#FILE: binformt.txt #DESC: Format of Dragon Dos binary file #REV: 1.0 #DATE: 27/01/94 #AUTHOR: Graham E.Kinns #DISCLAIMER: All information provided as is etc. #ARCHIVE: This file is part of the DRGNINFO collection of Dragon info files #CONTACT: Comments, bugs, revisions, suggestions to Dragon@grempc.demon.co.uk #HISTORY: 1.0 27/01/94 - Initial version #XREF: basicfmt.txt - tokenised BASIC format # bastoken.txt - BASIC tokens # dostoken.txt - Dragon DOS tokens #TODO: check different filetypes Three standard file types exist under Dragon Dos - these are .DAT - standard data file .BAS - BASIC tokenised file .BIN - binary image file Contents of DAT file are typically in Ascii style text format BAS and BIN are essentially the same - both start with an 9 byte header of the following format: Offset: Type: Value: 0 byte $55 Constant 1 byte 2:3 word 4:5 word 6:7 word 8 byte $AA Constant 9-xxx byte[] NOTE: words are Motorola hi-order format is $01 for BAS $02 for BIN Remainder are undefined under standard Dragon DOS. The type $03 may have been used in DosPlus from Phil Scott for a gapped m/c binary. (?? check) ?? Result on 'RUN'ning a file of the wrong type is not known is the data load address - typically $2401 for a .BAS file although uncertain whether this is actually used. is length if block that follows i.e. complete file should be +9 bytes long is execute address stored in $9d:9e for default EXEC addr if the data/program is LOADed - if the BIN file is RUN this defines the entry point that is jumped to. For a BASIC program this is always $8B8D