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After my Ikea-clock 'gameboy mod, I switched to a software solution : https://github.com/pixjuan/clockboy You can flash this into a cartridge and use it as an alarm clock, it will plays your favorite LSDJ chiptune! Code is provided as is, not very pretty since it is my first Gameboy project.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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screen rotation -> yes, it should be possible, I need to sort up my tiles any way ROM too big -> my first version in C was under 32K but had a really shitty music., what takes so much space in the current version is the music. I use https://github.com/jkotlinski/lsdpack, this tool plays LSDJ tunes through and emulator and dumps the registers into an asm file, that I include in my project.