Code not working ... please review!

[Snowman]

So I tried everything, and it just won't compile.

I don't get errors, but nothing happens!

Here's the full source:

%INCLUDING "STACK.h"
extern call "TOPFLS"
extern call "nCaga"
%START : LAB1
%DRAW : LAB2
START:
MOVE BYTEPTR ALU, 0x000FF
MOVE ALU, WORDPTR
MOV BT, WORDPTR
COMPARE ALU, BT
%DRAW JUMP IF
DRAW:
MOVE ALU, BYTEPTR
MOVE DS, ES
MOVE AL, BL
MOVE SI, ASCII
CALL Int 0x10H
times PAD (_$32-512) EBX : Red
DEFINE WORDPTR, 0x000AF

PS: This is in Fgth - N815sa Assembly for the N815sa Airline chip.