diff --git a/libsrc/atari/fd.inc b/libsrc/atari/fd.inc
new file mode 100644
index 000000000..e59fca562
--- /dev/null
+++ b/libsrc/atari/fd.inc
@@ -0,0 +1,19 @@
+;
+; Christian Groessler, Oct-2000
+;
+; offsets and defines for fdtable (internal use only)
+;
+
+MAX_FD_INDEX	=	12
+MAX_FD_VAL	=	8	; we have 8 IOCBs
+
+ft_entrylen = 4	; length of table entry (it's not sufficient to change here!
+		; the code sometimes does two bit shifts to multiply/divide by
+		; this length)
+
+ft_usa  = 0	; usage counter
+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:)
+