Embedded Controller Chips
The ThinkPad Embedded Controller
This page contains information about Embedded Controller (also known as slave controller) chips found in ThinkPads.
- Renesas H8
- T20: H8/3437 ; 64F3437TF16 JAPAN (sticker label 08K3766 REV 11)
- Renesas H8S
- Apparently H8S microcontrollers have been used on all ThinkPads since the A30, T23, R40, X20.
- Microchip MEC1633
- The Microchip MEC1633-series Embedded Controllers can be found in newer ThinkPads, including the following:
- Unknown chips with field-upgradeable firmware
- Used on older ThinkPads, including the model 570, and maybe even earlier models. IBM called them Slave Controllers.
- Unknown chips with non-field-upgradeable firmware
- Used on ancient ThinkPads.