Casio TK-6500 Service Manual page 8

4-2. BLOCK DIAGRAM (TK-6500)
COM2
COM1
IN-Line
Option I/O PB14
Address bus A8 - A19
Address
Latch
A0 -A7
RAM1
HY628100A
LLG-70
(128 K bytes)
RAM2
HY628100A
LLG-70
(128 K bytes)
Printer
Driver
M-U420-061
Driver
ARCNET
Printer driver
driver
CPU
uPD784215GC-084-8EU
Data bus D0 -D7
RAM3
(Option)
HM628512ALP-7
512 K bytes
(RAM-610)
MAIN PCB E457-1 C
— 6 —
Main display
Customer
(Dot & segment)
display
Display driver and Key control circuit
I/O selector
Flash ROM 1
LH28F016SCT-L95
(2 M bytes)
Flash pack (Option)
Memory cassette RAC-9
Keyboard
Data buffer