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====== Intro ======


CC65 is a cross compiler for 6502 based computers.

It works also with the oric.

====== How to install ======

Linux : install cc65 package and cc65-atmos package







====== Build C function with ca65 ======

  .export _print_char
  .import popa ; import internal popa primitive
  ; print_char(char car) when function called, cc65 calls a pusha (8 bits) primitive, which push parameter  car on stack, last parameter push is the first pulled
  _print_char:
    jsr popa ; Fetch car value
    sta $bb80 ; put it on the screen
    rts

====== zero page primitive ======

These primitives are defined in libsrc/runtine/zeropage.s of cc65

  sp:	      	.res   	2      	; Stack pointer
  sreg:	      	.res	2      	; Secondary register/high 16 bit for longs
  regsave:      	.res	4      	; slot to save/restore (E)AX into
  ptr1:	      	.res	2
  ptr2:	      	.res	2
  ptr3:	      	.res	2
  ptr4:	      	.res	2
  tmp1:	      	.res	1
  tmp2:	      	.res	1
  tmp3:	      	.res	1
  tmp4:	      	.res	1
  regbank:      	.res	6      	; 6 byte register bank

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