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 H8S/216x

Apparently H8S microcontrollers have been used on all ThinkPads since the A30, T23, R40, X20.

• T43, T43p, X41 Tablet: Renesas H8S/2161BV
• A31, T23: Renesas H8S/2169AV

• Renesas H8S/2116V

• T500: Renesas H8S/2116V

• 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

• Embedded controler firmware information and bugs
• BIOS and firmware upgrade information