The Memory Plug is a small board which will accommodate up to 4 STMicroelectronics M24M01 EEPROM memory chips. Total potential storage with four chips is 512 K bytes of memory. The 128K version of the board has one chip, the 256K variant two.  An I2C bus running at 3.3V is used as interconnect, with all the power and signal lines brought out to to both sides of the board to allow daisy-chaining with other I2C-conformant boards.

The pre-assembled version comes with one SMDzed M24M01 flash memory chip (i.e. 128 Kbyte) populated and the decoupling capacitor already soldered onto the board. The PCB is available for those wishing to populate their own boards, and can accommodate from 1 to 4 chips (128, 256, 384 or 512 Kbytes).

The preassembled version ships with one six-pin right angle male header.
The PCB only variant contains just the board for the Memory Plug. No parts, no headers.

Package Contents
Assembled Memory Plug board
1 6 pin male right angle header

OR

Memory Plug PCB

Resources
m24m01 EEPROM datasheet
JeeLabs Memory Plug page