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Routines |
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Used by the routine at SAVE_ETC.
The operation of saving a program or a block of data is very straightforward.
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SA_CONTRL | 0970 | PUSH HL | Save the 'pointer'. | |||||||||
0971 | LD A,$FD | Ensure that channel 'K' is open. | ||||||||||
0973 | CALL CHAN_OPEN | |||||||||||
0976 | XOR A | Signal 'first message'. | ||||||||||
0977 | LD DE,$09A1 | Print the message 'Start tape, then press any key.' (see CASSETTE). | ||||||||||
097A | CALL PO_MSG | |||||||||||
097D | SET 5,(IY+$02) | Signal 'screen will require to be cleared' (set bit 5 of TV-FLAG). | ||||||||||
0981 | CALL WAIT_KEY | Wait for a key to be pressed. | ||||||||||
Upon receipt of a keystroke the 'header' is saved.
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0984 | PUSH IX | Save the base address of the 'header' on the machine stack. | ||||||||||
0986 | LD DE,$0011 | Seventeen bytes are to be saved. | ||||||||||
0989 | XOR A | Signal 'it is a header'. | ||||||||||
098A | CALL SA_BYTES | Send the 'header', with a leading 'type' byte and a trailing 'parity' byte. | ||||||||||
There follows a short delay before the program/data block is saved.
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098D | POP IX | Retrieve the pointer to the 'header'. | ||||||||||
098F | LD B,$32 | The delay is for fifty interrupts, i.e. one second. | ||||||||||
SA_1_SEC | 0991 | HALT | ||||||||||
0992 | DJNZ SA_1_SEC | |||||||||||
0994 | LD E,(IX+$0B) | Fetch the length of the data block that is to be saved. | ||||||||||
0997 | LD D,(IX+$0C) | |||||||||||
099A | LD A,$FF | Signal 'data block'. | ||||||||||
099C | POP IX | Fetch the 'start of block pointer' and save the block. | ||||||||||
099E | JP SA_BYTES |
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