;;;
;;; MCFS2 RAM variables
;;; By: Daniel Tufvesson 2017
;;;

;;;
;;; Program variables
;;;
		org	$bc00	; beginning of OS RAM
beg_of_vars:	equ	*	; beginning of variables
media_addr_3:	rmb	1	; sector address MSB
media_addr_2:	rmb	1	; sector address
media_addr_1:	rmb	1	; sector address
media_addr_0:	rmb	1	; sector address LSB
volume_beg:	rmb	2	; first sector of volume
volume_end:	rmb	2	; last sector of volume
alloc_beg:	rmb	2	; first sector of allocation table
alloc_end:	rmb	2	; last sector of allocation table
root_dir_beg:	rmb	2	; first sector of root directory
root_dir_end:	rmb	2	; last sector of root directory
wrk_dir_beg:	rmb	2	; first sector of work directory
wrk_dir_end:	rmb	2	; last sector of work directory
wrk_path:	rmb	128	; path to work directory
wrk_path_end:	equ	*-1	; end of work dir path
cur_dir_beg:	rmb	2	; first sector of current directory
cur_dir_end:	rmb	2	; last sector of current directory
cur_file_beg:	rmb	2	; first sector of current file
cur_file_end:	rmb	2	; last sector of current file
cur_file_saddr:	rmb	2	; first address of current file
cur_file_eaddr:	rmb	2	; last address of current file
line_buffer:	rmb	128	; console line buffer
line_end:	equ	*-1	; end of console line buffer
line_pointer:	rmb	2	; pointer whitin line_buffer
arg_pointer:	rmb	2	; pointer to command argument
ext_fcb:	rmb	2	; pointer or external file control block
temp:		rmb	1	; temporary storage
xtemp:		rmb	2	; temporary storage
xtemp2:		rmb	2	; temporary storage
end_of_vars:	equ	*-1	; end of variables
var_checksum:	rmb	1	; variable checksum

;;;
;;; Sector buffer
;;;
sector_buffer:
	rmb	512

;;;
;;; Volume header structure
;;;
		org	sector_buffer
vol_magic:	rmb	4	; file system ID = "MCFS"
vol_version:	rmb	1	; file system version = $02
vol_beg:	rmb	2	; first sector of partition
vol_end:	rmb	2	; last sector of partition
vol_id:		rmb	2	; volume ID
vol_name:	rmb	32	; volume label (zero terminated)
vol_alloc_beg:	rmb	2	; first sector of allocation table
vol_alloc_end:	rmb	2	; last sector of allocation table (up to 16 sectors)
vol_root_beg:	rmb	2	; first sector of root dir
vol_root_end:	rmb	2	; last sector of root dir

;;;
;;; RAM time stamp with checksum
;;;
	org	$bff8
ram_time:	
	rmb	7		; ISO 8601 time stamp
	rmb	1		; Time stamp checksum