update gauss calculation example

mbr/gauss_calculation.asm

@@ -0,0 +1,45 @@
+
+;;=============================================================================
+;; Gauss Calculation
+;; 1 + 2 + 3 + ... + 100 = ?
+;; We dont use gauss fomula (i.e. paring numbers)
+;; Just use computer to calculate the addition which must be faster than Gauss.
+;;=============================================================================
+
+org 7c00h
+
+%include "inc/io.inc"
+
+init:
+    jmp Start
+    DECLARE_IO_API
+
+section .text
+Start:
+	cls
+	mov ax, 1 ;; operand
+	mov dx, 0 ;; sum
+	mov cx, 100
+
+ADD:
+	add dx, ax
+	inc ax
+	loop ADD
+
+PrintResult:
+	mov si, msg
+	call puts
+
+	mov ax, dx
+	call Disp2ByteInHex
+
+End:
+	jmp $
+;;=============================================================================
+
+msg db '1+2+3+4+...+100=0x', 0
+;;=============================================================================
+
+times (512-($-$$) - 2)	db 0 
+db   0x55, 0xAA          ;2 byte boot signature
+;;=============================================================================

mbr/nmake.bat

@@ -6,6 +6,9 @@ if not exist bin (
     mkdir bin
 )
 
+:: Build
+nasm -f bin -o bin\%1.bin -l bin\%1.lst %1.asm
+
 if not exist bin\bochsrc.bxrc (
     xcopy /Y ..\template\bochsrc.bxrc bin\
     xcopy /E /Y ..\template\bxshare bin\bxshare\
@@ -20,9 +23,6 @@ if not exist system.img (
 :: Remove temp files which may prevent starting a new bochs instance
 del /s /q system.img.lock
 
-:: Build
-nasm -f bin -o %1.bin -l %1.lst ..\%1.asm
-
 dd if=%1.bin of=system.img bs=512 count=1
 
 :: Run