#include <machine.h>
#include "saga_spr.h"
#include "sega_scl.h"
#include "sega_int.h"

extern void vbStart (void); / * V-BLANK IN interrupt routine * /
extern void vbEnd (void); / * V-BLANK OUT interrupt routine * / 

main()
{
     Uint8 * vram; / * VRAM address storage area * / 

     set_imask (0); / * Enable interrupts * / 

     SCL_Vdp2Init (); / * Scroll and priority initialization * /
     SCL_SetPriority(SCL_SP0|SCL_SP1|SCL_SP2|SCL_SP3|SCL_SP4|
                     SCL_SP5|SCL_SP6|SCL_SP7,7);
     SCL_SetSpriteMode(SCL_TYPE1,SCL_MIX,SCL_SP_WINDOW);
     SPR_Initial (& vram); / * Initialize sprite * / 

     INT_ChgMsk(INT_MSK_NULL, INT_MSK_VBL_IN | INT_MSK_VBL_OUT);
                                    / * Disable V-BLANK interrupt * /
     INT_SetFunc(INT_SCU_VBLK_IN, &vbStart);     
                                    / * Register V-BLANK IN interrupt routine * /
     INT_SetFunc(INT_SCU_VBLK_OUT, &vbEnd);     
                                    / * Register V-BLANK OUT interrupt routine * /
     INT_ChgMsk(INT_MSK_VBL_IN | INT_MSK_VBL_OUT, INT_MSK_NULL);
                                    / * Enable V-BLANK interrupt * / 

     SCL_SetFrameInterval (2); / * Frame change interval * /
                                    / * Set to 2/60 seconds * / 

     for(;;){
           memcpy(vram,command,sizeof(command));
                                    / * Set sprite command in VRAM * / 

              -------- / * Scroll data set * /
           SCL_DisplayFrame (); / * Wait for V-BLANK interrupt * /
                                    / * Display sprite and scroll * /
     }
 }

−V blank processing routine (source file different from the above main) − 

#include   
#include "sega_spr.h"
#include "sega_scl.h"

#pragma  interrupt(VbStart)
#pragma  interrupt(VbEnd)

void VbStart(void)
{
     SCL_VblankStart (); / * V blank start VDP interrupt handling * /