UBI EasyCoder 601 XP – Service Manual Ed. 1
18
Chapter 2 Front and Keyboard
2.4 Schematics
1-971604-01 Console pcb.
VCC
VCC
GND
PB0
PB1
PB2
PB3
PB4
PB5
PB6/ATIn
PB7/ATOut
PC0/Ain
PC1/Tin/Ain
PC2/Sin/Ain
PC3/Sout/Ain
PC4/SCK/Ain
Ain/PA0
Ain/PA1
Ain/PA2
Ain/PA3
Ain/PA4
Ain/PA5
Ain/PA6
Ain/PA7
NMI
RESET
OSCout
OSCin
TEST
GND
GND
GND
D0
D1
D2
D3
D4
D5
D6
D7
VCC
GND
VDISP
R/W
E
RS
A
B
C
A
VCC
C
A
VCC
GND
GND
GND
GND
PRE
D
CLK
CLR
Q
Q
VCC
PRE
D
CLK
CLR
Q
Q
GND
VCC
GND
VCC
C
A
GND
GND
GND
GND
GND
VCC
GND
VCC
GND
GND
VCC
VCC
VCC
GND
1
2
4
5
6
7
8
9
28
27
26
25
24
10
13
14
15
16
17
18
19
23
22
21
20
3
1
3
5
6
4
7
8
9
10
11
12
13
14
2
15
16
1
2
3
4
5
6
7
8
9
10
2
1
6
5
1
3
2
4
4
3
8
9
13
11
12
10
6
5
8
9
1
2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Beeper
ST6265
IC1
X1
8MHz
C3
C2
DISPLAY
DISPLAY
P1
RED
D3
GREEN
D2
R1
R2
C1
74HC05
IC3A
74HC74
IC2A
R9
74HC05
IC3B
74HC74
IC2B
74HC05
IC3C
R8
R4
74HC05
IC3D
B1
R5
R3
GREEN
D4
C12
C13
C14
C15
R10
D1
R21
R23
R25
R20
R22
R24
C10
C9
C7
C8
C5
C6
C4
R26
R17
R16
R15
R14
R13
R12
R18
R11
KEYBOARD
P2
R19
R7
R6
R27
R28
C16
C11
R29
INT
SCL
SDA
RESET