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Understood!

What is more efficient; to have many RTS on the same subroutine, or just having 1 at the end and many JMP to a label just before that RTS?

I am using NESASM3 as compiler, is there any different between labels like:

CMP #$00
BNE LabelNoPeriod
...
...
LabelNoPeriod:

V.S.

CMP #$00
BNE .next
...
...
.next

just curious about it.

Thanks Rainwarrior, I just implemented this at it work great!

That site is just what I was looking for, thanks!!

I meant the gray shells for the games. And maybe empty boards to burn a new one.

I have a db(s) of my backgrounds (rooms) like this: rooms_db: .word Room0, Room1 where Room0 is simply like: Room0: .db $27,$27,$27,$27,$27,$27,$27,$27,$27,$27, etc. Room1: .db $27,$27,$27,$27,$27,$27,$27,$27,$27,$27, etc. I cannot make work my load background routine from those pointers in rooms_db...

Is it possible to buy empty NES Shells and how about boards?

Thanks!

What options do I have to test on real hardware? I have seen the PowerPaK and the EverDrive, just wondering what is recommended before I shell out the cash.

What is the standard process to update just some of the background tiles? Say the score or remove a door, open a status panel etc.

Unrelated to the problem you're having but just thought I might point out: LSR A LSR A LSR A LSR A ; / 16 ASL A ASL A ASL A ASL A ; * 16 Is equivalent to: AND #$F0 (Except for failing to clear the carry flag, of course, but that's not relevant here.) Great tip rainwarrior!! I just implemented that,...

Made it work like this; by adding 1 to y before the formula, I was actually expecting to subtract 1 given that rendering thing works... ; To calc index in .db array do... ;(SpriteY ( + 1 ?) / 8) * 32 + (SpriteX / 8) ; NEW ATTEMPT LDA object_y CLC ADC #$01 ; Sprites are drawn one scan lower than the ...

Well that is new knowledge for me, I will account for that, thanks!

I have been having a small issue with this; might collisions against left and right of a tile are perfect, but I have a weird offset when up and down, see the images: http://i68.tinypic.com/2drcnjr.png http://i68.tinypic.com/2drcnjr.jpg http://i66.tinypic.com/2n024vp.jpg This is my code; CalculateTi...

Thanks!