Uniwell SX-6600F, Repair Manual

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Explanation of Blocks - 3
3. Logic Block Circuit
3-1. Logic Block Diagram of MPU UNIT 071-1 (SX-6600)
As shown in the figure below, the logic block is composed of the following components:
- TMP95C265F CPU : the core which controls all machine circuitry and controls serial I/O
- 4M EP-ROM (512k x 8bit) : which contains the application program
- 4M CMOS RAM (512k x 8bit) : which memorizes the processed data
- D75206GF-740 Key/Display Controller : which controls Key, Display, Keyboard, Clerk Insert Key, Card Reader
- UPD71055 : which controls the Drawer sensor, Printer
MPU UNIT 071-1
DOT REAR
DISPLAY UNIT
Port
74HC273
Driver
Sensor
Drawer
I Button
Interface
I Button
2nd I/F
Board
EXT RAM
Board
ROM
512K x 8bit
RAM
512K x 8bit
CH-B
D-SUB
RS232C
Driver/Receiver
MC145406F
CH-A
D-SUB
RS485
Driver/Receiver
SN751178NS
16bit CPU
TMP95C265F
24.576MHz
XTAL1
32.768MHz
XTAL3
4.91MHz
XTAL2
Buzzer
Card
Reader
SX-7000
FLAT KEYBOARD
SX-7000 REAR
DISPLAY UNIT
Control
Key
Clerk
Insert Key
Driver
Sensor
DSP UNIT 061
Clocked Serial I/O
Digit line
Segment line
Scan line
Return line
Key / Display
Controller
D75206GF-740
A
d
d
r
e
s
s
/
D
a
t
a
L
i
n
e
Parallel Port
Interface
UPD71055
Printer
M-U420
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