Toshiba T2100 Series Maintenance Manual page 9

Keyboard Controller (KBC)
One M38802 chip is used.
The KBC, which includes the keyboard scan controller and keyboard interface
controller, controls the internal keyboard, external keyboard port, and PS/2
mouse port.
Real Time Clock (RTC)
A T9934 chip with 128 bytes of memory is used. Fourteen bytes of memory
are used for the calendar and clock, and the remaining 114 bytes are used for
system configuration data.
IO-CNT GA
This gate array has the following functions:
System interface
Hot key control (KBC interface)
PS interface
BIOS ROM interface
NEXUS GA function
AccuPoint Controller (U43SC11X)
This controller emulates the AccuPoint signals to the PS/2 mouse on the port
replicator signal, and sends them to the KBC.
T2100 Series
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