added some comments

git-svn-id: svn://svn.cc65.org/cc65/trunk@1890 b7a2c559-68d2-44c3-8de9-860c34a00d81

diff --git a/libsrc/atari/fd.inc b/libsrc/atari/fd.inc
index e59fca5629c577750f3af13e41d059c4496038f1..31175b3ca76b3a3a8163b8157be51e099acb3c49 100644 (file)
--- a/libsrc/atari/fd.inc
+++ b/libsrc/atari/fd.inc
@@ -4,7 +4,7 @@
 ; offsets and defines for fdtable (internal use only)
 ;
 
-MAX_FD_INDEX   =       12
+MAX_FD_INDEX   =       12      ; max. # of open fds
 MAX_FD_VAL     =       8       ; we have 8 IOCBs
 
 ft_entrylen = 4        ; length of table entry (it's not sufficient to change here!
@@ -16,4 +16,6 @@ ft_iocb       = 1     ; iocb index (0,$10,$20,etc.), $ff for empty entry
 ft_dev  = 2    ; device of open iocb (0 - device not remembered, eg. filename specified)
 ft_flag = 3    ; flags
                ; lower 3 bits: device number (for R: and D:)
-
+               ; bit 3 - seeking supported by DOS/disk combination
+               ; bit 4 - indicates a fd opened by the program as apposed to the
+               ;         inherited ones from program start (fd 0 to fd 2)