> I did not catch how to do LPT interrupt, real and protected mode. It > would be a great help if there is an example. > I work with watcom and realized it, but only once, then the ISR is > never called again. > May be LPT is not very often used.
It would help to know exactly what you're trying to accomplish. In DOS you normally don't need to access the parallel port at the hardware (IRQ) level since the BIOS functions (INT 17h) normally work really well. If you're wanting to do something other than print (e.g., using any of the IEEE 1284 protocols including bi-directional, ECP, and EPP or downloading the printer identification data), then you might need to access the IRQ or at least manipulate the I/O port(s) directly. _______________________________________________ Freedos-user mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/freedos-user
