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Ещё раз о прямом доступе к аппаратуре Сивцов Павел Преамбула Однажды мой знакомый попросил написать ему простую программу — «сторожевой пёс». Всё, что нужно делать — это отловить момент размыкания или замыкания внешнего контакта и при наступлении такого события запустить другую программу. Работать программа должна под Wi dows XP. Задача выглядела элементарной. Единственное, что не хотелось делать — аппаратную часть. Т.е. лучше всего было бы найти такое решение, при котором почти ничего не нужно было бы паять. Достаточно быстро выяснилось, что проще всего для такой цели использовать опрос состояний LP - или COM-портов. Тут и начинается самое интересное. LP Для реализации «сторожевого пса» на LP -порту можно использовать периодический опрос состояния некоторых его контактов. Можно просто выявлять состояния линий SELEC ED (контакт 13), BUSY (контакт 11) и PAPER EMP Y (контакт 12). Достаточно замыкать/размыкать выбранный контакт с «землей» (контакты 18–25). Я выбрал использование BUSY — замыкал контакты 11 и 23. Итак, аппаратная часть получалась элементарной, теперь нужно было как-то достучаться до выбранного контакта с программной стороны. | |
 Фломастеры утолщенные "Jumbo", 24 цвета. Фломастеры, вентилируемый колпачок, утолщенный трехгранный корпус. В наборе: 24 цвета. 515 руб Раздел: 13-24 цвета  Музыкальная шкатулка в форме трапеции. Внутри шкатулки находится фигурка. При заводе шкатулки, фигурка кружится и звучит приятная мелодия. Размер: 13х16х9 см. Шкатулка 697 руб Раздел: Шкатулки музыкальные  Руль музыкальный "Вперёд!". Чтобы игрушка превратилась в мини-синтезатор достаточно включить поворотники. Кроме того, руль обучит ребенка видам транспорта. На кнопках 665 руб Раздел: Рули |  New International Business English: Workbook: Cassette Set: 2 аудиокассетыАлександр Р.,Джонс Л. Cambridge University Press 859 руб |  Dictionary of international business terms 3rdCapela Barron's Ed 782 руб |
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