Toshiba T4500 User Manual page 10

Clock Generator receives 14.31818 MHz (X1) and generates the following frequencies:
66.6 MHz for the CPU
14.7456 MHz for the COM
24 MHz for the FDC and VFO
16 MHz is used for GA
14.31818 MHz for WD90C26A (for VGA)
OSC (X3) generates 32.768 KHz for RTC (inside of the 82360SL).
A Power Supply Controller (PSC): TMP90PH48
Gate Array
Sub LCD Controller Gate Array
This gate array has the following functions:
Status Indicator Panel Controller
- LCD Segment Flashing Controller
Internal Communication Controller
- KBC/Power Supply Micro Processor/Main CPU Communication
Controller
- KBC/Power Supply Micro Processor Interrupt Controller
IC Card Controller Gate Array
This gate array has the following functions:
IC Card Controller
- Two cards support PCMCIA Card Controller
- Toshiba Modem Card Controller
EEPROM (for security) Controller
- KBC-Security-EEPROM Communication Controller
Others
- KBC Communication Controller
- Disable the HDD/FDD/SIO Access Controller
- Suspend/Resume Controller
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