then the actual address will be:

   Low order = contents of $02
   High order = contents of $03
   Y register = $00

Thus the actual address = $1E45 + Y = $1E45.

The title of this mode does in fact imply an indirect principle, although this may be difficult to grasp at first sight. Let's look at it another way:

"I am going to deliver this letter to the post office at address $02, MEMORY ST., and the address on the letter is $05 houses past $1600, MEMORY street." This is equivalent to the code:

   LDA #$00      - load low order actual base address
   STA $02       - set the low byte of the indirect address
   LDA #$16      - load high order indirect address
   STA $03       - set the high byte of the indirect address
   LDY #$05      - set the indirect index (Y)
   LDA ($02),Y   - load indirectly indexed by Y

INDEXED INDIRECT