nesdev.org

cartlemmy

I've been at this for the last week or so, and I finally got a .NES file that does something. I've created a map editor and a metatile generator, and a NES rom that shows the first part of a map. I made it so that it can load a column of metatiles in at a time. There's a lot of temporary code in the...

cartlemmy

clrmem: LDA #$00 STA $0000, x STA $0100, x STA $0200, x ;Isn't this sort of redundant, since we are setting it to #$FE later? Or am I missing something? STA $0400, x ; [...] LDA #$FE STA $0200, x INX BNE clrmem I'm pretty sure the first instance of $0200,x is a typo for $0300,x. Where did you find ...

cartlemmy

Damn admin faeries, they ruin everything.

Seriously though, it's good to see an explanation for down time. This is quickly becoming my favorite message board.

cartlemmy

Thanks Blarrg, that's what I was looking for.

cartlemmy

One more question (in comments).

Code: Select all

clrmem:
	LDA #$00
	STA $0000, x
	STA $0100, x
	STA $0200, x ;Isn't this sort of redundant, since we are setting it to #$FE later? Or am I missing something?
	STA $0400, x
	STA $0500, x
	STA $0600, x
	STA $0700, x
	LDA #$FE
	STA $0200, x
	INX
	BNE clrmem

cartlemmy

Yeah, I don't have a problem with optimizations in tutorials, as long as there is an explanation. Thanks for the info Blargg.

cartlemmy

Thanks guys, you're awesome!

cartlemmy

There were a few instructions of the init code that I wasn't sure about, and I was hoping someone could give me some insight. Reset: SEI CLD LDX #$40 STX $4017 LDX #$FF TXS ; I'm not sure why this is done, are we manually resetting the stack? can someone give me a hint? INX ; Increments X, which rol...

cartlemmy

Ah, thanks. I hate it when things are seemingly arbitrarily named, I always want to know why things are called what they are. Thanks for the help guys.

cartlemmy

What does the N, CN, and UN stand for?

Is this http://everything2.com/title/NROM a good explanation of what they are?

cartlemmy

Awesome, this is the exact post I was looking for a few days ago. Thank you!

cartlemmy

This web site is does not contain an RSS feed. That is entirely your choice. However, your content (is it a blog?) would be easier to follow (track updates on) if it were an RSS feed, or would at least be recognized by the google rss reader. Just my $0.02. I did not intend on releasing it as a blog...

cartlemmy

Kasumi wrote:6502 CPUs can multiply and divide and quite fast actually, but only by two. (and powers of two by extension).

Ah good point, bitwise shifts, correct? I guess I should mention that

cartlemmy

Cool, thanks for the extra input I'll definitely give NESASM a look as well.

cartlemmy

I just wanted to let you all know that I will be chronicling my adventures in NES development, and hopefully when all is said and done the document will be useful to someone. I was also wondering if anyone could help me be reading it over for inaccuracies.

http://www.yibbleware.com/nes/

nesdev.org

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Init Code Questions

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NES Development - A nOOb's Perspective