What's this?
This simple device allows you to connect I2C-enabled chips (serial memories, RTCs, port expanders) to your computer using printer port (LPT, parport).Okay, but what can I use it for?
Mostly servicing stuff, like:
- reading/writing serial eeproms (like 24C04 or SPD)
- getting lots of GPIO, via expanders like PCF8574
Documentation
- schematics [png, 18k], photo [jpg, 80k]
All pull-ups are 10-20k. The photo shows the adapter with a 24C04 EEPROM inserted (used to store HDD encryption password).
Drivers
All the needed drivers are included in 2.6 kernels. They are loaded using modprobe i2c-parport type=0. Pinout of the adapter is Philips adapter
, and is also compatible with MCS Flashprogrammer. Devices can be accessed using standard /dev/i2c-* nodes or with additional drivers (modprobe pcf8574, modprobe eeprom).
