Radio Shack TRS-80 26-3650

II.
CASSETTE INTERFACE (26-3651)
SPECIFICATIONS
Output
terminal:
Input terminal:
Remote control terminal:
Data recording format:
Power source:
Power
consumption:
Battery life
(for
continuous
operation):
Dimensions:
White mini-plug,
output impedance: approx. 40 kohms,
output
level:
3
~
50mV
Black mini-plug, input
impedance: approx. 20 kohms,
input level:
2.5
~
50V.
Gray
sub
mini-plug,
24V,
1
A
or less.
Kansas
City standards (300BPS).
(For remote control)
Two AA size dry batteries.
0.3W.
Approx. 7
hours.
173mmW X
114mmD X 31.5mmH.
2. BLOCK DIAGRAM
D4
6
VODS^
Q.
£
CE2
s
CO
c
Q
E
o
OP
GND
=0
=c>
LSI
HD43110
77
CRYSTAL
OSCILLATOR
FILTER
CIRCUIT
SHAPING
CIRCUIT
REMOTE
CONTROL
CIRCUIT
D
MIC
EAR
REMOTE
£>
3
CO
H
a>
30
CD
8
Q.
CD
LSI
:
Kansas
City
standards
applied
cassette tape
interface
LSI.
Transfers
serial
data
by the
following
frequencies.
Data"1"
2,340
Hz
Data"0"
1,170
Hz
Filter
Circuit:
Converts
LSI's
data pulse
into AC
waveform
for
tape
recorder.
Shaping
Circuit:
Converts
AC
waveform
data from
tape
recorder
into
square pulse for
the LSI.
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16-