Hi, > No, FPC was being created as a protected-mode compiler from the very > beginning.
Is it very different to compile for protect-mode DOS and real-mode DOS? Interesting that FPC was based on TP 7, but TP 7 only compiled for real-mode. > Yes, you can, although especially interrupts might be somewhat more > complicated (depending on what you need to achieve). Let´s say write my own interrupt to communicate as fast as possible with a time sensitive hardware. I just wonder if a protected-mode could make this problematic.... Time sensitive hardware usually goes for real-mode solutions or very good drivers, or at least this is what I read. > For ports, you can use in/out instructions and the special array > port[] as supported by TP/BP (requires adding unit ports to uses > clause). I am already using them at this time =) ... just on TP 7 As the main part of the program is a Lazarus project it would be nice to have Free Pascal compiling it. > This will work if > interrupt handler for the protected mode version is installed - e.g. > protected mode version of interrupt 21h, i.e. DOS services, is > probably installed for most DPMI servers as far as I remember > correctly, but the same doesn't have to be true for other interrupts. > Calling the real mode version is possibly e.g. using GO32.RealIntr > (or SysRealIntr). Interesting. What is DPMI? > and you > have to remember that this memory block is addressed different way > while under real-mode (16-bit segment and offset must be passed to > real-mode code) and when accessing it from protected-mode (32-bit > flat address is used). Functions Global_Dos_Alloc and Global_Dos_Free > provided in unit Go32 are your friends here. thanks for the hints, -- Felipe Monteiro de Carvalho _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
