XBINDX (16 bit number to decimal)
Description
convert A & Y number into decimal string
Input
A & Y the 16 bits value
TR5 the pointer of the address to put decimal number (String)
DEFAFF : space before the number
Example 1 : Displays value AY (16 bits number) in $bb80 text mode
    .include "telestrat.inc"
    lda        #<$bb80
    sta        TR5
    lda        #>$bb80
    sta        TR5+1
    lda        #$20
    sta        DEFAFF
    ldx        #$01
    ldy        #$00
    lda        #$10
    BRK_KERNEL XBINDX
    rts
See itoa macro from orix-sdk to use it