#ifndef  __INTERRUPT_H__
#define  __INTERRUPT_H__

#define  DI               __asm di __endasm
#define  EI               __asm ei __endasm
#define  READ_VDP_STATUS  __asm in a,(#0x99) __endasm

#define SAFE_ALL_REGISTER\
__asm\
    push af\
    push bc\
    push de\
    push hl\
    push ix\
    push iy\
__endasm


#define RESTORE_ALL_REGISTER\
 __asm\
       pop iy\
       pop ix\
       pop hl\
       pop de\
       pop bc\
       pop af\
   __endasm


/*
	To write your own ISR:

	void my_isr(void) interrupt {
            DI;
            SAFE_ALL_REGISTER;
            READ_VDP_STATUS;
            ...
            your code goes here
            ...
            RESTORE_ALL_REGISTER;
            EI;		
 	}


	To install:   install_isr(my_isr);
	To uninstall: uninstall_isr();
*/

extern unsigned int old_isr;

extern void install_isr(void (*isr)(void));
extern void uninstall_isr(void);

#endif