Casio QT-2100 - Block Diagram

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5-5-2. BLOCK DIAGRAM
I/O
CONTROLLER
12.5 MHz
PWD
RTS
CTS
DTR
TXD/RXD
3.3 V 5 V
RESET
from HardReset
from CPU PORT
LOAD × 2
CLOCK × 2
DATA × 2
BUZZ
MCR
BUZZER
MENU
SHEET
KC × 12
KI × 14
TXD (RS-232C)
INPUT
OUTPUT
BackLight ON/OFF
KEY
12
× 14
DRAWER
× 2
REAR
DISP
DALLAS
KEY
EPROM
4 Mbit
OPTION
iButton: 1Wired Line
BUS
LCD
VRAM
256 Kbit
LCDC
6 MHz
For Character Generator
Menu Sheet x 4
Drawer drive x 2
Drawer x 2
BUS outside WAIT
Back up power for 1/4 VGA VRAM only