25
2.2.5 Cassette Tape Deck Control Keys
The
four
green keys above
the
number
pad are called cassette
tape
deck control keys. See Figure
2.19.
[DDDDDDDDDDI
TAPE CONTROL
CURSOR
KEYS
ITJ
c:TI
CD
CTI
FIGURE 2.19 Location
of
Cassette Tape Deck Control
K~ys
These keys are connected directly
to
the
cassette tape deck and perform a different role
than
the
other
keys.t
The functions
of
these keys are as follows:
I
REW)
Rewinds
the
cassette tape.
QU
Fast forwards
the
cassette tape.
[sToP)
Stops
the
cassette tape.
[EJEcT)
Ejects
the
cassette.
These functions have
no
relation
to
the mode in which the
computer
is
operating.
Recording and reading data
to/from
the
cassette tape are controlled
by
the
software.
With
BASIC SB-551 0, recording
or
reading
of
program
text
is
performed
by
the
SAVE and LOAD
commands, respectively. Recording
or
reading
of
data files
is
performed
by
the
PRINT /T and INPUT/
T statements, respectively.
Instructions for recording and reading are provided with all system software.
t
All
other keys are scanned by the Z80A-PIO and processed by the software (See Paragraph 4.3 .3),
but
the cassette
tape deck control keys directly control the motor and eject mechanisms
of
the tape deck.
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