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Explanation for "Copper not draining" serial debug message (that does not appear in emulation, for obvious reasons): Copper is not working.
"Dancing April Fool's GFXLIB" creates single-move copper list that should clear copper dma bit in DMACON. If bit does not clear after short CPU delay, "Copper not draining" is written to serial port, GFXLIB init is aborted, screen stays black (instead of showing green on black garbage..)
Probably not the only chip bug in prototype chips.
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