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; ---------------------------------------------------------------
; A program to demonstrate MOV commands. Mov is short for move.
; ---------------------------------------------------------------
CLO ; Close unwanted windows.
; ===== IMMEDIATE MOVES =====
MOV AL,15 ; Copy 15 HEX into the AL register
MOV BL,40 ; Copy 40 HEX into the BL register
MOV CL,50 ; Copy 50 HEX into the CL register
MOV DL,60 ; Copy 60 HEX into the DL register
Foo:
INC AL ; Increment AL for no particular reason.
; ===== INDIRECT MOVES =====
MOV [A0],AL ; Copy value in AL to RAM location [40]
MOV BL,[40] ; Copy value in RAM location [A0] into BL
; ===== REGISTER INDIRECT MOVES =====
MOV [CL],AL ; Copy the value in AL to the RAM
; location that CL points to.
MOV BL,[CL] ; Copy the RAM location that CL points
; to into the BL register.
JMP Foo ; PRESS ESCAPE TO STOP THE PROGRAM
END
; ---------------------------------------------------------------
TASK
====
Look up the ASCII codes of the letters in H,E,L,L,O and move
these ASCII codes to RAM addresses [C0], [C1], [C2], [C3]
and [C4]. Run the program and watch how the text appears on
the simulated VDU display. This is very much the same as what
happens in the IBM PC running MS DOS. The program you write
should work but if you continue to study low level programming,
you will find much more efficient and flexible ways of solving
this problem.
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