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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.