;********************************************************************************
; @module system
; @type header
; @details
;   Variable definitions for the current hardware setup
;********************************************************************************

.ifndef INCLUDE_SYSTEM
INCLUDE_SYSTEM = 1
; reserved RAM addresses
; 00-0f - free use  (Z0-Z15)
; 10-1f - arguments / return values (ARG0-ARG15)
; 20-ff - free
; 0100 - 01FF Stack
; 0200,0201 keybuffer write/read pointer
; 0202-02ff keybuffer
; 0300 lcd character counter


.include "io_W65C22.h65"
.include "utility.h65"
.importzp Z0,Z1,Z2,Z3,Z4,Z5,Z6,Z7,Z8,Z9,Z10,Z11,Z12,Z13,Z14,Z15
.importzp ARG0,ARG1,ARG2,ARG3,ARG4,ARG5,ARG6,ARG7,ARG8,ARG9,ARG10,ARG11,ARG12,ARG13,ARG14,ARG15

; Z0    = $0
; Z1    = $1
; Z2    = $2
; Z3    = $3
; Z4    = $4
; Z5    = $5
; Z6    = $6
; Z7    = $7
; Z8    = $8
; Z9    = $9
; Z10   = $a
; Z11   = $b
; Z12   = $c
; Z13   = $d
; Z14   = $e
; Z15   = $f
; ; ARGUMENTS
; ; a,x,y can also be used 
; ARG0    = $10
; ARG1    = $11
; ARG2    = $12
; ARG3    = $13
; ARG4    = $14
; ARG5    = $15
; ARG6    = $16
; ARG7    = $17
; ARG8    = $18
; ARG9    = $19
; ARG10   = $1a
; ARG11   = $1b
; ARG12   = $1c
; ARG13   = $1d
; ARG14   = $1e
; ARG15   = $1f


; RETURN VALUE 
.segment "VIA1"
; IO1:    .res 16
IO1     = $6000

.segment "VIA2"
; IO2:    .res 16
IO2     = $7000

.endif ; include guard