Writing a NES game day 11, Fire!

Now that I have my first version of the character, and he can move, I need to make him so something else. Remember that you can check the status of the code in my github repo.
I created a simple sprite for bullet which is a 2 colors circle (redoing sprites into something better is a problem for future me) and created 3 variables for this: sx (shoot in x axis), sy (shoot in y axis) for the position of the shoot every frame and a shootStatus to see if it is actually firing something or not (maybe in the future I can delete this variable and use a special value in sx and clean 1 byte?)
For making this work, I added the shoot behaviour to button B in the engine sector:

bButton: CMP #%01000000 BNE bDone LDA #$01 STA shootStatus LDA p2x STA sx LDA p1y STA sy bDone: 

After that, I see if the shooting is active and I jump to a shooting "function"

;Shooting update LDA #$01 CMP shootStatus BNE :+ JMP shoot : 

And then the shoot part:

shoot: ;for now it will only shoot to the right. LDA sx CLC ADC #01 STA sx RTS 

As you can see I place a lot of comments, the code in assembly is not that "self readable" as other languages.

Now, I have to update the sprites refresh to make all this visible.

LDA sy STA $0210 LDA sx STA $0213 LDA #$00 STA $0212 LDA #$01 CMP shootStatus BEQ isShooting LDA #$FC STA $0211 JMP shootDone isShooting: LDA #$30 STA $0211 shootDone: 

As it is a one tile sprite, I only need 4 positions in memory, so I assigned it the $0210 to $0213 space.

(tomorrow we will talk about the other thing that appears on the screen)

On the other hand, to keep me MORE motivated I am playing some nes games lately. Not only Final Fantasy in japanese to learn, but I started Rockman (Megaman)

If you have a child that loves video games, show them the old Nintendo games, for them this all will be in nightmare level.