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

Page: 61 / 169

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