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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 | 15AF | DEFW PRINT_OUT | Keyboard. | |||||
15B1 | DEFW KEY_INPUT | |||||||
15B3 | DEFB "K" | |||||||
15B4 | DEFW PRINT_OUT | Screen. | ||||||
15B6 | DEFW REPORT_J | |||||||
15B8 | DEFB "S" | |||||||
15B9 | DEFW ADD_CHAR | Work space. | ||||||
15BB | DEFW REPORT_J | |||||||
15BD | DEFB "R" | |||||||
15BE | DEFW PRINT_OUT | Printer. | ||||||
15C0 | DEFW REPORT_J | |||||||
15C2 | DEFB "P" | |||||||
15C3 | DEFB $80 | End marker. |
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