Alternate MSX system ROM's:
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DISK.ROM     - Philips (original: Sanyo)
MSXKANJI.ROM - Uses more conventional RAM as the original
MSXJE.ROM    - Corrupted variant of MSX-JE/MSX-View (64KB)
MSXVIEW.ROM  - Corrupted variant of MSX-JE/MSX-View (32KB)
