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JWallace |
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Steamrollered by cool things, and likes it that way
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Reged: 09/22/03
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Posts: 810
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Re: DU: (Atari ?) Tetris bootlegs
10/02/18 12:24 PM
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Looks like it's a mask ROM holding the frequency data, as you can set it up to one of three 'instruments', but it only holds 512 notes in total.
I think there's a lookup table for which notes belong to which song internally, as the implication of the datasheet is that the versions with fewer songs have each one being longer. There's a video out there that shows it working, looping through the stored data.
The datasheets are out there, such as they are, and it's a pretty simple IC.
EDIT: Just to mention, in the past when I looked into sheet music for this, the only one I couldn't find was simply referred to as 'Rabbits' - which I have to presume is not its real name.
http://agemame.mameworld.info
AGEMAME HQ - was once a thing, now isn't really.
Edited by JWallace (10/02/18 12:47 PM)
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