> 1. The very basic problem is with the video driver. Whenever I try to write > to the Video memory either there is no reponse, or I receive a run time > error 216. I tried all possibilities of using an absolute array, pointers, > and even FillWord, nothing works out. > > 2. Since my Operating System will be Object Oriented, the compilation > consists of calling a FPC_HELP_CONTRUCTOR which in turn calls the built in > AsmGetMem function. But during the system initialization process there will > be no memory manager. Is there a possiblity of constructing an object at a > predetermined location like in C++?
1) use TP objects instead of classes 2) (better) provide an own startup temporary memmanager. > Var x, y: Byte > > Procedure ClrScr; Assembler; [Public, Alias: 'CLRSCR']; > ASM > mov edi, $B8000 > mov eax, $07200720 > mov ecx, 2000 > rep > stosw > mov x, 0 > mov y, 24 > End; > This piece of code always gives a RTE 216. You write a lot of bytes to %ds:[$B8000]. Since you are writing an OS, the selectors could be setup in a multitude of ways. Are you sure you mapped the videocard memory to that location? I suggest to check your early OS bootup code how you enter protected mode and set up the selectors. E.g. under dos the videocard memory is in $B8000 in the real mode segment (which is %fs:$B8000 under Go32v2 typically), but if you didn't setup the selector in your bootloader, it is pretty much random. _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
