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IBM 5150 Technical Reference

IBM 5150
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Cassette Interface
The
cassette interface
is
controlled through software.
An
output
from
the
8253 timer controls the
data
to the cassette recorder
through pin 5
of
the cassette
DIN
connector
at
the
rear
of
the
system board.
The
cassette input
data
is read
by
an
input
port
bit
of
the
8255A-5
PPI. This
data
is
received through pin 4
of
the
cassette connector. Software algorithms are used to generate
and
read cassette data.
The
cassette drive
motor
is
controlled through
pins 1
and
3
of
the cassette connector.
The
drive
motor
on/off
switching is controlled
by
an
8255A-5
PPI
output-port
bit (hex
61,
bit
3).
The
8255A-5
address
and
bit assignments are defined
in
"I/O
Address
Map"
earlier in this section.
A 2
by
2 Berg pin
and
a jumper are used
on
the cassette
'data
out'
line.
The
jumper allows use
of
the
'data
out'
line as a O.075-Vdc
microphone input
when
placed across the M
and
C
of
the Berg
Pins. A O.68-Vdc auxiliary input
to
the cassette recorder is
available when the jumper
is
placed across the A
and
C
of
the
Berg Pins.
The
"System
Board
Component
Diagram" shows the
location
of
the cassette Berg pins.
M
A
M
A
c
c c
c
Microphone
Input
Auxiliary
Input
(0.075
Vdc)
(0.68
Vdc)
System Board
1-27

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IBM 5150 Specifications

General IconGeneral
BrandIBM
Model5150
CategoryDesktop
LanguageEnglish

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