Bandai 2001: Difference between revisions
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! $C6 | ! $C6 | ||
| External EEPROM Command | | External EEPROM Command | ||
| style="text-align: right" | <tt style="white-space: nowrap">0001 CCaa aaaa aaaa</tt> | | style="text-align: right" | <tt style="white-space: nowrap">0001 CCaa aaaa aaaa</tt><br/>or <tt style="white-space: nowrap">0000 01CC aaaa aaaa</tt><br/> or <tt style="white-space: nowrap">0000 0001 CCaa aaaa</tt> | ||
or <tt style="white-space: nowrap">0000 0001 CCaa aaaa</tt> | |||
| RW16 | | RW16 | ||
| Command and address | | Command and address | ||
| Line 27: | Line 26: | ||
! rowspan=2|$C8 | ! rowspan=2|$C8 | ||
| External EEPROM Command | | External EEPROM Command | ||
| 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 38: | Line 37: | ||
|} | |} | ||
== EEPROM == | |||
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 14:08, 28 May 2024
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)
