To be activated in the Match-Up screen:

 Mega Dunks     Left, Right, Up, Down, Left, Right
 Hard Push      Left, Left, Right, Right, Up, Up
 Turbo          Down, Down, Down, Turbo, Turbo, Turbo
 Quick Hands    Down, Turbo, Down, Turbo, Down, Turbo
 Offense        Turbo, Turbo, Turbo, Shoot, Shoot, Shoot
 3 Pointers     Shoot, Shoot, Shoot, Up, Up, Up
 Goal Tend      Turbo, Turbo, Up, Turbo, Turbo
 On Fire        Shoot, Shoot, Down, Shoot, Shoot
 Big Heads      Down, Down, Down, Shoot, Shoot, Shoot
 Shrink Players Turbo, Shoot, Turbo, Shoot, Turbo, Shoot
 ???            Turbo, Turbo, Shoot, Shoot, Turbo, Turbo
 ???            Up, Shoot, Up, Shoot, Up, Shoot

 Secret Players:

 You must press the function keys while you enter the initials and
 date. There are four different sets of keys. F1-F5, F6-F10, F10-F6,
 and F5-F1.

 For example: Larry Bird is LAR Jan 15.
 Enter the record: F1, L, F2, A, F3, R, F4, Jan, F5, 15.

 F1-F5   SEM  Oct 23   Semmens
 F6-F10  JAX  Mar 01   Jax
 F10-F6  STH  Dec 08   Magic Hair
 F5-F1   JF   Nov 16   Adam
 F1-F5   HOG  Dec 31   Hodgeson
 F6-F10  AIR  Jan 21   Air Dog
 F10-F6  APE  Apr 02   Gorilla
 F5-F1   ADR  Apr 06   Adrock
 F1-F5   BAR  Apr 09   Hutchinson
 F6-F10  BAA  Jul 12   McHugh
 F10-F6  BEN  Sep 20   Benny
 F5-F1   BLZ  Jan 14   Blaze
 F1-F5   BIL  Jun 03   Bill Clinton
 F6-F10  CAT  Jan 02   Catling
 F10-F6  CHR  Dec 18   Kirby
 F5-F1   CHD  May 05   Chow Chow
 F1-F5   CAL  Mar 25   Carlton
 F6-F10  CHA  May 04   Prince Charles
 F10-F6  DAN  Jan 02   Weasel
 F5-F1   DIV  Jul 03   Divita
 F1-F5   DEL  Oct 19   Facime
 F6-F10  DAZ  Aug 06   Daz
 F10-F6  FNK  Jan 08   Thomas
 F5-F1   FRS  Feb 02   Fresh Prince
 F1-F5   GOW  Jul 17   Brutah
 F6-F10  GUN  Jan 11   Fumungus
 F10-F6  GOS  Jan 06   Goskie
 F5-F1   GOR  Jul 03   Gordon
 F1-F5   HEA  Jan 09   Heavy D
 F6-F10  HIL  Nov 06   Hilary Clinton
 F10-F6  HOR  Jun 12   Hugo
 F5-F1   JAZ  Oct 09   Jazzy Jeff
 F1-F5   JAY  Aug 24   Jay Moon
 F6-F10  KUB  Apr 14   Kabuki
 F10-F6  LIZ  Aug 07   Max
 F5-F1   LIP  Jan 14   Liptak
 F1-F5   LAR  Jan 15   Larry Bird
 F6-F10  M D  Jul 01   Mike D
 F10-F6  MCA  Apr 09   MCA
 F5-F1   MOE  Jun 08   Moore
 F1-F5   MUS  Dec 24   Mad mike
 F6-F10  REV  Jul 06   Rivett
 F10-F6  REN  Feb 04   Renaldo
 F5-F1   SAW  Apr 10   Sequoia
 F1-F5   SHY  Jun 08   Shelly
 F6-F10  SAT  May 07   Tunnicliff
 F10-F6  SNK  Jun 15   Snake
 F5-F1   THI  Nov 01   Boo Boo
 F1-F5   TUR  Jan 31   Turmell
 F6-F10  TOM  Feb 19   Higgins
 F10-F6  WAN  Jun 10   Pistol
 F5-F1   WOL  Mar 07   Crunch
 F1-F5   ZIG  Apr 07   Ziggy