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Interfacing the Standard Parallel Port http://www.senet.com.au/~cpeacock
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The Parallel Port interrupt can be disabled and enabled using bit 4 of the
control register, Enable IRQ Via Ack Line. Once enabled, an interrupt will occur upon a low to high
transition (rising edge) of the nACK. However like always, some cards may trigger the interrupt on
the high to low transition.
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PIO_WriteControl( hPIO, 0xD4); (виндрайвером, грубо)
или так
outportb(CONTROL, inportb(CONTROL) | 0x10); /* Enable Parallel Port IRQ's */
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