                            TECHNICAL SPECIFICATIONS                          
                                                  
                                                                              
     RAD file format is as follows: (values in hex)

   
    HEADER                                                                 
   
    Offset  00..0F:"RAD by REALiTY!!" - Use this to recognize a RAD tune.  
                                        Just detecting the initial "RAD"   
                                        should be sufficient though! ;-)   
                                                                           
    Offset      10:BCD                - Version of RAD file.               
                                        Currently 10h for v1.0.            
                                                                           
    Offset      11:Bit 7              - Set if a description follows.      
                   Bit 6              - Set if it's a "slow-timer" tune.   
                   Bits 4..0          - The initial speed of the tune.     
                                                                           
   
    DESCRIPTION                                                            
   
    The description follows the header if Bit 7 of Offset 11h is set.  The 
    description is a null-terminated string.  To save some space in the    
    tune file, the characters mean:                                        
                                                                           
    Char 00      - End of description (null-terminator)                    
    Char 01      - Move to start of next line (Carriage return)            
    Char 02..1F  - Output this many spaces                                 
    Char 20..FF  - Output this character                                   
                                                                           
   
    INSTRUMENTS                                                            
   
    Next come the instruments:                                             
                                                                           
    Offset      00:Instrument Number that follows (or 0 for end of list)   
                                                                           
    Offset  01..0B:The instrument definition in HSC .INS format:           
                                                                           
             ͻ          
                                       Adlib Register                  
              Byte  Carrier/Modulator  (Relative to Chan. 0)           
             ͹          
               00    Carrier             23h                           
               01    Modulator           20h                           
               02    Carrier             43h - Instr. Volume           
               03    Modulator           40h                           
               04    Carrier             63h                           
               05    Modulator           60h                           
               06    Carrier             83h                           
               07    Modulator           80h                           
               08    Both                C0h                           
               09    Carrier             E3h                           
               0A    Modulator           E0h                           
             ͼ          
                                                                           
   
    ORDER LIST                                                             
   
    The Order List follows the instruments:                                
                                                                           
    Offset      00:Length of Order List (up to 128)                        
                                                                           
    Offset  01..nn:List of orders, one byte for each line:                 
                                                                           
                   00..1F:The pattern to play.                             
                   80..FF:The line to jump to minus 80h (Jump Marker)      
                                                                           
   
    PATTERN OFFSET TABLE                                                   
   
     For all 32 patterns there is a word in this table which gives the     
     offset from the start of the file of the pattern data.                
     If a pattern is empty then the offset is zero.                        
                                                                           
   
    PATTERNS                                                               
   
    Offset      00:Line number whose notes follow.  Bit 7 set means that   
                   this is the last line.  Note, lines that have no notes  
                   or effects on do not appear.                            
                                                                           
    Offset  01....:List of notes for that line:                            
                                                                           
                 Offset     00:Channel no. note appears in (0 to 8).       
                               Bit 7 set means this is the last note for   
                               this line.                                  
                 Offset 01..02:The note/effect for this channel.           
                               If the effect nibble is non-zero then       
                               Offset 03 contains the parameter, otherwise 
                               the next channel starts at Offset 03.       
                                                                           
   
    NOTES                                                                  
   
    Notes occupy three bytes (two if the effect nibble is zero):           
                                                                           
              Byte 00:Bit    7:  Bit 4 of the instrument number.           
                      Bit 6..4:  Octave of note.                           
                      Bit 3..0:  Note (1-12) in this order:                
                                 C#, D, D#, E, F, F#, G, G#, A, A#, B, C   
                                 A zero denotes no note and 15 denotes a   
                                 KEY-OFF.                                  
                                                                           
              Byte 01:Bit 7..4:  Bits 3 to 0 of the instrument number.     
                      Bit 3..0:  The effect nibble (the effect column      
                                 in RAD is the hex equivalent of this      
                                 nibble).                                  
                                                                           
              Byte 02:The parameter to the effect (if any).                
                      Because parameters only go from 0 to 99, bit 7 is    
                      not used, but may be used in a later version of RAD. 
                                                                           
   

 - Shayde / Reality, Feb95
Ripped by: fh94.3 (fh@viktoria.drp.fmph.uniba.sk)