Casio BN-10 Service Manual & Parts List page 53

Memory block (PCB ASSY-A241123)
ROM IC320 IC321 R330 LSI308
MASK ROM not used not used used not used
FLASH ROM used used not used used
Unit's Name LSI304 LSI306 R335 R336
BN-10 used not used not used not used
BN-20 used used used not used
At first FLASH ROM will be used, then MASK ROM will be used.
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