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fmt_turrican2.s
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fmt_turrican2.s
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;*---------------------------------------------------------------------------
; :Program. fmt_turrican2.s
; :Contents. decode/encode custom track format "Turrican 2" (Factor 5)
; :Author. Psygore
; :Version $Id: fmt_turrican2.s 1.5 2005/04/07 23:35:14 wepl Exp wepl $
; :History. 15.14.02 created
; 02.11.02 rework for new sync-search
; 27.02.04 new decode/encode parameters and rework
; :Requires. OS V37+, MC68020+
; :Language. 68020 Assembler
; :Translator. Barfly V2.9
; :To Do.
;---------------------------------------------------------------------------*
; mfm-track structure
;
; $9521 (sync)
; $2AAA (unused)
; $1A90 mfm-words (data)
; 2 mfm-longwords (checksum)
;------------------------------------------
dc.l _decode_turrican2 ;decode
dc.l _encode_turrican2 ;encode
dc.l 0 ;info
dc.l _name_turrican2 ;name
dc.l _sync_turrican1 ;sync
dc.l 0 ;density
dc.w 0 ;index
dc.w 0 ;speclen
dc.w $1A90 ;datalen
dc.w 4+($1A90*2)+8 ;minimal rawlen
dc.w 4+($1A90*2)+8 ;writelen
dc.w TT_TURRICAN2 ;type
dc.w 0 ;flags
_name_turrican2 dc.b "turrican2",0
EVEN
;----------------------------------------
; decode Turrican2 track
; IN: D0 = ULONG length of raw mfm-data in bits
; D1 = ULONG track number
; D2 = ULONG offset in mfm buffer
; A0 = APTR mfm buffer (source)
; A1 = APTR decoded buffer (destination)
; OUT: D0 = BOOL true on success
; all other regs may scratched
_decode_turrican2
move.w #$1A90,d1
bra _decode_tur
;----------------------------------------
; encode Turrican 2 track
; IN: D0 = ULONG track number
; A0 = APTR destination buffer
; A1 = APTR source data to encode
; OUT: D0 = mfmdata length written, 0 means error
; all other regs may scratched
_encode_turrican2
move.w #$1A90,d1
bra _encode_tur