Sharp MZ-80B Owner's Manual page 23

14
To read system software from a cassette tape with the floppy disk unit connected to the MZ-80B
(or with the floppy disk interface card inserted in the 1/0 port of the MZ-80B), switch on the MZ-80B
while pressing the
0
(cassette tape) key. (Loading control proceeds along flowline~.) Energizing
the MZ-80B without pressing the
0
key drives the master diskette if it is contained in drive No. 1.
When drive No. 1 is inoperative, however, when branch point
{3
is reached the MZ-80B asks whether
loading is to be made from cassette tape or a diskette. If the
0
key is then pressed, the cassette tape
will undergo initial program loading.
If
you intend to perform initial program loading from any drive other than drive No. 1, make drive
No. 1 inoperative before turning the power on. The drive can be made inoperative by not inserting a
diskette, by leaving its cover open or by switching it off.
Program loading will then proceed to branch point
{3,
at which time the system asks whether
cassette tape or diskette is specified. Press the
0
(floppy diskette) key. The system further asks
which drive number is desired. Input the desired number by pressing the corresponding key.
When you must rewind the cassette tape before initial program loading, first initiate cassette-based
loading, then press the
[BREAK
J
key. This will cause loading control to move to branch point
{3,
causing
the tape to be rewound. When the tape is completely rewound, press the
0
key.
Pressing the
0
key before the tape is completely rewound causes the system to begin the file
search immediately.
When you must fast forward the tape, first initiate cassette-based loading, then press the
[BREAK)
key. This will cause the tape to be rewound as described above. Press the
[sroPI
key of the cassette
recorder to stop tape travel and press the QO key to fast forward. Interrupt tape travel again by
pressing the
[sroPI
key, then press the
0
key to start the file search.
Initial program loading does not provide for discrimination between program texts according to
file name. When loading from cassette tape the system reads the first OBJECT mode file it encounters.
If the system encounters any file other than one in the OBJECT mode, it displays the error message
"FILE MODE MISMATCH ERROR".
The memory map and other references for initial program loading are given in item 3 of the Ap-
pendix . The assembly listing for the initial program loader is shown in the SUPPLEMENT.
The MZ-80B system can, of course, read (through IPL) any system software you have worked
out on the MONITOR SB-151 0 or other systems. The MONITOR SB-151 0 Reference Manual des-
cribes procedures for creating system software with the aid of MONITOR.