Sharp ER-A450T - Keyboard Operations; Standard Keyboard Layout

CHAPTER 4. HARDWARE DESCRIPTION
1. Hard ware block diagram
Fig. 1-1
CPU
GATE ARRAY
MPCA7
DRAWER
STANDARD
RAM1
256KB
OPTIONAL
RAM2
512KB
ER-03RA:512KB
STANDARD
ROM
512KB
SWITCH
KEY BOARD
RS232
I/F
1 ports
RS232
I/F
CH1
CKDC8
OPC2
1 LINE
7SEG 7DIG
1 LINE
7SEG 10DIG
CUSTOMER DISPLAY
OPERATER DISPLAY
TPRC1
PRINTER
PR-45M
4 – 1