GoodMSX ROM is a good dump.

PCB:
http://home.planet.nl/~haps/crap/crossblaim_front.jpg
http://home.planet.nl/~haps/crap/crossblaim_back.jpg

Info:
bankswitch address range: $0000-$FFFF
xxxxxxrb: x=don't care, r=rom, b=bank
page 1 always fixed to ROM 0, if ROM 0 is switched in, upper bank is always in page 0, 2, and 3.

All possibilities:

00/01:
$0000-$3FFF = upper 16KB of ROM 0
$4000-$7FFF = lower 16KB of ROM 0
$8000-$BFFF = upper 16KB of ROM 0
$C000-$FFFF = upper 16KB of ROM 0

10:
$0000-$3FFF = unmapped ($FF)
$4000-$7FFF = lower 16KB of ROM 0
$8000-$BFFF = lower 16KB of ROM 1
$C000-$FFFF = unmapped

11:
$0000-$3FFF = unmapped
$4000-$7FFF = lower 16KB of ROM 0
$8000-$BFFF = upper 16KB of ROM 1
$C000-$FFFF = unmapped

power-on state is 00


While messing around (ejecting/inserting the cartridge when the MSX was on), the game once treated me with the ending pic/scrolltext, funny