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4)
Error
state
5)
Ribbon
fault state
6)
Cover open
state
Ready
condition:
1)
States
other than
above
1)
to 6)
2)
Cover
close
state
(2)
OUT
OF PAPER
No
function.
This
line
is
always
"0"
signal.
(3)
BUSY
This
signal
is
the
logical
invers
of
BUSY.
(4)ACK
This
signal
is
indicates Printer
is
no
longer busy.
(5)
FAULT
This
signal indicates Printer
is
in
error
state, in
ribbon
fault state, in
cover
open
state
or
in
off
line state.
Interface
Signal
Pin Assignments
Pin 18
pin
1
pin
36
z)
pin 19
Pin
Signal
Name
Pin
Signal
Name
1
19
GND
STROBE
2
DATA
1
20
GND
3
DATA
2
21
GND
4
DATA
3
22
GND
5
DATA
4
23
GND
6
DATA
5
24
GND
7
DATA
6
25
GND
8
DATA
7
26
GND
9
DATA
8
27
GND
10
ACK
28
GND
11
BUSY
29
GND
12
OUT
OF PAPER
30
GND
13
14
BUSY
GND
31
32
N.C
FAULT
15
GND
33
GND
16
GND
34
N.C
17
GND
35
N.C
18
+
5
VDC
36
N.C
Note:
• N.C.
pins are
actually
pulled
up
to
+
5
VDC
through
a
4.7K
resistor.
• Pin
18 provides
+
5
VDC
to
the
TRS-80
(less
than 80
mA
of
current).
-
24
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