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 Control | 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)
