ORIGINALLY ;UBLISHED IN LIMA NEWSLETTER SEPTEMBER 1991
 
                        "MUSIC SDA" 
         ANOTHER OFFICIAL TI NEVER RELEASED MODULE  
                 described by Charles Good 
                    Lima Ohio User Group 
      
     This is the MUSIC MAKER module with an extra Grom.
This extra grom turns MUSIC SDA into something really
useful, not just the toy that MUSIC MAKER is.  With MUSIC
SDA you can create music disk files directly usable in
BASIC, GPL, and ASSEMBLY programs..  The title screen says
"copyright 1980 Texas Instruments" and looks identical to
the MUSIC MAKER title screen except that it says "MUSIC SDA"
instead of MUSIC MAKER.  I have no idea what the "SDA"
means.  First you load some music into the module from disk
or tape, or you create some music from within the module in
the same way as is done with MUSIC MAKER.  You are then
presented with the following list of options, two of which
are not found in MUSIC MAKER: 
     --EDIT  
     --PLAY 
     --SAVE (creates a cassette file or a 59 sector disk
file irrespective of how many measures long the music
actually is) 
     --PRINT (only works with the TP, prints music on the
staff) 
     --DUMP (not in MUSIC MAKER) 
     --EXECUTE (not in MUSIC MAKER). 
      
     I am not really sure about the purpose of EXECUTE.  You
are given options to change speed, start and stop measure,
number of voices, etc., just as when you select PLAY.  The
computer then grinds away internally for a while and then
plays the music.  You can speed up the pace of the music
that is played tremendously with EXECUTE, much more so than
with PLAY.  I think you are supposed to EXECUTE if you make
any changes before you DUMP the music. 
      
     DUMP is the really neat feature of MUSIC SDA.  It saves
music to disk in really useful formats, not the "can only be
read into MUSIC MAKER" 59 sector format you get with SAVE.
When DUMP is selected you get these options: 
     1. GPL 
     2. BASIC (DISPLAY FORMAT) 
     3. BASIC (MERGE FORMAT) 
     4. ASSEMBLER 
      
     DUMP GPL creates a DV80 file that can be used as source
code for programming in GPL. 
     DUMP BASIC (DISPLAY) creates a DV80 file that looks
like a TI BASIC program listing.  You can type this list
into TI BASIC or XB  and play the music at the speed
you designated from EXECUTE. 
     DUMP BASIC (MERGE) creates a DV163 file that you can
MERGE into any XB program. 
     DUMP ASSEMBLER makes a DV80 file of the music that can
be used in assembly language programming. 
      
     Thanks to Mike Wright for calling this little gem to my
attention.  I asked Mike what the "SDA"  of MUSIC SDA stands
for.  He is obviously as knowledgable as I am.  "Hell if I
know," he said. 
      
     This would have been a REALLY USEFUL command module if
it had ever been released to the public.  Its title screen
date date suggests that it was in existence in the early
stage.  of the 99/4(A)'s history.  Why was it never
released? My guess is that TI didn't want the public to know
what GPL source code looked like.  We have MUSIC SDA as Gram
Kracker files on disk 585B of the Lima UG library. 
      
     The following are samples of the exact same two
measures saved to disk with DUMP.  Each DUMP automatically
generates comments indicating the title of the music, the
start of each new measure, and the total length of the
dumped music in bytes. 
      .NA 
      .NF 
      .IN 0 
 
---  DUMP GPL ---
*       FUGHETTA
*       MEASURE:  0001
        DATA >03,#>8E0F,>90,>0C
        DATA >02,#>8A0C,>04
        DATA >02,#>830E,>04
        DATA >02,#>8315,>04
        DATA >02,#>8709,>04
        DATA >02,#>8E0B,>04
*       MEASURE:  0002
        DATA >02,#>8A0C,>04
        DATA >02,#>8E0F,>04
        DATA >02,#>8F07,>10
        DATA >02,#>8708,>08
ENDSND  DATA >04,>9F,>BF,>DF,>FF,>00
*       00047 BYTES
 
--- DUMP BASIC DISPLAY ---
20000 REM FUGHETTA
20010 REM MEASURE: 0001
20020 CALL SOUND(0200,00440,00)
20030 CALL SOUND(0067,00554,00)
20040 CALL SOUND(0067,00494,00)
20050 CALL SOUND(0067,00330,00)
20060 CALL SOUND(0067,00740,00)
20070 CALL SOUND(0067,00657,00)
20080 REM MEASURE: 0002
20090 CALL SOUND(0067,00554,00)
20100 CALL SOUND(0067,00440,00)
20110 CALL SOUND(0267,00880,00)
20120 CALL SOUND(0133,00831,00)
20130 REM 00427 BYTES
 
--- DUMP ASSEMBLER ---
*       FUGHETTA
*       MEASURE:  0001
        BYTE >03,>8E,>0F,>90,>0C
        BYTE >02,>8A,>0C,>04
        BYTE >02,>83,>0E,>04
        BYTE >02,>83,>15,>04
        BYTE >02,>87,>09,>04
        BYTE >02,>8E,>0B,>04
*       MEASURE:  0002
        BYTE >02,>8A,>0C,>04
        BYTE >02,>8E,>0F,>04
        BYTE >02,>8F,>07,>10
        BYTE >02,>87,>08,>08
ENDSND  BYTE >04,>9F,>BF,>DF,>FF,>00
*       00047 BYTES
       
     .PL 1