Can't move f000h to ax

I have been trying to compile this program using tasm

.model tiny
.data

.code
mov ax,f000h

end

And I get this error

E:\zzzz1\lab>tasm test3.asm
Turbo Assembler Version 3.1 Copyright (c) 1988, 1992 Borland International

Assembling file: test3.asm
**Error** test3.asm(5) Undefined symbol: F000H
Error messages: 1
Warning messages: None
Passes: 1
Remaining memory: 459k




And another question is how do I halt the processor
I tried "hlt", but when the code runs it pops up a dialog which says illegal instruction.

 

Did this thread get posted twice! Sorry about that