.include _hwdefs.asm
.include _clrdefs.asm

;; Defines
.define VARS $0100

;; Variables
.org SYSRAM
stack: byte[128]

.org VARS
hello_str: "Hello world!\0"

;; Main
.org SYSROM
lds stack

jss cls

ldp screen.char
ldq hello_str
jss print

hlt

;; Clear the screen
FUNC cls:
  ldp screen.char
  ldc $00 ;; Blank
  ldq screen.color
  ldb CLR_BLACK ;; Black
  .cls_loop: {
    stc *p++
    stb *q++
    lda pl
    cmp (lo(COLOR))
    jnz .cls_loop
    lda ph
    cmp (hi(COLOR))
  jnz }
rts

;; Print string (Q) to the current screen cursor (P)
FUNC print:
  lda *q++
  jpz .print_end
  sta *p++
  jmp print
  .print_end:
rts