Bandai 2001: Difference between revisions
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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: | In addition to the normal [[Mapper]] banking interface, Bandai's 2001 adds three registers for interacting with a Microwire EEPROM: | ||
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! Notes | ! Notes | ||
|- | |- | ||
! rowspan=" | ! rowspan="5" | External EEPROM | ||
! $C4 | ! rowspan="2" | $C4 | ||
| External EEPROM Data | | rowspan="2" | External EEPROM Data | ||
| style="text-align: right" | <tt style="white-space: nowrap">dddd dddd dddd dddd</tt> | | rowspan="2" style="text-align: right" | <tt style="white-space: nowrap">dddd dddd dddd dddd</tt> | ||
| | | R16 | ||
| Data (d) | | Data read (d) | ||
|- | |||
| W16 | |||
| Data to write (d) | |||
|- | |- | ||
! $C6 | ! $C6 | ||
| External EEPROM Command | | External EEPROM Command | ||
| style="text-align: right" | <tt style="white-space: nowrap">0001 CCaa aaaa aaaa</tt> | | style="text-align: right" | <tt style="white-space: nowrap">0001 CCaa aaaa aaaa</tt><br/>or <tt style="white-space: nowrap">0000 01CC aaaa aaaa</tt><br/> or <tt style="white-space: nowrap">0000 0001 CCaa aaaa</tt> | ||
or <tt style="white-space: nowrap">0000 0001 CCaa aaaa</tt> | |||
| RW16 | | RW16 | ||
| Command and address | | Command and address | ||
|- | |- | ||
! rowspan=2|$C8 | ! rowspan=2|$C8 | ||
| External EEPROM | | External EEPROM Control | ||
| style="text-align: right" | <tt style="white-space: nowrap"> | | style="text-align: right" | <tt style="white-space: nowrap">ASWR ....</tt> | ||
| W8 | | W8 | ||
| Abort (A), | | Abort (A), Short (S), Write (W), Read (R) | ||
|- | |- | ||
| External EEPROM Status | | External EEPROM Status | ||
| Line 36: | Line 40: | ||
|} | |} | ||
== EEPROM == | |||
The | The 2001's EEPROM interface is similar to the internal EEPROM interface, as documented on [[EEPROM#I/O_ports|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) | (Upload logic analyzer traces here) | ||
Latest revision as of 08:24, 16 March 2025
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 | R16 | Data read (d) |
| W16 | Data to write (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)
