I just ran some gcode to drill a deep hole using peck drilling, but instead it just plunged straight to the bottom of the hole (no pecking). It simulates fine in my CAM software. Here is the script I used:
Code:(1001) (T1 D=4. CR=0. TAPER=118DEG - ZMIN=-18. - DRILL) G90 G94 G91.1 G40 G49 G17 G21 (DRILL2) M5 M9 T1 M6 S4850 M3 G54 G0 A0. M900 G0 X0. Y0. G43 Z20. H1 Z15. G98 G83 X0. Y0. Z-18. R5. Q2. F485. G80 Z20. M901 M30