© Elcom Ltd.
Service manual
11
Euro-500T Handy
Pin #.
Signature
Type
Signal description
1
VRAMx
I
+5V power supply
2
FM-AL/CN0
O
validity of lower address byte for FM / keyboard control
3
FM-AH/CN1
O
validity of higher address byte for FM / keyboard control
4
A16/CN2
O
highest address bit for FM / keyboard control
5
FM-DIR/SCL
O
permission to read data from FM / clock signal for serial EPROM
6
SDA
I/O
data conductor for communication with serial EPROM
7
FM-SEL
O
choice of FM circuits
8
FM-PGM
O
control signal for FM programming
9
VPP-GEN
O
signal of program voltage control for FM
10
NC NC
11
GND
I
0 V power supply
12
TXD0
O
serial data output, channel 0
13
TXD1
O
serial data output, channel 1
14
RXD0
I
serial data input, channel 0
15
RXD1
I
serial data input, channel 1
16
EKB-DAT
I/O
data conductor for communication with external keyboard
17
EKB-CLK
O
clock signal for external keyboard
18
FD0
I/O
0.bit FM data
19
FD1
I/O
1.bit FM data
20
FD2/RW2
I/O
2.bit FM data / scanning keyboard
21
FD3/RW3
I/O
3.bit FM data / scanning keyboard
22
GND
I
0 V power supply
23
FD4/RW4
I/O
4.bit FM data / scanning keyboard
24
FD5/JP4
I/O
5.bit FM data / scanning JP4 jumper condition
25
FD6/JP5
I/O
6.bit FM data / scanning JP5 jumper condition
26
FD7/JP6
I/O
7.bit FM data / scanning JP6 jumper condition
27-34 D0-D7
I/O
data
bus
35
VRAMx
I
+5 V power supply
36-43 A0-A7
O
address
bus
44
GND
I
0 V power supply
45-55 A8-A18
O
address
bus
56
NC NC
57
GND
I
0 V power supply
58
LCD-SEL
O
activation signal of display controller
59
LCD-CLK
O
clock impulse generation for LCD controller
60
LCD-D/DPR
O
data for LCD conductor / data for printer
61
NC NC
62
STBY
I
input for hardware standby mode
63
RST
I
input for reset signal
64
NMI
I
unmasked interference input
65
GND
I
0 V power supply
66
EXTAL
I
input for external oscillator
67
XTAL
I
input for external oscillator
68
VRAMx
I
+5 V power supply
69
NC NC
70
RD
O
signal for reading data from activated circuit
71
HWR
O
signal for recording data to activated circuit
72
NC NC
73-75
MD0-MD2
I
choice of processor operating mode
76
AVCC
I
internal D/A and A/D inverter connection
77
VREF
I
reference voltage of internal D/A and A/D inverter
78
TSx
I
input for scanning printer head temperature
79
POWER
I
scanning presence and voltage value of primary supply
80
P-LOW
I
scanning voltage value of internal connecting accumulator
81
PS1x
I
scanning paper ribbon presence
82
PS2x
I
scanning paper ribbon presence
83
HSx
I
scanning printer head position
84
DRAWER
O
control signal for drawer opening
85
BUZZER
O
buzzer control
86
GND
I
0 V power supply
87
RDKEYB
O
signal for reading keyboard and JP4 - JP6 jumper condition
88
RW1
I
scanning keyboard
