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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