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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. | ||||||||
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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. | ||||||||
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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 | |||||||||
| Prev: 092C | Up: Map | Next: 09A1 |