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AndrewC

@achadwick.ohai.social.ap.brid.gy

Bike geek and computer toucher living in Oxford, UK. Will boost puns. Inception date 1976, fediverse since 2016. Alt: en.osm.town/@achadwick Originally […] 🌉 bridged from ⁂ ohai.social/@achadwick, follow @ap.brid.gy to interact

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AndrewC @achadwick.ohai.social.ap.brid.gy · 10/04/2026

Really liked this neat blog post by Alexander Grupe about why Amiga ProTracker sometimes displays stale data from previous patterns at its highest playback speed. Thanks, RSS feed! heckmeck.de/blog/not-so-fast-protra… #RetroCompting #ProTracker #Amiga

Image from the article. Two views of the main note entry and playback head part of ProTracker on two successive screen frames at maximum speed, so that one row is advanced per frame. It's running on real hardware. The pre-rendered pattern data ahead of the fancy playback bar is stale in the first pic, but has been updated in the second.

The article goes into why and how it does the pre-rendering (font rendering = slow on an A500, basically, but drawing a bitplane from chip ram = fast).

I always liked the way it rendered the patterns back in the day, and wondered how it drew them. And now I know, more than I'll ever need practically. Yay!

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AndrewC @achadwick.ohai.social.ap.brid.gy · 08/02/2026

I made more things! github.com/PapirusDevelopmentTeam/p… #PICO8 #TIC80 #Papirus #IMadeThis

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