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Showing posts from August, 2016

Atari vs NES

It's really interesting to me the differences and similarities between Atari and NES programming. They both use the same 6502 processor (well, a variation on the same processor -- the Atari's is missing a few address lines, and the NES is missing a BCD mode), clocked at similar speeds (the nes is about 50% faster).

But beyond that, things start to diverge.  The most interesting to me is fundamentally where things happen, based on how their video chips work.

On the Atari, the video chip (the TIA) is designed to handle a scanline at a time. Which means that, like I've mentioned before, the whole time your TV is drawing, you spend that time babysitting the process, using all your processing time updating each scanline.  Then during vblank (the time the TV is repositioning the electron beam), you get to hurry and do your game logic updates.

On the NES, it's practically the opposite. The video chip (the PPU) is designed to handle a whole frame at a time (GASP!).  So during…

NES Game and LiveCoding

Well, I started messing around with making a NES game. I'm not sure I'm ready to tackle another big project right now, and there's still bits of work to be done with Atari Anguna (mostly fixing bugs as they get reported, then getting it ready for production), so I'm doing a little project:  sort of a simple 4-player space race game.



The fun part is that I thought I'd try LiveCoding it, which is basically where you live stream yourself writing code and explaining it as you do.  I've tried this for the past 3 nights.  It's a really weird experience.

First, I don't know why anybody would want to watch someone code. I mean, at least watching someone stream video games is interesting because there's a lot of action. Coding is mostly thinking and typing.

Second, it's REALLY HARD.  Now I'm trying to do all my thinking out loud. Which is a really weird process.  Everything feels blurry and sluggish in my head. I feel like I'm not coding well, an…