RAM	BYTES	USED BY	ORIGINALLY USED FOR
$7E:0058	1 byte	objectool04.asm, Barker Duck,	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:005C	1 byte	AirMeter/Panic (Sprite 82), Barker Duck,	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:0060	4 bytes*	title.asm, Barker Duck(61)	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:0062	?	leodspr.asm, Barker Duck
$7E:0079	1 byte	DisableFireCape.asm/NewCart.asm	Empty. Cleared on reset, titlescreen load, overworld load and level load.
$7E:007C	1 byte	Barker Duck	Empty. Cleared on reset, titlescreen load, overworld load and level load.
$7E:0087	1 byte	Barker Duck\IRQhack	Empty. Cleared on reset, titlescreen load, overworld load and level load.
$7E:00F0	16 bytes	DO NOT USE	Used by Lunar Magic for various purposes. $7E:00FE is the current level number plus 1 (so Yoshi's Island 1 would store #$0106 here). It's used for the custom palette loading code. #$0000 means that the custom palette won't be loaded (this is probably used for castle intros and/or credits). The rest is unknown. Originally, this address is empty, and it's cleared at reset, titlescreen and overworld load.
$7E:0695	108 bytes	DO NOT USE	Empty. Cleared on reset and titlescreen load. 100 bytes used in LM 1.70+ for VRAM modification.
$7E:0AF5	1 byte	Barker Duck	Cleared on reset and titlescreen load. Also cleared after a boss had been beaten - this can be disabled by changing [9C 5C 0A] at $00:B08D/0x328D to [80 01 EA].
$7E:0D9C	1 byte	Empty	Empty. Cleared on reset and titlescreen load.
$7E:0DA1	1 byte	Hindenbird	Empty. Cleared on reset and titlescreen load.
$7E:0DC3	4 bytes	Owcounter.asm, Barker Duck, HindenBird	Empty. Cleared on reset and titlescreen load. $7E:0DC3 is also cleared when selecting how many players to use, but this can be disabled with no known side effects by setting $00:9E48/0x2048 to [80 01 EA].
$7E:0DD4	1 byte	Empty	This address is only referenced once, and may be regarded as the low byte of $7E:0DD5. Its value is never used, nor is anything ever stored to it, and so it can be used as free RAM. Cleared on reset and titlescreen load.
$7E:0DD9	1 byte	objectclipping.asm, Hindenbird	Empty. Cleared on reset and titlescreen load.
$7E:0DDB	3 bytes	objectclipping.asm	Empty. Cleared on reset and titlescreen load.
$7E:0F3A	6 bytes	Hindenbird	Empty. Cleared on reset and titlescreen load.
$7E:0F42	6 bytes	LASM 147	Empty. Cleared on reset and titlescreen load.
$7E:0F5E	20 bytes*	Barker Duck (&0F9A)	Empty. Cleared on reset and titlescreen load. This table was probably meant to function as a cluster sprite table, but it was never used as such.
$7E:0F70		Hindenbird
$7E:13C0	?	Windowing.asm
$7E:13C8	1 byte	LASM BB, 171, HindenBird, Barker Duck	Empty. Cleared on reset and titlescreen load.
$7E:13D8	1 byte	Barker Duck, Hindenbird	Empty. Cleared on reset, titlescreen load, overworld load and level load.
$7E:13E6	2 bytes	OWMusic.asm,Barker Duck,LakituFixSpecial	Empty. Cleared on reset, titlescreen load, overworld load and level load.
$7E:13F2	1 byte	Hindenbird,LakituFixSpecial	Cleared on reset, titlescreen, overworld and cutscene load.
$7E:140A	1 byte	deathfix	Empty. Cleared on reset, titlescreen load, overworld load and during part of the cape flight routine.
$7E:140B	2 bytes	Barker Duck	Empty. Cleared on reset, titlescreen load, overworld load, cutscene load and level load.
$7E:1415	2 bytes	Barker Duck(&1416)	Empty. Cleared on reset, titlescreen load, overworld load and cutscene load.
$7E:145E	2 bytes	Barker Duck	Empty. Cleared on reset, titlescreen load, overworld load and cutscene load.
$7E:1461	1 byte	Empty	Empty. Cleared on reset, titlescreen load, overworld load and cutscene load. This byte functions as the "high byte" of $7E:1460. SMW does not actually use this byte, however it is overwritten during level load (see $05:BE92). Cleared on reset, titlescreen, overworld, level (with the exception of boss rooms) and cutscene load.
$7E:146C	4 bytes	Barker Duck	Empty. Cleared on reset, titlescreen load, overworld load and cutscene load.
$7E:1473	1 byte	Barker Duck	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:1475	1 byte	Barker Duck	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:1477	1 byte	Empty	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:1479	1 byte	Empty	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:147B	1 byte	Barker Duck	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:147D	1 byte	Barker Duck	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:1487	4 bytes	Antigravity Patch	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:14AC	1 byte	Empty	Empty. However, due to the code at $00:C563/0x04763 and $00:C513/0x04713, it decrements every fourth frame until it hits zero.
$7E:14BE	1 byte	Barker Duck, Hindenbird	Empty. Cleared on reset, titlescreen load, overworld load and cutscene load.
$7E:14C1	1 byte	Empty	Empty. Cleared on reset, titlescreen, overworld and cutscene load.
$7E:14C4	1 byte	Empty	Empty. Cleared on reset, titlescreen, overworld and cutscene load.
$7E:14C7	1 byte	Empty	Empty. Cleared on reset, titlescreen, overworld and cutscene load.
$7E:15E8	1 byte	LASM:Level2E	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:1696	1 byte	Hindenbird	Empty. Cleared on reset, titlescreen load, overworld load, cutscene load and level load.
$7E:17BB	1 byte	Empty	Contains the low byte of the level number when loading the levels, but never read by anything. It's cleared when the loading is done. Can be used as freeram.
$7E:1864	1 byte	Empty	Empty. Cleared on reset, titlescreen load, overworld load and level load.
$7E:1869	2 bytes	Hindenbird	Empty. Cleared on reset, titlescreen load, overworld load and level load.
$7E:1879	1 byte	Empty	Empty. Cleared on reset, titlescreen load, overworld load and level load.
$7E:188A	1 byte	Empty	Empty. Cleared on reset, titlescreen load, overworld load and level load, but also on death ($00:F625/0x7825) and in the Peach Rescued scene ($03:AE39/0x1B039).
$7E:188E	1 byte	Empty	Empty. Cleared on reset, titlescreen load, overworld load, cutscene load and level load.
$7E:18A6	1 byte	mechatree.asm	Unused RAM. Referenced at $01CF9E (Morton's code) but never actually used. Cleared on reset, titlescreen load, overworld load and level load.
$7E:18B4	1 byte	Barker Duck	Empty. Cleared on reset, titlescreen load, overworld load and level load.
$7E:18B7	1 byte	Barker Duck	Empty. Cleared on reset, titlescreen load, overworld load and level load.
$7E:18BB	1 byte	Barker Duck	Empty. Cleared on reset, titlescreen load, overworld load and level load.
$7E:18C5	8 bytes	Barker Duck	Empty. Cleared on reset, titlescreen load, overworld load and level load.
$7E:18CA-B	2 bytes	NMSTL.asm
$7E:18D8	1 byte	Empty	Empty. Cleared on reset, titlescreen load, overworld load, cutscene load and level load.
$7E:18DB	1 byte	Empty	Set to #$08 at $00:CDD4 (unreachable by default) and never touched again. Might have been intended as a starting index for the player's fireballs. Cleared on reset, titlescreen load, overworld load and level load.
$7E:18E6	1 byte	Empty	Empty. Cleared on reset, titlescreen load, overworld load and level load.
$7E:18F6	1 byte	Empty	Empty. Cleared on reset, titlescreen load, overworld load, cutscene load and level load.
$7E:1908	1 byte	Empty	Empty. Cleared on reset, titlescreen load, overworld load and level load.
$7E:191B	1 byte	Empty	Empty. Cleared on reset, titlescreen load, overworld load, and every frame when Yoshi is on screen. The latter can be disabled by changing [9C 1B 19] at $01:EBD9/0xEDD9 to [80 01 EA].
$7E:191F	1 byte	Empty	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:1923	2 bytes	Hindenbird	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:1926	2 bytes	Hindenbird	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:1929	1 byte	Empty	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:192C	1 byte	Empty	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:1934	1 byte	Hindenbird	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:1936	2 bytes	Hindenbird	Empty. Cleared on reset, titlescreen load and overworld load.
$7E:1B7F	1 byte	Empty	Empty. Cleared on reset, titlescreen load, overworld load and titlescreen load. This address could be regarded as the "high byte" of $7E:1B7E, however it is never used (AND #$00FF is applied) and only stored to on the overworld. Thus, it is safe to use this address as free RAM outside of the overworld.
$7E:1B97	2 bytes	Empty	This address is only stored to once in all of SMW, and that's in code that was originally never used (the fifth scrolling command, sprite #$EC). It was going to have some unknown use when you reached the last screen of the level. Because SMW never executes the code that writes to it (unless that command is used), this is a safe address to use. Cleared on reset, titlescreen load, overworld load and cutscene load.
$7E:1DEF	1 byte	Empty	Empty. Cleared on reset and titlescreen load.
$7E:1DFD-FF	2 bytes	AMK	Empty. Cleared on reset, titlescreen, overworld and level load (the latter two due to new music banks being uploaded). Note that $7E:1DFD is cleared twice, due to a 16-bit store to $7E:1DFC - at $04:969F/0x2189F (LDA #$0023 : STA $1DFC) and $05:C75D/0x2C95D (LDA #$0009 : STA $1DFC).
$7E:1E00	1 byte	Empty	Empty. Cleared on reset, titlescreen, overworld and level load (the latter two due to new music banks being uploaded).
$7E:1E01	1 byte	Empty	Empty, unused. Cleared on reset and titlescreen load. However, if the debug code at $00:CC86/0x4E86 is enabled, this address allows you to be in free roaming mode: the player can move in any direction, without being affected by objects or sprites. #$00 = none; #$01 = dash immediately; #$02 = free roaming.
$7E:1F2B	3 bytes	Empty	Empty. Cleared at reset and titlescreen load. Unlike most empty addresses, this one is saved to and loaded from SRAM.
$7E:1F3B	1 byte	Empty	Empty. Cleared on reset and titlescreen load.
$7E:1F48	1 byte	Empty	Empty. Cleared on reset and titlescreen load.
$7E:1FFA	1 byte	Hindenbird	Empty. Cleared on reset and titlescreen load.
$7E:1FFF	1 byte	Empty	Empty. Cleared on reset and titlescreen load.
$7E:C100*	1,408 bytes	Empty	Empty, untouched RAM on an unhacked ROM, potentially occupied with extended animated tile graphics in a hacked ROM.
$7E:C271		3D0RedGem.asm(Blue, yellow)
$7E:C275		3D0RedGem.asm(Blue, yellow)
$7E:C400	20 bytes	Doc Cros boss.
$7E:C6E0	288 bytes	Empty	Empty, untouched RAM on an unhacked ROM, potentially occupied with extended animated tile graphics in a hacked ROM.
$7F:8183	504 bytes	DO NOT USE	Empty, untouched RAM. ~420 bytes used in LM 1.70+ for VRAM modification.
$7F:837E-$7F9856		genericuploader.asm
$7F:8827	?	math.asm/thermometer.asm
$7F:888A-8C	-	frankboss.asm/tanuki.asm on 8C
$7F:8900	?	firechomp.asm
$7F:9A7B		math.asm/3C3MathBlock0.asm
$7F:9A7C-7D		3C3MathBlock0-9.asm
$7F:9A7E		math.asm
$7F:9A81		score.asm/2D90eventdoors.asm
$7F:9A82		2DC8RttFDoorA.asm 2DC9RttFDoorB.asm 2DD4doortargets.asm 2DD6flagpole.asm 2DD7failuretele.asm 2DE2RttFDoorC.asm 3CFplacer.asm
$7F:9A83-84	?	2D90eventdoors.asm 3B1doomark1.asm
$7F:9A90
$7F:9B01		3CDAnswerSubmit.asm
$7F:9C7B*	11,141 bytes	Empty	Empty RAM which is entirely untouched. This area is used by many SMW hacking tools, so hacked ROMs are likely to use some of the addresses found here. A list of RAM addresses used by several SMW hacking tools can be found here.
$7F:9D00	40 bytes	Hindenbird
$7f:9E00		HDMA stuff (edit1754)
$7F:A000-4
$7F:A006-7		LASM:Level2E
$7F:A00A-B		LASM:Level2E
$7F:A230-3C	?	timer.asm/2DCBRttFspike.asm
$7F:AB10	?	Various Sprites
$7F:AB28	?	Various Sprites
$7F:AB34	?	npc3.asm
$7F:AB9E	8 bytes	Various Sprites
$7F:ABAA	?	objectclipping.asm
$7F:AC80		asar_patch
$7F:B000	?	AMK?
$7F:B020-22
$7F:B100		390Button1-9.asm, Barker Duck
$7F:B200-21	15 bytes	newcart (sprite)
$7F:B300-30		LASM Level 2E
$7F:B500	400 bytes	Barker Duck
$7F;B603		LASM:Level2E
$7F:C070	?	laser.asm
$7F:C080	?	3D5A-F.asm 360animhurt1-4.asm
$7F:C0FC		3D0RedGem.asm(Blue, yellow) 3D3RedGemActivateBlock.asm (Yellow, Blue)
$7F:C700	96 bytes	CoinDefines.asm
$7F:C770	41 bytes	DKC2_bar.asm, MultimidwayPoints1.3.asm