Toshiba T2200SX User Manual page 22

MC146818AF Real Time Clock (RTC)
Keyboard Controller (KBC)
The KBC controls the internal keyboard, numeric ten keypad port, and mouse port.
The block diagram of the T2200SX system unit is shown in Figure 2-1.
CPU
80386SX
NDP
80387SX
RTC
Speaker
LCD
640x480
RGB
Port
2.5-inch HDD/HDC
2-6
SYSCNT-GA
MEMCNT
BUSCNT
BUSDRV
ADRDRV
Main Memory
Optional Memory
BIOS
ROM
Display
Controller
VRAM
256KB
Expansion
Connector
150-pin
Figure 2-1 System unit block diagram
SI9901
DMAC(80C37)x2
PIC(80C59)x2
TIM(80C54)x1
FDC(TC8565)x1
UART(TC8570)x1
VFO(TC8568)x1
IOCNTx1
3.5-inch FDD
RS-232-C
COMMS
DRV
Built-in Optional
Modem Card
Keyboard
KBC
Ten-key
Port
Mouse
Port
Option
Port