; code.asm; C:>nasm code.asm -o code.xbe; This includeds the header information for the xbe file.%include "header.asm"; CODE ** CODE ** CODE ** CODE ** CODE ** CODE ** CODE ** CODE; CODE ** CODE ** CODE ** CODE ** CODE ** CODE ** CODE ** CODE; Lets jump to the entry point in our code; e.g. like we do with main() in C...jmp   startframebuffer:dd    0xf0010000 + 640*320 + 80;;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~DrawPixel:;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~; Setup Functionpush  ebp                           ; Setup our functionmov   ebp, esp; ecx = y;; ebx = x; ecx*=640; ecx = x+y*640mov   ecx, DWORD [ebp+12]                 ; put y pos in ecximul  ecx, 640    mov   ebx, DWORD [ebp+8]                  ; put x pos int edxadd   ecx, ebx                       ; hence ecx = x+y*640mov   ebx, DWORD [framebuffer]      ; Get the location in memory ; where we will put this pixel ; e.g. framebuffer; Put blue pixel into memorymov   eax, DWORD [ebp+16]                 ; put pixel colour in eaxand   eax, 255mov   BYTE [ebx+ecx*4], al; Put green pixel into memorymov   eax, DWORD [ebp+16]                 ; put pixel colour in edxand   eax, 65280shr   eax, 8mov   BYTE [ebx+ecx*4+1], al; Put red pixel into memorymov   eax, DWORD [ebp+16]and   eax, 16711680shr   eax, 16mov   BYTE [ebx+ecx*4+2], al; tidy up and return from function callpop   ebpret   0;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~; End of DrawPixel;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~; Globals;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xpos:dd    310                     ; width/2 = 640/2 = 310ypos:dd    240                     ; height/2 = 480/2 = 240      colour:dd    0xff0000              ; Red colour pixelxloop:                      ; We do a simple loop; and draw a small linedd    0x50;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~start:;~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~a_loop:; This is the same as DrawPixel(x, y, colour) push  DWORD [colour]push DWORD [ypos]push  DWORD [xpos]call  DrawPixeladd   esp, 12; Increment the ypos.mov   eax, [ypos]add   eax, 1mov   [ypos], eax; Loop around 100 times back to loopx - as; sometimes people say...I can't see; the red pixel...so using this simple asm ;loop... we've managed to draw a ; simple line : mov eax, [xloop] dec eax mov [xloop],eaxjne a_loop; Program has now finished, so we ;simply just stay here and loop bbb:   jmp bbb;; END OF CODE ** END OF CODE ** END OF CODE ** END OF CODE ; END OF CODE ** END OF CODE ** END OF CODE ** END OF CODE TIMES 0x6000-($-$$) DB 0x90   ; this will make our section finish at 0x6000 ; from the start of the file.TIMES 0x7000-($-$$) DB 0x0    ; And of course, this will make our file size ; equal to 0x7000 a nice round number - ; 0x7000 is 28672bytes... so if you assemble the file ; you should find its that size exactly.    

eject_cd:mov dx, 0xc004mov al, 0x20out dx, almov dx, 0xc008  ; commandmov al, 0x0Cout dx, almov dx, 0xc006  ; datamov al, 0x0out dx, almov dx, 0xc000in ax, dxout dx, almov dx, 0xc002mov al, 0x1aout dx, aldelay:mov eax, 1000000 ; Small delay looploopx:dec eaxjne loopxaa:jmp aa