How's this:
Interrupt Enable Bit
The parallel port interrupt was intended to allow interrupt-driven
transmission of data to a printer, but is not used by DOS and BIOS.
Versions of OS/2 prior to Warp (3.0) required the interrupt for
printing, but from Warp onwards the interrupt is not required (though
it can be used if the /IRQ switch is provided on the line in
CONFIG.SYS, e.g. BASEDEV=PRINT0x.SYS /IRQ).
The interrupt control bit controls a tri-state buffer that drives the
IRQ (interrupt request) line. Setting the bit to 1 enables the
buffer, and an IRQ will be triggered on each rising edge (low to high
transition) of the -ACK signal on pin 10 of the 25-pin connector.
Disabling the buffer allows other devices to use the IRQ line.
Important note: some older parallel ports trigger the interrupt on
the falling edge of -ACK.
--- In Electronics_101@y..., adityanewalkar@y... wrote:
Hi,
In EPP mode if the peripheral wants to communicate something
to the
PC, is there a way to interrupt the PC??
Though there is an interrupt bit defined in the standards,
Control
Port bit number 4 called Enable Interrupt Request; I am not finding
any resources on the perticular thing. Can somebody tell me sources
describing SPECIFICALLY ABOUT PARLLEL PORT INTERRUPT??
Please don't give me some sites giving BASIC information. I
want
specifically PARALLEL PORT INTERRUPT.
Thanx in advance.
Aditya N.
