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{{dangerous version|Mining an empty jukebox creates an invisible "Air" item. Interacting with the item will crash the game and likely delete the chunk the jukebox was in.<ref>{{bug|MC-2711}}</ref>|type=file-damage|version=development|edition=Java}}
{{Infobox version
|title=13w01a
|image=13w01a Banner.png
|image2=Java Edition 13w01a.png
|edition=java
|type=Snapshot
|parent=1.5
|date=January 3, 2013
|clientdl=[https://vault.omniarchive.uk/archive/java/client-release/1.5/pre/13w01a.jar Client] ([https://meta.celestia.sh/versions/v1/13w01a.json .json])
|serverdl=[https://vault.omniarchive.uk/archive/java/server-release/1.5/pre/13w01a.jar Server]
|exedl=[https://vault.omniarchive.uk/archive/java/server-release/1.5/pre/13w01a.exe .exe]
[[Category:Versions using legacy download site]]
|prevparent=1.4.7
|next=13w01b
|nextparent=1.5.1
}}<onlyinclude>

'''13w01a''' is the first [[Minecraft:snapshot]] for [[Minecraft:Java Edition 1.5]], released on January 3, 2013.<ref>https://web.archive.org/web/20130106004940/http://www.mojang.com/2013/01/minecraft-snapshot-13w01a/</ref> It mainly added an assortment of new [[Minecraft:redstone components]]. This is the first snapshot released in 2013.

== Additions ==
=== Blocks ===
'''[[File:Nether Quartz Ore JE1 BE1.png|32px]] [[Minecraft:Nether quartz ore]]'''
* New ore exclusive to the Nether.
* Drops 1 [[Minecraft:Nether quartz]] item when mined.
* Generates around [[Minecraft:netherrack]].

'''[[File:Block of Redstone JE1 BE1.png|32px]] [[Minecraft:Block of redstone]]'''
* Stores redstone dust similar to [[Minecraft:blocks of diamond]], etc.
* Emits constant redstone power.
* Works as a pushable redstone power source.

'''[[File:Daylight Detector.png|32px]] [[Minecraft:Daylight sensor]]s'''
* Output power while receiving sunlight.
* The level varies depending on the time (more sunlight = more redstone power), and it does not function at night.

'''[[File:Hopper (D) JE1.png|32px]] [[Minecraft:Hopper]]s'''
* Places and takes out items in hoppers, [[Minecraft:chest]]s, [[Minecraft:furnace]]s, [[Minecraft:minecarts with chests]], [[Minecraft:dispenser]]s, and [[Minecraft:brewing stand]]s.
* Allows for the automation of many processes.
* Still a work in progress (as indicated by the inventory icon [[File:Hopper (item) JE1.png|32px]]).

'''[[File:Redstone Comparator (S) JE1.png|32px]] [[Minecraft:Redstone comparator]]'''
* Has 3 inputs and 1 output. Input from the back is considered signal A, and whichever side gives the stronger signal is considered signal B.
* Has 2 modes: comparison and subtraction.
* In comparison mode, if A≥B, the output is A, otherwise output stays off.
* In subtraction mode, if A≥B, the output is A-B, otherwise output stays off.
* Replacement for the "capacitor" idea.

'''[[File:Trapped Chest.gif|32px]] [[Minecraft:Trapped chest]]s'''
* Gives out a signal depending on the amount of players looking inside. 1 player = 1 strength signal, 2 players = 2, etc.
* Crafted with a [[Minecraft:chest]] and a [[Minecraft:tripwire hook]].
* Large trapped chests can be staggered with large chests to allow more compact storage.
* Texture is slightly different than a normal chest, with a red stain around the latch.

'''[[File:Light Weighted Pressure Plate JE1 BE1.png|32px]] [[File:Heavy Weighted Pressure Plate JE1 BE1.png|32px]] [[Minecraft:Weighted pressure plate]]s'''
* Detects item stacks.
* [[Minecraft:Light Weighted Pressure Plate|Gold]] version reaches full strength at 60 items.
* [[Minecraft:Heavy Weighted Pressure Plate|Iron]] version reaches full strength at 600 items.
* Linear, so 10 strength signal means twice as many items as a 5 strength signal.

=== Items ===
'''[[File:Nether Brick JE1 BE1.png|32px]] [[Minecraft:Nether brick]]'''
* Used for crafting [[Minecraft:Nether bricks]].
* Obtained by smelting [[Minecraft:netherrack]].

'''[[File:Nether Quartz JE1 BE1.png|32px]] [[Minecraft:Nether quartz]]'''
* Item dropped from [[Minecraft:Nether quartz ore]].

== Changes ==
=== Blocks ===
'''[[File:Locked chest JE4.png|32px]] [[Minecraft:Locked chest]]s'''
* Texture for the block was changed from [[File:Locked chest JE3.png|32px]].

'''[[Minecraft:Piston]]s'''
* Are more stable from previous versions.
** Sticky pistons are less sticky.{{info needed}}

'''[[Minecraft:Redstone circuit]]s'''
* Are now more consistent.

=== Items ===
'''General'''
* Now shows the item name in-game.

=== Gameplay ===
'''[[Minecraft:Death messages]]'''
* Now show the weapon someone was killed with.{{info needed}}

'''Inventory management'''
* Double-click items to fill the stack up as much as possible.
* Drag item stacks around to divide them up over the dragged-over slots.
* Drag item stacks around with the right mouse button to place one of that stack in each dragged-over slot, if that slot is not occupied already.
* Shift double-click an item stack to move all other item stacks of that kind to that part of the inventory.
* Press {{key|Q}} while the mouse is over an item in the inventory or a container to drop it.

== Bugs ==
* [MC-5711] Redstone torches attached to the side of a block do not pop off if the block supporting them is destroyed.
* [MC-5721] Dragging to spread an item out in the Creative inventory, then clicking on the inventory tab, and placing the 0 stack item down, the game crashes.
* [MC-5728] Infinite loop caused by subtraction mode comparators causes the world to be unplayable.
* Mineral duplication: players can exponentially dupe minerals by putting then in a crafting table with a block of their material, then double clicking on a mineral in the crafting table, works on the same principle as the method below.
* Crafted item duplication: any stackable crafted item can be duplicated by setting up its recipe in a crafting table, then double clicking an existing version of this item in the inventory. Requires at least one of that item to be present in the inventory.

== Fixes ==
{{fixes|fixedin=13w01a|prefix=Snapshot
|;old
|177|''[12w26a]'' Clocked piston arm turns invisible when exiting game/dying/etc.
|184|''[Beta 1.2]'' (Powered) redstone doesn't update right.
|5621|''[Beta 1.7]'' Blocks like redstone dust, repeaters, doors, and levers don't drop when the underlying block is pushed by a piston.
}}</onlyinclude>

== Gallery ==
<gallery>
13w01atorches.png|A bug with torches in this version.
</gallery>

== Trivia ==
* Along with [[Minecraft:18w01a]], 13w01a was released on the earliest calendar year out of all snapshots, on January 3.
** Until this point, the snapshot released on the earliest calendar year out of all snapshots was [[Minecraft:12w01a]] on January 5.
* 13w01a is the first snapshot to feature a [[Minecraft:version banner]] alongside the official changelog.

== References ==
{{reflist}}

== Navigation ==
{{Navbox Java Edition versions|1.0}}

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Minecraft:Java Edition 13w01a - Revision history

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