08 3WIRE

3WIRE Mode

This mode allows interaction with 3-wire EEPROM chips such as the 93C46/56/66/76/86 series. It supports both 8-bit and 16-bit memory organization depending on the ORG pin.

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🧩 Commands

Command	Description
eeprom	Launch an interactive EEPROM shell with 3WIRE EEPROM operations
config	Configure 3-wire pin mapping

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⚙️ EEPROM Shell

The eeprom command provides an interactive environment to explore, manage, and erase 3wire eeprom chips.

Actions

• 🔍 Probe – Detects the connected EEPROM, identifying size, organization (x8 / x16), and features.
• 📖 Read bytes – Reads a sequence of bytes starting at a given address.
• ✏️ Write bytes – Writes one or more bytes to the specified address.
• 🗃️ Dump EEPROM – Outputs the entire EEPROM contents in hex format.
• 💣 Erase EEPROM – Wipes all memory by setting all bits to 1.
• 🚪 Exit Shell – Leaves the shell and returns to the previous menu.

Supported Models

Model	Capacity (x8)	Capacity (x16)
93C46	128 bytes	64 bytes
93C56	256 bytes	128 bytes
93C66	512 bytes	256 bytes
93C76	1024 bytes	512 bytes
93C86	2048 bytes	1024 bytes

Note

• ORG pin selects organization mode:
  • ORG tied to GND → x8 (8-bit) mode
  • ORG tied to VCC → x16 (16-bit) mode
• EEPROMs with all bits set to 1 may be misdetected during probe.
• 93XX56A devices are always x8, 93XX56B devices are always x16.
• Pinout for 93CX6 series:

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📌 Example Usage

eeprom  # Open an interactive shell for EEPROM operations
config

🔧 Hardware