Heretic

Little known trick: to get Heretic to run on a 386, start the
game with HERETIC -DEBUG

The following cheat codes work everywhere except the 5th difficulty
level.

IDDQDÿÿÿÿÿÿÿÿÿÿ - Instant Death
IDKFAÿÿÿÿÿÿÿÿÿÿ - No Weapons/Ammo
COCKADOODLEDOO  - Turns yourself into a chicken
ENGAGExxÿÿÿÿÿ   - Level Warp (episode/map)
GIMMExxÿÿÿÿÿ    - Artifacts (a-j) (1-9) [d does not work]
ÿÿÿÿÿA  - Ring
ÿÿÿÿÿB  - Mask (Invisibility)
ÿÿÿÿÿC  - Potion
ÿÿÿÿÿE  - Tome of Power
ÿÿÿÿÿF  - Torch
ÿÿÿÿÿG  - Hour Glass (Time Bomb)
ÿÿÿÿÿH  - Eggs (Turn People into Chickens)
ÿÿÿÿÿI  - Golden Wings
ÿÿÿÿÿJ  - Chaos device (warp to start of level)
KITTYÿÿÿÿÿÿÿÿÿÿ - Toggle Clipping
MASSACREÿÿÿÿÿ   - Kills ALL monsters on level
PONCEÿÿÿÿÿÿÿÿÿÿ - Full Health
QUICKENÿÿÿÿÿ    - God Mode
RAMBOÿÿÿÿÿÿÿÿÿÿ - All Weapons/Ammo
RAVMAPÿÿÿÿÿÿÿÿÿÿ- Changes Map Mode [must be in map mode]
SHAZAMÿÿÿÿÿÿÿÿÿÿ- Toggles Weapon Power
SKELÿÿÿÿÿÿÿÿÿÿ  - All Skeleton Keys
TICKERÿÿÿÿÿÿÿÿÿÿ- FPS Display

[Note: type -ravpic at startup and use F1 for screen shots]

Offsets in SAVEGAME files in hex (hex editing again?  Arrgh.)

60 - Healthÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ -(0-200)
64 - Armorÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ  -(0-200)
68 - Shieldÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ -Numbers= 01
6C - Icon at Inventory loacation number #1ÿÿÿÿÿ-Icons  - 01=Ring
70 - Number of inventory item #1ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ   - 02=Mask
74 - Icon at Inventory loacation number #2ÿÿÿÿÿÿÿÿÿÿ   - 03=Potion
78 - Number of inventory item #2ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ   - 04=
7C - Icon at Inventory loacation number #3ÿÿÿÿÿÿÿÿÿÿ   - 05=Book
80 - Number of inventory item #3ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ   - 06=Torch
84 - Icon at Inventory loacation number #4ÿÿÿÿÿÿÿÿÿÿ   - 07=Hour Glass
88 - Number of inventory item #4ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ   - 08=Egg
8C - Icon at Inventory loacation number #5ÿÿÿÿÿÿÿÿÿÿ   - 09=Golden Wings
90 - Number of inventory item #5
94 - Icon at Inventory loacation number #6ÿÿÿÿÿ-Numbers= 01-63hex (1-99).
98 - Number of inventory item #6
9C - Icon at Inventory loacation number #7
A0 - Number of inventory item #7
A4 - Icon at Inventory loacation number #8
A8 - Number of inventory item #8
E4 - Number of Items in inventoryÿÿÿÿÿÿÿÿÿÿ    -Numbers= 00-08
10C - Yellow Keyÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ  -Numbers= 01=YES
110 - Green Key
114 - Blue Key
134 - Staff
138 - Wand
13C - Crossbow
140 - Dragon's Claw
150 - Gloves
158 - Wand Ammoÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ   -Numbers= 0-03E7 (0-999)
15C - Crossbow Ammo
160 - Dragon's Claw Ammo
174 - Wand Max Ammo
178 - Crossbow Max Ammo
17C - Dragon's Claw Max Ammo
190 - God mode and clippingÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ-God=02, Clipping=01, Both=03
EC - Ring Time  (Low Adress)ÿÿÿÿÿÿÿÿÿÿÿÿÿ   -1 minute = 0834hex
ED - Ring Time  (High Address)
F0 - Mask Time  (Low Adress)
F1 - Mask Time  (High Address)
F8 - Torch Time (Low Adress)
F9 - Torch Time (High Address)
FC - Book Time  (Low Adress)
FD - Book Time  (High Address)
100 - Wing Time  (Low Adress)
101 - Wing Time  (High Adress)
High Adress)