Hi,
With the idea of creating a TSR (and not a DOS device driver), I would
suggest reading other simple TSR's, in order to see how to hook/unhook
interrupt vectors. The basics would be to hook and then finish your program
with the terminate_and_stay_resident call.
mKEYB or FD-KEYB are examples (in C and Pascal programming languages,
respectively).
Regards,
Aitor
2015-01-02 18:03 GMT+01:00 Andy Stamp <[email protected]>:
> Hello Folks,
>
> I've been working on creating a program called LPXLATE which converts
> ESC/P print data from legacy apps into PCL or PS for printing on modern
> printers.
>
> Most of my time has been spent working on the conversion routines, but I
> would like to start working on integrating this code into a TSR that could
> be installed and would hijack calls to output bytes to the parallel port
> and feed them into this app which in turn would output the translated data
> via the parallel port.
>
> I am wondering what resources I should look into for info on hijacking
> BIOS calls (INT 17h) and creating TSRs.
>
> I downloaded a copy of Ralf Brown's interrupt list and found Peter
> Norton's guide to programming the IBM PC at a thrift store.
>
> A quick Googling suggests Undocumented DOS and the IBM PC XT hardware
> reference.
> Is there any proprietary info in these that would taint my contributions
> to FreeDOS?
>
> Obviously reading leak MS/DR-DOS source code is bad, but I want to make
> sure.
>
> Thanks,
>
> --
> --Andy
>
>
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