Racing the Beam Explained - Atari 2600 CPU vs. CRT Television

What people said

ant6n · 2023-01 · Recommendation

Here’s a detailed video by retro game mechanics that shows how the logo graphics of the infamous E.T. game is rendered: [VIDEO] It seems incredible, very difficult. And remember, back then cartridges only had 8KB of memory. This means even more hacks are required, if your game needs more than a few levels. Theres a recurring hn post how jungle hunt encoded levels in a single byte (bitfield), then used some sort of sequence generator to allow going back and forth among the 255 levels.

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h3mb3 · 2022-07 · Recommendation

Keeping in mind how ridiculously primitive and cumbersome Atari 2600 was to program on, I think it's actually remarkable how functional E.T. is (adding in the time pressure and all). I never got around to read Racing the Beam [1] but Retro Game Mechanics Explained on YouTube has a good demonstration [2] on how the graphics programming seemed like a nightmare compared to later computers and game consoles. Just positioning things on screen required calculating machine cycles of other preceeding instructions. Refactoring must've been fun. [1] [LINK] [2] [VIDEO]

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dejobaan · 2025-05 · Reference

While I'm really happy we have faster systems now, there was something fun about about having to subvert constraints in games, and so satisfying and lovely when you did it right. HN folks are probably familiar with raster interrupts ( [LINK] ) and "racing the beam." I always associated this with the Atari 800. You weren't "supposed" to be able to do stuff like [LINK] , but Display List Interrupts made that possible. What I didn't know until recently was how much Atari 2600's games owed to this kinda of craziness: [VIDEO] It's stuff like this that makes me think that if hardware stopped advancing, we'd still be able to figure out more and more interesting stuff for decades!

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