mappings and comments for mcp 2.0a/minecraft v1.2.1_01 (client-side)
(last edit 2010-11-08 15:34:13 Central Standard Time)

[Block.java]
field_4069_aI -> cobblestone stairs
field_4068_aJ -> wall sign
field_4067_aK -> lever
field_4066_aL -> stone pressure plate
field_4065_aN -> wood pressure plate
field_4064_aS -> stone button
field_4063_aU -> Ice block
field_4057_ba -> fence
field_4055_bb -> pumpkin
field_4053_bc -> bloodstone
field_4051_bd -> slow hell stone
field_4049_be -> lightstone
field_4047_bf -> portal
field_4045_bg -> lit jack-o-lantern
-------------------------------------------
func_4024_a(StepSound) -> setStepSound

field_4059_au -> wood stairs

(These might not be accepted names; I didn't choose to base my names on soundPowderFootstep)
field_4039_f  -> stepSoundWood
field_4038_g  -> stepSoundDirt
field_4037_h  -> stepSoundGrass
field_4036_i  -> stepSoundStone
field_4035_j  -> stepSoundMetal
field_4034_k  -> stepSoundGlass
field_4033_l  -> stepSoundCloth (also used for snow)
field_4032_m  -> stepSoundSand
--------------------------------------------

[Item.java]
func_4022_a(int) sets the iconIndex (field_4018_aZ).

field_4014_g  -> flint and steel
field_4016_av -> bucketWater
field_4031_aC -> boat
field_4030_aF -> single brick
field_4029_aI -> paper
field_4028_aJ -> book
field_4027_aL -> minecartStorage
field_4026_aM -> minecartPowered
field_4024_aP -> fishing rod
field_4019_aV -> green record

field_4018_aZ -> iconIndex

[ItemMinecart.java]
field_317_a   -> minecart type (0 = normal, 1 = storage, 2 = powered)

[StepSoundStone.java]
This should probably be renamed to StepSoundGlass.java.
"client side refers to glass", plus it's used for the ice, glass, and lightstone blocks.

[BlockStep.java]
field_469_a   -> bFullStep

[ItemPickaxe.java]
func_4018_a(Block) determines which tool level is required for breaking blocks
field_329_aX[] is the array of blocks which can be broken easily
field_328_aY  -> powerLevel (3 = diamond)

[ItemStack.java]
func_1099_b(Block) is called from InventoryPlayer.java canHarvestBlock_00(Block block),
so it likely has something to do with harvesting blocks.

[ScreenShotHelper.java]
func_4148_a(File, int, int) -> saveScreenshot

[RenderPlayer.java]
String field_206_i[] -> armor texture base filenames

[RecipesWeapons.java]
field_1099_b[][] -> swords

[GuiMainMenu.java]
func_4068_a(float) -> renderLogo
field_4187_a       -> minecraftLogo

[CanvasMajongLogo.java]
what the heck is Majong specifications?
CanvasMajongLogo.java -> CanvasMojangLogo.java
unless we're doing this to be copyright-friendly idk

[EntityPlayerSP.java]
func_461_a(String) -> chatMessage (does nothing)

[EntityClientPlayerMP.java]
func_461_a(String) -> chatMessage (sends Packet3Chat)

[GuiIngame]
func_4063_a(int, int) enables the pumpkin blur