nesdev.org

Get the hell out of here!?

What will you be doing there?

You should also check out Lance Leventhall's books.

I would try to get the 4th ed. of Rodney Zakks.

T

Thanks.

Where are you being deployed to?

T

Yup, the Rodney Zakks book, 4th edition. I've read that there were some errors and confusion in the previous editions, but the 4th ed. is good. Another good one I just received is "6502 Software Design" by Leo Scanlon. "Atari Roots" by Mark Andrews is a very good book for us begi...

This is a great forum. I learned a lot from the people here. I tested a rom I made using code that was pieced together from the input given to me in my posts (using the gamepad, etc.) Very inspiring to have something actually work on a real NES. Since my last post I've been reading some 6502 books a...

Wondering if there is another source for cart shells. Bought some from retrozone, nice products but no one answers your e-mail there and haven't received after 3 weeks.

Are there other sources for buying these?

Thanks,
T

I see. Thanks.

T

reset: sei ; ignore IRQs cld ; disable decimal mode ldx #$40 stx $4017 ; disable APU frame IRQ ldx #$ff txs ; Set up stack inx ; now X = 0 stx $2000 ; disable NMI stx $2001 ; disable rendering stx $4010 ; disable DMC IRQs I was wondering how x became zero in this bit of code. First x contains #$40 ...

I hear what you're saying. Not how to load numbers in the sound registers, but which numbers. And then what effect would those numbers have on each sound register. I have been wondering that too. It would be great to have a list of the effects that can be produced with each useful binary number on e...

While it seems like a neat and tidy way to do things, to zero memory at startup, you don't need to do that. Any memory you use you should initialize before use anyway. By zeroing memory you may just be helping yourself not realize you forgot to initialize a value before use or maybe you just enjoy ...

Thank you, very helpful.

T

I see why LDX must be outside the loop, the same number would constantly be loaded in the x register. Keeping LDA outside the loop doesn't effect the outcome, but does effect the time? (If it was outside the loop we would save time by not having to constantly load 0 in the A? Why do some people do t...

If you only want to clear a certain number of registers, you could do it that way, but just stick the lda #$00 and ldx "Desired Value" out of the loop, because they don't need to be in there. If you just stick lda #$00 out of the loop, it will save you a lot of time, because you only need...

Is there a better way to do this: txa ; x=0 clrmem: sta $000,x ; a = o sta $100,x sta $200,x sta $300,x sta $400,x sta $500,x sta $600,x sta $700,x ; Remove this if you're storing reset-persistent data inx bne clrmem why not just say; clearmem ldx with the number of memory registers you need to clea...

I thought it was a pretty good/quick description of some basic asm concepts which can be applied to the NES.

Might be helpful to some people:
http://alienbill.com/2600/101/03first.html


Tony

Ok, thank you.

I saw this tutorial onthe web where this guys was showing how to disable the cic chip inside the NES, rather than the cart.

I always thought that chip was in the NES system, I didn't expect to see the same chip inside the cart too.

I wonder why it's in the NES and in the cart?

Tony