EDASS-128-THE-OPPOSITE-SIDE-EXTENDED
--------------------------------------------------------------------------------------------------
TOOL: 		EDASS-128 {Commodore C128 EDITOR & ASSEMBLER}
Language: 	Assembler 
Extra:		-
Author: 	Misel Zivanovic
Note:		(C) 13th JULY 2026  - www.lived.ch, mzretro.ch
---------------------------------------------------------------------------------------------------

What is this code doing?

Being NEGATIVE, doesn't always need to mean to also be BAD, right!
Recently i had to make a big text characters, you know, something like that:

aa  aa  aaaaaa  aa      aa      aaaaaa
aa  aa  aaaaaa  aa      aa      aaaaaa
aa  aa  aa      aa      aa      aa  aa 
aaaaaa  aaaaaa  aa      aa      aa  aa
aaaaaa  aaaaaa  aa      aa      aa  aa
aa  aa  aa      aa      aa      aa  aa
aa  aa  aaaaaa  aaaaaa  aaaaaa  aaaaaa
aa  aa  aaaaaa  aaaaaa  aaaaaa  aaaaaa

And then i thought it would be nice to have this also in inverse!
Can't be so difficult to do it in assembler. I had something similar done in COMAL-80
Well, I quickly put this together, and guess, it's working!

You are right, there are other ways to do this, but why sweat unnecessary.
I just need it for the text size of 12 lines, not the whole screen.

You are free to extend it as you wish or even add more functionality.
Should not be a problem if you have followed all previous lessons until here!

---------------------------------------------------------------------------------------------------
11:30 13.07.2026, SERIOUS UPDATE, haha...
---------------------------------------------------------------------------------------------------
Maybe you have already seen it, and then, maybe you didn't.
In Machine-Language Monitor section, I already made a basic version of this code below.
Here, i wanted to extend it a bit.

Why EDASS-128 and not directly in built in ML-Monitor of Commodore C128?

Well, because it's much easier to make changes especially if the code is a bit larger than a screen
or just going over 25 lines! Adding more functionality is easier! 
And on top of that, you can assemble it to any location you need.
---------------------------------------------------------------------------------------------------


EDASS-128 Assembly Source Code
---------------------------------------------------------------------------------------------------

opposite00.asm     -a:0011-a:    -e:
;---------------------------------------
;
;        the opposite side extended
;        inverse your world!
;
         *=  $1300
         .obj m
         .bank 15
;
;---------------------------------------
         ldx #$00
 loop    lda $0400,x
         cmp #$20
         beq one
         lda #$20
         sta $0400,x
 backone lda $04f0,x
         cmp #$20
         beq two
         lda #$20
         sta $04f0,x
 backtwo inx
         cpx #$f0
         bne loop
         rts
 one     lda #$06
         sta $d800,x
         lda #$a0
         sta $0400,x
         jmp backone
 two     lda #$06
         sta $d8f0,x
         lda #$a0
         sta $04f0,x
         jmp backtwo
---------------------------------------------------------------------------------------------------