nesdev.org

You don't need to use PHA to assemble the loop. You could use absolute,X addressing, for example. The nice thing about a stack-sourced blitter is that it's general purpose, and could be reused for multiple different buffers. The entry point and value of S when you start exactly determine which and ...

PLA means pull value from stack into accumulator, so I'm guessing that example would have involved pushing (PHA) the values onto the stack first. I just have to ask because this example made me wonder. You're pulling values from the stack and writing them to the PPU, so you're inside of NMI, however...

Hopefully somebody will correct me if I'm wrong, but I believe it's when, instead of creating a loop that performs a repeated task multiple times for multiple pieces of data, you essentially lay out each cycle of the loop as it's own step. This takes a lot more space, is a lot less maintainable, is ...

Have you seen this handy reference?

http://wiki.nesdev.com/w/index.php/PPU_ ... _reference

Hey your work looks really good. It looks like you've been working on these for quite a while. Curious why you're just now getting around to putting your work into a real game. You obviously have a passion for it. The designs I saw look like SNES. Do you have anything 8-bit style? Although doing SNE...

You're in for a surprise if you think R-Type is easy... This. R-Type routinely gets pegged as the HARDEST in the genre. Those little speed powerups, the "bits" that sit above and below your ship, and the force powerups, you NEED those. I've talked to people who say Gradius is more lenient...

Howdy! I have a question. How do you guys tend to position your metasprites in relation to your character X,Y position? It seems like there would be advantages and disadvantages to each. If your x position is in the center, then character flipping is much easier. If your x position is on the left, t...

I ran into this as well. What I did was shorten my code if possible. I'm guessing you want to save what's in your accumulator instead of moving your X register into it. Have you thought about pushing A to your stack, adding 128, then pulling A back? PHA TXA CLC ADC #$80 TAX PLA INX requires 2 clock ...

I'm not so fond of vertical shooters. I prefer the horizontal ones. I felt the same way until I found a few that I liked. Have you tried Recca? My first Shmup was R-Type on SMS when I was quite young. Ever since then I'd been a fan of the genre and of IREM. Have you ever tried a Danmaku shooter? If...

I really feel like there are a lot more examples but most of them are for top-down games I recall areas in Seiken Densetsu III where wind is blowing really hard in one direction preventing you from walking against it. You have to flip switches to change the angles of the wind generators. If you can ...

I like "Over Horizon". It's "Gradius" done right. Unfortunately we didn't get that one the in US. We didn't get a lot of great Shmups, like Crisis force and Gradius II. Ever play Gun-Nac? I think I have to give that one the title of best US NES Shmup, although Zombie Nation is r...

I know I've seen this but I'm having trouble coming up with too many examples.

Metal Storm has floors that you can only jump through in one direction.

If I remember correctly, this little windows game we had at school called Chip's Challenge had floors like you described from a top down view.

Can you just imagine how things were before the internet? These days it seems like people want everything to be handed to them in a silver platter. Well, back in the 80's and 90's people didn't have video tutorials on YouTube detailing every little thing they had to do and somehow people still mana...

Obvious troll is obvious. I'm really not trolling. I think the game is charming. I also think Zombie Nation is the second best shmup on the NES in the US. I don't know why people like to hate on it. It has bi-directional scrolling with a ton of stuff going on, the story and visuals are highly enter...

How about Bird Week?