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        ;; Generic crt0.s for a Z80
        .module bintr_crt0
        .globl  _main
        .globl  _isr
        .globl  _nmi_isr

        .area _HEADER (ABS)
        ;; Reset vector
        .org    0
        jp      init

        .org    0x08
        reti
        .org    0x10
        reti
        .org    0x18
        reti
        .org    0x20
        reti
        .org    0x28
        reti
        .org    0x30
        reti
        .org    0x38
        di
        push    af
        call _isr
        pop     af
        ei
        reti
        
        .org    0x66
        push    af
        call    _nmi_isr
        pop     af
        retn
        
        .org    0x100
init:
        ;; Stack at the top of memory.
        ld      sp,#0x7fff        

    ;; enable interrupts
        im      1
        ei
    
        ;; Initialise global variables
        call    _main
        jp      _exit

        ;; Ordering of segments for the linker.
        .area   _HOME
        .area   _CODE
        .area   _GSINIT
        .area   _GSFINAL
        
        .area   _DATA
        .area   _BSS
        .area   _HEAP

        .area   _CODE
__clock::
        ld      a,#2
        rst     0x08
        ret
        
_exit::
        ;; Exit - special code to the emulator
        ld      a,#0
        rst     0x08
1$:
        halt
        jr      1$

        .area   _GSINIT
gsinit::        

        .area   _GSFINAL
        ret