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Initially there are four channels - 'K', 'S', 'R', and 'P' - for communicating with the 'keyboard', 'screen', 'work space' and 'printer'. For each channel the output routine address comes before the input routine address and the channel's code.
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| CHANINFO | 05551 | DEFW PRINT_OUT | Keyboard. | |||||
| 05553 | DEFW KEY_INPUT | |||||||
| 05555 | DEFB "K" | |||||||
| 05556 | DEFW PRINT_OUT | Screen. | ||||||
| 05558 | DEFW REPORT_J | |||||||
| 05560 | DEFB "S" | |||||||
| 05561 | DEFW ADD_CHAR | Work space. | ||||||
| 05563 | DEFW REPORT_J | |||||||
| 05565 | DEFB "R" | |||||||
| 05566 | DEFW PRINT_OUT | Printer. | ||||||
| 05568 | DEFW REPORT_J | |||||||
| 05570 | DEFB "P" | |||||||
| 05571 | DEFB 128 | End marker. | ||||||
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