Toshiba 50CT User Guide - Page 19
System Unit Block Diagram, Hardware Overview, One RTC:T9934 equivalent
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1.2 System Unit Block Diagram 1 Hardware Overview q System Controller Gate Array This gate array has the following functions: • Two PICs: 82C59 equivalent • Two UARTs:16550A equivalent (one SIO is used for SIR) • One PIT:82C54 equivalent • One RTC:T9934 equivalent • Two DMACs:82C37 equivalent • I/O port decode • SIO port control • Parallel (ECP) port control • Speaker control • Power supply microprocessor interface • PnP support • CPU control − SMI control − Clock speed control • Memory control − 64-bit memory bus control • Video local bus control − 64 to 32-bit, 32 to 64-bit data bus interface • Address latch control − Address conversion − Address latch • Hibernation control • Ring wake up control • PC card control − Memory card control − I/O card control • BIOS-ROM interface • Infrared port control • Sound control q Keyboard Controller (KBC) This KBC includes: the keyboard scan controller and keyboard interface controller; and controls: the internal keyboard, external keyboard, IPS and PS/2 mouse. 1-6 Libretto 50CT/70CT Maintenance Manual