Difference between revisions of "Backpack"

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[[Image:BackpackE1M2.png|thumb|A backpack found in a secret area in [[E1M2: Nuclear Plant (Doom)|E1M2: Nuclear Plant]].]]
 
[[Image:BackpackE1M2.png|thumb|A backpack found in a secret area in [[E1M2: Nuclear Plant (Doom)|E1M2: Nuclear Plant]].]]
 +
[[Image:Doom 64 backpack.png|thumb|A backpack at the center of the large staircase in [[Doom 64]] [[MAP19: The Spiral (Doom 64)|MAP19: The Spiral]].]]
  
 
The '''backpack''' is a [[powerup]] that doubles the [[player]]'s [[ammo]]-carrying capacity; after picking up a backpack, the player is able to carry up to 400 [[Clip|bullets]], 100 [[shotgun shells]], 100 [[rocket]]s, and 600 [[Energy cell (Doom)|energy cell units]] at once. When picked up, the backpack also gives the equivalent of the small ammo item for each type of ammunition: 10 bullets, 4 shotgun shells, a rocket, and 20 energy cell units (doubled on the "I'm Too Young To Die" and "Nightmare!" [[skill level]]s).  
 
The '''backpack''' is a [[powerup]] that doubles the [[player]]'s [[ammo]]-carrying capacity; after picking up a backpack, the player is able to carry up to 400 [[Clip|bullets]], 100 [[shotgun shells]], 100 [[rocket]]s, and 600 [[Energy cell (Doom)|energy cell units]] at once. When picked up, the backpack also gives the equivalent of the small ammo item for each type of ammunition: 10 bullets, 4 shotgun shells, a rocket, and 20 energy cell units (doubled on the "I'm Too Young To Die" and "Nightmare!" [[skill level]]s).  
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If the player picks up a subsequent backpack, only the extra ammunition is collected. A backpack can be picked up even when the player cannot carry any more ammo of any type.
 
If the player picks up a subsequent backpack, only the extra ammunition is collected. A backpack can be picked up even when the player cannot carry any more ammo of any type.
  
The backpack's effect lasts until the end of the episode in [[Doom]] and until the end of the game in [[Doom II]]. If the player is killed, ammo capacity returns to normal upon respawn.
+
The backpack's effect lasts until the end of the episode in [[Doom]] and until the end of the game in [[Doom II]] and [[Doom 64]]. If the player is killed, ammo capacity returns to normal upon respawn.
  
Using the [[Doom cheat codes#All Doom versions|cheat code]] {{c|idkfa}} or {{c|idfa}} to give the player all [[weapons]] and maximum ammunition ''does not'' give the player a backpack. The backpack is the only powerup which does not have a corresponding {{c|idbehold}} cheat code.
+
Using the [[Doom cheat codes#All Doom engine versions|cheat code]] {{c|idkfa}} or {{c|idfa}} to give the player all [[weapon]]s and maximum ammunition ''does not'' give the player a backpack. The backpack is the only powerup which does not have a corresponding {{c|idbehold}} cheat code.
  
 
Backpacks are not included in the [[Intermission screen|items percentage]] displayed at the end of each level.
 
Backpacks are not included in the [[Intermission screen|items percentage]] displayed at the end of each level.
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{| {{prettytable}}
 
{| {{prettytable}}
!colspan="2"|Thing attributes
+
!colspan="2"|Backpack data
 
|-
 
|-
| Thing type||8 (decimal), 8 (hex)
+
| [[Thing types|Thing type]]||8 (decimal), 8 (hex)
 
|-
 
|-
| Appears in||[[Shareware]] Doom<br/>Registered Doom<br/>The Ultimate Doom<br/>Doom II/Final Doom
+
| [[Mobj|Enum]]||MT_MISC24 (71)
 +
|-
 +
| Appears in||[[Shareware]] Doom<br>[[Doom]]/[[Ultimate Doom]]<br>[[Doom II]]/[[Final Doom]]<br>[[Doom 64]]/[[The Lost Levels|Lost Levels]]
 
|-
 
|-
 
| Radius||20
 
| Radius||20
Line 26: Line 29:
 
| [[Sprite]]||BPAK
 
| [[Sprite]]||BPAK
 
|-
 
|-
| [[Thing types|Class]]|||[[Item]]<br/>Pickup
+
| Frames||1 [A]
 +
|-
 +
| [[Thing types|Class]]||[[Item]]<br>Pickup
 +
|-
 +
| Flags||{{c|1}} (decimal)<br>{{c|00000001}} (hex)
 +
|-
 +
| Flags list|| 0: Can be picked up
 
|}
 
|}
  
 
== Appearance statistics ==
 
== Appearance statistics ==
In [[classic Doom]], backpacks are first encountered on these levels:
 
  
 +
In the [[IWAD]]s the backpack is first encountered on these maps per [[Skill level#Doom and Doom II skill levels|skill level]]:
 +
 +
{{col-begin}}
 +
{{col-break|width=50%}}
 
{| {{prettytable}}
 
{| {{prettytable}}
!Game||[[I'm Too Young To Die|ITYTD]] and [[Hey, Not Too Rough|HNTR]]||[[Hurt Me Plenty|HMP]]||[[Ultra-Violence|UV]] and [[Nightmare!|NM]]
+
!colspan="4"|Single-player
 +
|-
 +
!Game / ''Episode''!!1-2!!3!!4-5
 +
|-
 +
|''[[Knee-Deep in the Dead]]''||[[E1M2: Nuclear Plant]]||E1M2: Nuclear Plant||E1M2: Nuclear Plant
 +
|-
 +
|''[[The Shores of Hell]]''||[[E2M2: Containment Area]]||E2M2: Containment Area||E2M2: Containment Area
 +
|-
 +
|''[[Inferno]]''||[[E3M3: Pandemonium]]||E3M3: Pandemonium||E3M3: Pandemonium
 +
|-
 +
|''[[Thy Flesh Consumed]]''||[[E4M9: Fear]]||E4M9: Fear||E4M9: Fear
 +
|-
 +
|[[Doom II]]||[[MAP03: The Gantlet]]||MAP03: The Gantlet||MAP03: The Gantlet
 +
|-
 +
|[[TNT: Evilution]]||[[MAP02: Human BBQ]]||MAP02: Human BBQ||MAP02: Human BBQ
 +
|-
 +
|[[Plutonia Experiment]]||[[MAP01: Congo]]||MAP01: Congo||MAP01: Congo
 +
|-
 +
|[[Doom 64]]||[[MAP02: The Terraformer]]||MAP02: The Terraformer||MAP02: The Terraformer
 +
|-
 +
|[[The Lost Levels]]||[[MAP36: Cold Grounds]]||MAP36: Cold Grounds||MAP36: Cold Grounds
 +
|}
 +
{{col-break}}
 +
{| {{prettytable}}
 +
!colspan="4"|Multiplayer
 +
|-
 +
!Game / ''Episode''!!1-2!!3!!4-5
 +
|-
 +
|''Knee-Deep in the Dead''||E1M2: Nuclear Plant||E1M2: Nuclear Plant||E1M2: Nuclear Plant
 +
|-
 +
|''The Shores of Hell''||E2M2: Containment Area||E2M2: Containment Area||E2M2: Containment Area
 +
|-
 +
|''Inferno''||E3M3: Pandemonium||E3M3: Pandemonium||E3M3: Pandemonium
 
|-
 
|-
|[[Ultimate Doom]]||[[E1M2: Nuclear Plant]]||[[E1M2: Nuclear Plant]]||[[E1M2: Nuclear Plant]]
+
|''Thy Flesh Consumed''||E4M9: Fear||E4M9: Fear||E4M9: Fear
 
|-
 
|-
|[[Doom II]]||[[MAP03: The Gantlet]]||[[MAP03: The Gantlet]]||[[MAP03: The Gantlet]]
+
|Doom II||MAP03: The Gantlet||MAP03: The Gantlet||MAP03: The Gantlet
 
|-
 
|-
|[[TNT: Evilution]]||[[MAP02: Human BBQ]]||[[MAP02: Human BBQ]]||[[MAP02: Human BBQ]]
+
|TNT: Evilution||MAP02: Human BBQ||MAP02: Human BBQ||MAP02: Human BBQ
 
|-
 
|-
|[[The Plutonia Experiment|Plutonia]]||[[MAP01: Congo]]||[[MAP01: Congo]]||[[MAP01: Congo]]
+
|Plutonia Experiment||MAP01: Congo||MAP01: Congo||MAP01: Congo
 
|}
 
|}
 +
{{col-end}}
  
The [[IWAD]]s contain the following numbers of backpacks:
+
The IWADs contain the following numbers of backpacks per skill level:
  
{| {{prettytable}}
+
{{col-begin}}
!Game||ITYTD and HNTR||HMP||UV and NM
+
{{col-break|width=50%}}
 +
{| {{prettytable|style=text-align: center;}}
 +
!colspan="4"|Single-player
 +
|-
 +
!Game / ''Episode''!!1-2!!3!!4-5
 +
|-
 +
|style="text-align: left;"|''[[Knee-Deep in the Dead]]''||''10''||''10''||''10''
 +
|-
 +
|style="text-align: left;"|''[[The Shores of Hell]]''||''8''||''8''||''8''
 +
|-
 +
|style="text-align: left;"|''[[Inferno]]''||''4''||''4''||''4''
 +
|-
 +
|style="text-align: left;"|[[Doom|Doom (registered)]]||22||22||22
 +
|-
 +
|style="text-align: left;"|''[[Thy Flesh Consumed]]''||''6''||''6''||''6''
 +
|-
 +
|style="text-align: left;"|[[Ultimate Doom]]||28||28||28
 +
|-
 +
|style="text-align: left;"|[[Doom II]]||48||48||48
 +
|-
 +
|style="text-align: left;"|[[TNT: Evilution]]||31||32||32
 +
|-
 +
|style="text-align: left;"|[[Plutonia Experiment]]||33||33||33
 +
|-
 +
|style="text-align: left;"|[[Doom 64]]||28||28||28
 +
|-
 +
|style="text-align: left;"|[[The Lost Levels]]||4||4||4
 +
|}
 +
{{col-break}}
 +
{| {{prettytable|style=text-align: center;}}
 +
!colspan="4"|Multiplayer
 +
|-
 +
!Game / ''Episode''!!1-2!!3!!4-5
 +
|-
 +
|style="text-align: left;"|''Knee-Deep in the Dead''||''10''||''10''||''10''
 +
|-
 +
|style="text-align: left;"|''The Shores of Hell''||''11''||''11''||''11''
 +
|-
 +
|style="text-align: left;"|''Inferno''||''4''||''4''||''4''
 +
|-
 +
|style="text-align: left;"|Doom (registered)||25||25||25
 +
|-
 +
|style="text-align: left;"|''Thy Flesh Consumed''||''6''||''6''||''6''
 
|-
 
|-
|Ultimate Doom||22||22||22
+
|style="text-align: left;"|Ultimate Doom||31||31||31
 
|-
 
|-
|Doom II||28||28||28
+
|style="text-align: left;"|Doom II||54||54||54
 
|-
 
|-
|TNT: Evilution||48||48||48
+
|style="text-align: left;"|TNT: Evilution||39||44||45
 
|-
 
|-
|The Plutonia Experiment|Plutonia||31||32||32
+
|style="text-align: left;"|Plutonia Experiment||43||43||43
 
|}
 
|}
 +
{{col-end}}
  
 
== Doom 3 ==
 
== Doom 3 ==
Line 62: Line 150:
 
[[Image:Doom3 backpack.png|right|thumb|A backpack lies near its dead owner near the entrance to the [[Delta Labs - Level 1: Union Aerospace Research Division|Delta labs]].]]
 
[[Image:Doom3 backpack.png|right|thumb|A backpack lies near its dead owner near the entrance to the [[Delta Labs - Level 1: Union Aerospace Research Division|Delta labs]].]]
 
The backpack is present in [[Doom 3]], but differs from its classic counterpart that it does not increase the player's carrying capacity. It may contain varying amounts of ammunition, as well as some quantities of health, armor and air supply. It is an uncommon item, being found in few levels, often in secret places.
 
The backpack is present in [[Doom 3]], but differs from its classic counterpart that it does not increase the player's carrying capacity. It may contain varying amounts of ammunition, as well as some quantities of health, armor and air supply. It is an uncommon item, being found in few levels, often in secret places.
 +
 +
The message appearing on the HUD when collecting a backpack is often erroneous; it may say that a variety of ammunition types were collected even if the backpack did not contain all of them.
  
 
When summoned by a [[Doom 3 cheat codes|cheat code]], the backpack will give the player 12 [[Pistol (Doom 3)|pistol]] bullets, 8 [[Shotgun (Doom 3)|shotgun]] shells, 30 [[machine gun]] rounds, 50 [[Chaingun (Doom 3)|chaingun]] rounds, 5 [[grenade]]s, 3 rockets, and 25 cells for the [[Plasma gun (Doom 3)|plasma gun]] &ndash; equivalents of the one "small" pickup for each weapon, much like its classic predecessor. This contradicts the comment in the [[definition file]], which states that backpacks are "empty by default, so designer must choose amounts". For all backpacks placed in the game, however, the latter is true.
 
When summoned by a [[Doom 3 cheat codes|cheat code]], the backpack will give the player 12 [[Pistol (Doom 3)|pistol]] bullets, 8 [[Shotgun (Doom 3)|shotgun]] shells, 30 [[machine gun]] rounds, 50 [[Chaingun (Doom 3)|chaingun]] rounds, 5 [[grenade]]s, 3 rockets, and 25 cells for the [[Plasma gun (Doom 3)|plasma gun]] &ndash; equivalents of the one "small" pickup for each weapon, much like its classic predecessor. This contradicts the comment in the [[definition file]], which states that backpacks are "empty by default, so designer must choose amounts". For all backpacks placed in the game, however, the latter is true.
Line 68: Line 158:
  
 
* It is a misconception that the 10-bullet ammo is an exception to the small-pickup rule, as players are more familiar with the 5-bullet clips dropped by extremely common [[Zombieman|zombiemen]]. The [[clip]] item placed as fixed pickups in levels does indeed contain 10 bullets.
 
* It is a misconception that the 10-bullet ammo is an exception to the small-pickup rule, as players are more familiar with the 5-bullet clips dropped by extremely common [[Zombieman|zombiemen]]. The [[clip]] item placed as fixed pickups in levels does indeed contain 10 bullets.
 +
* In [[shareware]] Doom, where plasma weapons are unavailable, the backpack nevertheless includes cells.
  
 
== See also ==
 
== See also ==
  
 
* [[Bag of Holding]]
 
* [[Bag of Holding]]
* [[Ammo Satchel]]
+
* [[Ammo satchel]]
 
{{Doom items}}
 
{{Doom items}}
  
 
[[Category:Doom ammo]]
 
[[Category:Doom ammo]]
 
[[Category:Doom 3 items]]
 
[[Category:Doom 3 items]]

Revision as of 10:21, 26 September 2022

A backpack found in a secret area in E1M2: Nuclear Plant.
A backpack at the center of the large staircase in Doom 64 MAP19: The Spiral.

The backpack is a powerup that doubles the player's ammo-carrying capacity; after picking up a backpack, the player is able to carry up to 400 bullets, 100 shotgun shells, 100 rockets, and 600 energy cell units at once. When picked up, the backpack also gives the equivalent of the small ammo item for each type of ammunition: 10 bullets, 4 shotgun shells, a rocket, and 20 energy cell units (doubled on the "I'm Too Young To Die" and "Nightmare!" skill levels).

If the player picks up a subsequent backpack, only the extra ammunition is collected. A backpack can be picked up even when the player cannot carry any more ammo of any type.

The backpack's effect lasts until the end of the episode in Doom and until the end of the game in Doom II and Doom 64. If the player is killed, ammo capacity returns to normal upon respawn.

Using the cheat code idkfa or idfa to give the player all weapons and maximum ammunition does not give the player a backpack. The backpack is the only powerup which does not have a corresponding idbehold cheat code.

Backpacks are not included in the items percentage displayed at the end of each level.

Data

Backpack data
Thing type 8 (decimal), 8 (hex)
Enum MT_MISC24 (71)
Appears in Shareware Doom
Doom/Ultimate Doom
Doom II/Final Doom
Doom 64/Lost Levels
Radius 20
Height 16
Sprite BPAK
Frames 1 [A]
Class Item
Pickup
Flags 1 (decimal)
00000001 (hex)
Flags list 0: Can be picked up

Appearance statistics

In the IWADs the backpack is first encountered on these maps per skill level:

The IWADs contain the following numbers of backpacks per skill level:

Doom 3

A backpack lies near its dead owner near the entrance to the Delta labs.

The backpack is present in Doom 3, but differs from its classic counterpart that it does not increase the player's carrying capacity. It may contain varying amounts of ammunition, as well as some quantities of health, armor and air supply. It is an uncommon item, being found in few levels, often in secret places.

The message appearing on the HUD when collecting a backpack is often erroneous; it may say that a variety of ammunition types were collected even if the backpack did not contain all of them.

When summoned by a cheat code, the backpack will give the player 12 pistol bullets, 8 shotgun shells, 30 machine gun rounds, 50 chaingun rounds, 5 grenades, 3 rockets, and 25 cells for the plasma gun – equivalents of the one "small" pickup for each weapon, much like its classic predecessor. This contradicts the comment in the definition file, which states that backpacks are "empty by default, so designer must choose amounts". For all backpacks placed in the game, however, the latter is true.

Notes

  • It is a misconception that the 10-bullet ammo is an exception to the small-pickup rule, as players are more familiar with the 5-bullet clips dropped by extremely common zombiemen. The clip item placed as fixed pickups in levels does indeed contain 10 bullets.
  • In shareware Doom, where plasma weapons are unavailable, the backpack nevertheless includes cells.

See also