Casio CE-6800, Service Manual

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2-2. BLOCK DIAGRAM (CE-6800)
Address
Latch
Address bus A8 - A19
A0 -A7
Data bus D0 -D7
CPU
uPD784215GC201-8EU
Data buffer
I/O selector
Printer driver
Printer
M-U420-031
COM1
COM3
Driver
Driver
Display driver and Key control circuit
Main display
(Dot & segment) Customer
display Keyboard
ARCNET
driver
IN-Line
MAIN PCB E457-1 C
RAM1
HY628100A
LLG-70
(128 K bytes) RAM3
(Option)
HM628512ALP-7
512 K bytes
(RAM-610)
Flash ROM 1
LH28F016SCT-L95
(2 M bytes)
RAM2
HY628100A
LLG-70
(128 K bytes)
Option I/O PB14
RAM4
(Option)
HM628512ALP-7
512 K bytes
(RAM-610)
COM2