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1/ Here's one for the "MAME arcade progress peaked with 0.36" crowd: Until about half an hour ago, MAME handled sprite drawing incorrectly in the Capcom classic, 1942. This bug was present from day one.pic.twitter.com/HX2i5rvR5w
2/ Notice the expanding box at the bottom of the title screen, as well as the Capcom logo expanding outward from the center of the screen. This is the correct behavior. In existing releases of MAME, you'll instead see two separate boxes moving back and forth.
3/ This is because for years, MAME assumed that all 32 sprites are processed on every scanline. Not so. 0 to 15 are always processed, then 16 to 23 only on the left (top) half of the screen, and 24 to 31 only on the right (bottom) half.
4/ In retrospect, this makes perfect sense: There are 384 horizontal clocks per scanline in 1942, and a 6MHz pixel clock, producing a scan rate of 15.625kHz - entirely typical of the era. But each sprite takes 16 clocks to process. They literally can't process all 32 in a line.
5/ An aside: This was only discovered by pure happenstance when a dev was watching someone's repair video for a faulty 1942 board. This bug has been so ever-present that MAME's bugged behavior is recreated in the JAKKS Pacific "TV Plug and Play" version of 1942.
6/ This is why having actual working boards and footage of said working boards is so critical: When nobody knows that a given behavior in MAME is incorrect, people can inadvertently use potentially incorrect behavior as a reference for recreations - the total antithesis of MAME!
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