Super Gameboy Boot ROM Commented Disassembly
                                                                     
                                                                     
                                             
	LD SP,FFFE		; $0000  Setup Stack

	LD A,30			; $0003  Setup data line to SNES.
	LD ($FF00+$00),A	; $0005

	XOR A			; $0007  Zero the memory from $8000-$9FFF (VRAM)
	LD HL,$9FFF		; $0008
Addr_000B:
	LD (HL-),A		; $000B
	BIT 7,H			; $000C
	JR NZ, Addr_000B	; $000E

	LD HL,$FF26		; $0010  Setup Audio
	LD C,$11		; $0013
	LD A,$80		; $0015
	LD (HL-),A		; $0017
	LD ($FF00+C),A		; $0018
	INC C			; $0019
	LD A,$F3		; $001A
	LD ($FF00+C),A		; $001C
	LD (HL-),A		; $001D
	LD A,$77		; $001E
	LD (HL),A		; $0020

	LD A,$FC		; $ 0021  Setup BG palette
	LD ($FF00+$47),A	; $ 0023

	LD HL,$C05F		; $0025  Fill C000-C05F with 0104-014F divided into 14-bit packets (each with a command and a checksum)
	LD C,$08		; $0028
	XOR A			; $002A
Addr_002B:
	LD (HL-),A		; $002B
	DEC C			; $002C
	JR NZ, Addr_002B	; $002D
	LD DE,$014F		; $002F
	LD A,$FB		; $0032
	LD C,$06		; $0034
Addr_0036:
	PUSH AF			; $0036
	LD B,$00		; $0037
Addr_0039:
	LD A,(DE)		; $0039
	DEC DE			; $003A
	LD (HL-),A		; $003B
	ADD A,B			; $003C
	LD B,A			; $003D
	DEC C			; $003E
	JR NZ, Addr_0039	; $003F
	LD (HL-),A		; $0041  Resulting memory map:
	POP AF			; $0042  C000-C00F = $F1 ([$0104]+[$0105]+[$0106]+[$0107]+[$0108]+[$0109]+[$010A]+[$010B]+[$010C]+[$010D]+[$010E]+[$010F]+[$0110]+[$0111]) [$0104] [$0105] [$0106] [$0107] [$0108] [$0109] [$010A] [$010B] [$010C] [$010D] [$010E] [$010F] [$0110] [$0111]
	LD (HL-),A		; $0043  C010-C01F = $F3 ([$0112]+[$0113]+[$0114]+[$0115]+[$0116]+[$0117]+[$0118]+[$0119]+[$011A]+[$011B]+[$011C]+[$011D]+[$011E]+[$011F]) [$0112] [$0113] [$0114] [$0115] [$0116] [$0117] [$0118] [$0119] [$011A] [$011B] [$011C] [$011D] [$011E] [$011F]
	LD C,$0E		; $0044  C020-C02F = $F5 ([$0120]+[$0121]+[$0122]+[$0123]+[$0124]+[$0125]+[$0126]+[$0127]+[$0128]+[$0129]+[$012A]+[$012B]+[$012C]+[$012D]) [$0120] [$0121] [$0122] [$0123] [$0124] [$0125] [$0126] [$0127] [$0128] [$0129] [$012A] [$012B] [$012C] [$012D]
	SUB $02			; $0046  C030-C03F = $F7 ([$012E]+[$012F]+[$0130]+[$0131]+[$0132]+[$0133]+[$0134]+[$0135]+[$0136]+[$0137]+[$0138]+[$0139]+[$013A]+[$013B]) [$012E] [$012F] [$0130] [$0131] [$0132] [$0133] [$0134] [$0135] [$0136] [$0137] [$0138] [$0139] [$013A] [$013B]
	CP $EF			; $0048  C040-C04F = $F9 ([$013C]+[$013D]+[$013E]+[$013F]+[$0140]+[$0141]+[$0142]+[$0143]+[$0144]+[$0145]+[$0146]+[$0147]+[$0148]+[$0149]) [$013C] [$013D] [$013E] [$013F] [$0140] [$0141] [$0142] [$0143] [$0144] [$0145] [$0146] [$0147] [$0148] [$0149]
	JR NZ, Addr_0036	; $004A  C050-C05F = $FB ([$014A]+[$014B]+[$014C]+[$014D]+[$014E]+[$014F]) [$014A] [$014B] [$014C] [$014D] [$014E] [$014F] $00 $00 $00 $00 $00 $00 $00 $00

	LD DE,0104		; $004C  Convert and load logo data from cart into Video RAM
	LD HL,8010		; $004F
Addr_0052:
	LD A,(DE)		; $0052
	CALL Addr_00D3		; $0053
	CALL Addr_00D4		; $0056
	INC DE			; $0059
	LD A,E			; $005A
	CP $34			; $005B
	JR NZ, Addr_0052	; $005D

	LD DE,00E6		; $005F  Load (R) sign into Video RAM
	LD B,08			; $0062
Addr_0064:
	LD A,(DE)		; $0064
	INC DE			; $0065
	LD (HL+),A		; $0066
	INC HL			; $0067
	DEC B			; $0068
	JR NZ, Addr_0064	; $0069

	LD A,$19		; $006B  Setup background tilemap
	LD ($9910),A		; $006D
	LD HL,$992F		; $0070
Addr_0073:
	LD C,0C			; $0073
Addr_0075:
	DEC A			; $0075
	JR Z, Addr_0080		; $0076
	LD (HL-),A		; $0078
	DEC C			; $0079
	JR NZ, Addr_0075	; $007A
	LD L,0F			; $007C
	JR Addr_0073		; $007E



Addr_0080:
	LD A,$91		; $0080
	LD ($FF00+40),A		; $0082  Turn on LCD, showing Background
	LD HL,$C000		; $0084  Send data at C000-C050 (see $0025)
	LD C,$00		; $0087
Addr_0089:
	LD A,$00		; $0089  Pulse data line
	LD ($FF00+C),A		; $008B
	LD A,$30		; $008C  Raise data line
	LD ($FF00+C),A		; $008E
	LD B,$10		; $008F  Send one packet of 16 bytes
Addr_0091:
	LD E,$08		; $0091  8 bytes per bit
	LD A,(HL+)		; $0093  Get byte to send
	LD D,A			; $0094
Addr_0095:
	BIT 0,D			; $0095  Test if bit to send is 1 or 0
	LD A,$10		; $0097  Set to 1
	JR NZ, Addr_009D	; $0099  Jump if 1
	LD A,$20		; $009B  Else, Set to 0
Addr_009D:
	LD ($FF00+C),A		; $009D  Send bit
	LD A,$30		; $009E
	LD ($FF00+C),A		; $00A0  Raise
	RR D			; $00A1
	DEC E			; $00A3
	JR NZ, Addr_0095	; $00A4  Next bit
	DEC B			; $00A6
	JR NZ, Addr_0091	; $00A7  Next packet
	LD A,$20		; $00A9
	LD ($FF00+C),A		; $00AB
	LD A,$30		; $00AC
	LD ($FF00+C),A		; $00AE
	CALL Addr_00C2		; $00AF  Wait a little (delay)
	LD A,L			; $00B2
	CP $60			; $00B3
	JR NZ, Addr_0089	; $00B5

	LD C,$13		; $00B7  Reset sound chanel
	LD A,$C1		; $00B9
	LD ($FF00+C),A		; $00BB
	INC C			; $00BC
	LD A,$07		; $00BD
	LD ($FF00+C),A		; $00BF
	JR Addr_00FC		; $00C0

Addr_00C2:
	LD D,$04		; $00C2
Addr_00C4:
	LD A,($FF00+$44)	; $00C4  wait for screen frame
	CP $90			; $00C6
	JR NZ, Addr_00C4	; $00C8
	LD E,$00		; $00CA
Addr_00CC:
	DEC E			; $00CC
	JR NZ, Addr_00CC	; $00CD  Loop previous instruction 256 times
	DEC D			; $00CF
	JR NZ, Addr_00C4	; $00D0  Repeat for 4 times
	RET  			; $00D2

	; ==== Graphic routine ====

Addr_00D3:
	LD C,A			; $00D3  "Double up" all the bits of the graphics data
Addr_00D4:
	LD B,$04		; $00D4     and store in Video RAM
Addr_00D6:
	PUSH BC			; $00D6
	RL C			; $00D7
	RLA  			; $00D9
	POP BC			; $00DA
	RL C			; $00DB
	RLA  			; $00DD
	DEC B			; $00DE
	JR NZ, Addr_00D6	; $00DF
	LD (HL+),A		; $00E1
	INC HL			; $00E2
	LD (HL+),A		; $00E3
	INC HL			; $00E4
	RET  			; $00E5

Addr_00E6:
	; (R) sign
	.DB $3C,$42,$B9,$A5,$B9,$A5,$42,$3C

Addr_00EE:
	; Unused space
	.DB $00 $00 $00 $00 $00 $00 $00 $00 $00 $00 $00 $00 $00 $00

Addr_00FC:
	LD A,$01		;00FC
	LD (FF00+50),A		;00FE  turn off internal ROM