2016



     to $33F) by the FMS initialization routine. When CIO needs to
     call an FMS function, it will locate the address of that function via
     the handler address table. See Chapters 8-11 of Inside Atari
     DOS, published by COMPUTE! Books.

2016           7E0            DINT
     FMS initialization routine. The entry point is 1995 ($7CB). DUP
     calls FMS at this point. K-DOS uses the same location for its
     initialization routine.

2219           8AB            DFMOPN
     OPEN routines, including open for append, update, and output.

2508           900            DFMPUT
     PUT byte routines.

2591           A1F            WTBUR
     Burst I/O routines.

2592-2773      A20-AD5        ....
     In COMPUTE!, May and July 1982, Bill Wilkinson discussed
     BURST I/O, which should not take place when a file is OPEN for
     update, but does, due to a minor bug in DOS 2.0 (see also Inside
     Atari DOS, Chapter 12). This will cause update writes to work
     properly, but update reads to be bad. The following POKEs will
     correct the problem. Remember to save DOS back to a new disk.

     POKE 2592,130         ($A20,82)
     POKE 2593,19          ($A21,13)
     POKE 2594,73          ($A22,49)
     POKE 2595,12          ($A23,0C)
     POKE 2596,240         ($A24,F0)
     POKE 2597,36          ($A25,24)
     POKE 2598,106         ($A26,6A)
     POKE 2599,234         ($A27,EA)
     POKE 2625,16          ($A41,10)
     POKE 2773,31          ($AD5,1F)

     (Note that the July 1982 issue of COMPUTE! contained a typo
     where the value to be POKEd into 2773 was mistakenly listed as
     13, not 31!) Wilkinson points out that one way to completely
     disable BURST I/O (useful in some circumstances such as using
     the DOS BINARY SAVE to save the contents of ROM to disk!) is
     by:

     POKE 2606,0           ($A2E,0)

     This, however, will make the system LOAD and SAVE files
     considerably more slowly, so it's not recommended as a
     permanent change to DOS.