Radio Shack TRS-80 MICRO - Interface Input Signal; Interface Output Signal

Interface
Input
Signal
A.
Input Signal
System
Diagram
^\
DATA 1
DATA
2
DATA 3
DATA
4
PRINTER
DATA 5
DATA 6
DATA
7
DATA 8
STROBE
^
"
TRS-80
'
Ground
not
shown.
B.
Description
of Each
Input
Signal
(1)
DATA
LINES (DATA 1
~
DATA
8)
8
inputs, to
provide information for
actuating
the
printer
on
these
lines.
The
printer
will
ignore
any
invalid
code
applied.
(2)
STROBE
Is
a sampling signal
for
data lines,
providing
instruction
signals
for actuating
the
printer.
Output
Signal
A. Output Signal System
Diagram
BUSY
f
OUT
OF
PAPER
PRINTER
BUSY
TRS-80
ACK
FAULT
1
Ground not
shown.
B. Description
of
each
output
signal
(1)
BUSY
Busy
condition:
1)
Data
is
in
buffer
2)
Initial
state
3)
Off line mode
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