Embedded Controller Chips

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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.
  • 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.

See also