Bandai 2001

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The Bandai 2001 (LUXSOR) is one of the two mappers used in WonderSwan cartridges.

In addition to the normal Mapper banking interface, Bandai's 2001 adds three registers for interacting with a Microwire EEPROM:

Category Port Description Bits Type Notes
External EEPROM $C4 External EEPROM Data dddd dddd dddd dddd RW16 Data (d)
$C6 External EEPROM Command 0001 CCaa aaaa aaaa
or 0000 01CC aaaa aaaa
or 0000 0001 CCaa aaaa
RW16 Command and address
$C8 External EEPROM Command ASWR .... W8 Abort (A), Short (S), Write (W), Read (R)
External EEPROM Status .... ..rd R8 Ready (r), Done (d)

EEPROM

The 2001's EEPROM interface is similar to the internal EEPROM interface, as documented on the EEPROM page. Differences include:

  • Instead of the internal EEPROM interface's P(rotect) bit, the A(bort) bit is provided. When the A bit is set, the transaction immediately stops.
  • The EEPROM "done" bit is buggy and doesn't have useful information. It's set when a Read completes, but is only cleared when a Command or Write is started. (To be useful it would need to also be cleared when a Read is started).

(Upload logic analyzer traces here)