I dont see a superficial problem calling int21 to change int21 vector,
because when it reaches its internal functions to actually write the
vector, the jump is done a long time ago.... well, that=B4s my
opnion...
Anyway, i tried to change the code to use direct write of the vector:
int seg, off;
seg =3D FP_SEG(int21);
off =3D FP_OFF(int21);
asm{
push ax;
push es;
mov ax, 0;
mov es, ax;
mov ax, off;
mov word ptr es:0x86, ax;
mov ax, seg;
mov word ptr es:0x84, ax;
pop es;
pop ax;
}
Also, I=B4ve tested indos and critical error flag before change the
vector, tried to remove the "interrupt" directive from int21
declaration, and changed to _chain_intr(old21). All of them gives me
the same error... looks like when the program is exiting,
command.com freezes, it never gets to the prompt again.
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