Epson TM U200D - B/W Dot-matrix Printer Technical Manual page 61

CPU pin functions
Pin CPU
No. Function
35 AD0
36 AD1
37 AD2
38 AD3
39 AD4
40 AD5
41 AD6
42 AD7
43 A8
44 A9
45 A10
46 A11
47 A12
48 A13
49 A14
50 A15
51 VSS
52 P20
53 P21
54 P22
55 P23
56 P90
57 P91
58 P92
59 P93
60 RD
61 WR
62 P32
63 P33
64 P40
65 P41
66 P42
67 P43
68 P44
69 P45
2-20 Mechanism Configuration and Operating Principles
Signal Name I/O Level
AD0
AD1
AD2
AD3
3 state TTL
AD4
AD5
AD6
AD7
A8
A9
A10
A11
O TTL
A12
A13
A14
A15
VSS I (0V)
CR A/DSW1
CR B/DSW2
I/O TTL
CR C/DSW3
CR D/DSW4
PF A/DSW5
PF B/DSW6
I/O TTL
PF C/DSW7
PF D/DSW8
RD O TTL
WR O TTL
DKD1 O TTL
DKD2 O TTL
HEAD8 O TTL
HEAD7 O TTL
HEAD6 O TTL
HEAD5 O TTL
HEAD4 O TTL
HEAD3 O TTL
Description
Address/data bus
Transmit address (lower 8 bits) and data.
Address bus (address upper 8 bits)
GND terminal
Motor, carriage drive control 2-2 phase
excitation All the terminals on (low): hold
DIP SW 1-1to 1-4 read when P100, P101 is low
Motor, paper feed drive control 2-2 phase
excitation All the terminals on (low): hold
DIP SW 1-5 to 1-8 read when P100, P101 is low
External memory data read signal
External memory data write signal
Drawer kick-out drive signal 1 Low: active
Drawer kick-out drive signal 2 Low: active
Print head #8 drive signal Low: on
Print head #7 drive signal Low: on
Print head #6 drive signal Low: on
Print head #5 drive signal Low: on
Print head #4 drive signal Low: on
Print head #3 drive signal Low: on
Rev.B