MBGS - Toejam and Earl

- Summary

Current State: Active

Last updated: 29-Jun-2020

ROM File: Toejam & Earl (REV 00) (U) [!].bin

My favourite game on my favourite console!

This is just a tiny snippet of the information I've discovered for this game! Enough to have a little fun, but nothing in comparision to what is available in my dedicated Toejam and Earl Disassembly project.

- ROM (1MB, approx 4.62% deciphered as at 11-Apr-2019)

Key: Game Dynamics Data Block Graphics General Routine Error Handling ROM Header Empty Space

+/-

Offset

Length (hex)

Opcode / Hexcode

Instruction / ASCII

Description

+

00000-001FF

00000-00007
				00008-0000F
				00010-00017
				00018-0001F
				00020-00027
				00028-0002F
				00030-00037
				00038-0003F
				00040-00047
				00048-0004F
				00050-00057
				00058-0005F
				00060-00067
				00068-0006F
				00070-00077
				00078-0007F
				00080-00087
				00088-0008F
				00090-00097
				00098-0009F
				000A0-000A7
				000A8-000AF
				000B0-000B7
				000B8-000BF
				000C0-000C7
				000C8-000CF
				000D0-000D7
				000D8-000DF
				000E0-000E7
				000E8-000EF
				000F0-000F7
				000F8-000FF
				00100-00107
				00108-0010F
				00110-00117
				00118-0011F
				00120-00127
				00128-0012F
				00130-00137
				00138-0013F
				00140-00147
				00148-0014F
				00150-00157
				00158-0015F
				00160-00167
				00168-0016F
				00170-00177
				00178-0017F
				00180-00187
				00188-0018F
				00190-00197
				00198-0019F
				001A0-001A7
				001A8-001AF
				001B0-001B7
				001B8-001BF
				001C0-001C7
				001C8-001CF
				001D0-001D7
				001D8-001DF
				001E0-001E7
				001E8-001EF
				001F0-001F7
				001F8-001FF

00FF 8000 0000 ...

00FF 8000 0000 0202
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 033E 0000 0200
				0000 032E 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				0000 0200 0000 0200
				5345 4741 2047 454E
				4553 4953 2020 2020
				2843 2953 4547 4120
				3139 3931 2E4A 554C
				544F 454A 414D 2026
				2045 4152 4C20 2020
				2020 2020 2020 2020
				2020 2020 2020 2020
				2020 2020 2020 2020
				2020 2020 2020 2020
				544F 454A 414D 2026
				2045 4152 4C20 2020
				2020 2020 2020 2020
				2020 2020 2020 2020
				2020 2020 2020 2020
				2020 2020 2020 2020
				474D 204D 4B2D 3130
				3230 202D 3030 E88B
				4A20 2020 2020 2020
				2020 2020 2020 2020
				0000 0000 000F FFFF
				00FF 0000 00FF FFFF
				2020 2020 2020 2020
				2020 2020 2020 2020
				2020 2020 2020 2020
				2020 2020 2020 2020
				2020 2020 2020 2020
				2020 2020 2020 2020
				2020 2020 2020 2020
				2020 2020 2020 2020
				5520 2020 2020 2020
				2020 2020 2020 2020

.ÿ€.....

.ÿ€.....
				........
				........
				........
				........
				........
				........
				........
				........
				........
				........
				........
				........
				........
				...>....
				........
				........
				........
				........
				........
				........
				........
				........
				........
				........
				........
				........
				........
				........
				........
				........
				........
				SEGA GEN
				ESIS    
				(C)SEGA 
				1991.JUL
				TOEJAM &
				EARL   
						
						
						
						
				TOEJAM &
				EARL   
						
						
						
						
				GM MK-10
				20 -00è‹
				J       
						
				......ÿÿ
				.ÿ...ÿÿÿ
						
						
						
						
						
						
						
						
				U

Standard rom header with the following details:
					Initial stack pointer value: 00FF 8000
					Entry Point: 0000 0202
					ROM Details: SEGA GENESIS    (C)SEGA 1991.JULTOEJAM & EARL TOEJAM & EARL GM MK-1020 -00

+

00200-00201

00200-00201

60FE

60FE

BRA       $00000200

BRA       $00000200

1 line infinite loop, used for exceptions.

+

00202-0028F

00202-00207
				00208-00209
				0020A-0020F
				00210-00211
				00212-00215
				00216-00219
				0021A-0021D
				0021E-00221
				00222-00225
				00226-00227
				00228-0022F
				00230-00231
				00232-00233
				00234-00235
				00236-00237
				00238-00239
				0023A-0023B
				0023C-0023D
				0023E-0023F
				00240-00243
				00244-00245
				00246-00247
				00248-00249
				0024A-0024B
				0024C-0024D
				0024E-0024F
				00250-00251
				00252-00253
				00254-00257
				00258-00259
				0025A-0025B
				0025C-0025D
				0025E-0025F
				00260-00263
				00264-00265
				00266-00267
				00268-00269
				0026A-0026B
				0026C-0026F
				00270-00271
				00272-00273
				00274-00275
				00276-00279
				0027A-0027B
				0027C-0027F
				00280-00283
				00284-00285
				00286-00289
				0028A-0028D
				0028E-0028F

8E

4AB9 00A10008 ...

4AB9 00A10008
				6606
				4A79 00A1000C
				667C
				4BFA 007C
				4C9D 00E0
				4CDD 1F00
				1029 EF01
				0200 000F
				6708
				237C 53454741 2F00
				3014
				7000
				2C40
				4E66
				7217
				1A1D
				3885
				DA47
				51C9 FFF8
				289D
				3680
				3287
				3487
				0111
				66FC
				7425
				10DD
				51CA FFFC
				3480
				3280
				3487
				2D00
				51CE FFFC
				289D
				289D
				761F
				2680
				51CB FFFC
				289D
				7813
				2680
				51CC FFFC
				7A03
				175D 0011
				51CD FFFA
				3480
				4CD6 7FFF
				46FC 2700
				606C

TST.L     $00A10008 ...

TST.L     $00A10008
				BNE       $00000210
				TST.W     $00A1000C
				BNE       $0000028E
				LEA       $00000290(pc),A5
				MOVEM.W   (A5)+,D5-D7
				MOVEM.L   (A5)+,A0-A4
				MOVE.B    -$10FF(A1),D0
				AND.B     #$0F,D0
				BEQ       $00000230
				MOVE.L    #$53454741,$2F00(A1)
				MOVE.W    (A4),D0
				MOVEQ     #$00,D0
				MOVE.L    D0,A6
				MOVE      A6,USP
				MOVEQ     #$17,D1
				MOVE.B    (A5)+,D5
				MOVE.W    D5,(A4)
				ADD.W     D7,D5
				DBRA      D1,$0000023A
				MOVE.L    (A5)+,(A4)
				MOVE.W    D0,(A3)
				MOVE.W    D7,(A1)
				MOVE.W    D7,(A2)
				BTST      D0,(A1)
				BNE       $0000024C
				MOVEQ     #$25,D2
				MOVE.B    (A5)+,(A0)+
				DBRA      D2,$00000252
				MOVE.W    D0,(A2)
				MOVE.W    D0,(A1)
				MOVE.W    D7,(A2)
				MOVE.L    D0,-(A6)
				DBRA      D6,$0000025E
				MOVE.L    (A5)+,(A4)
				MOVE.L    (A5)+,(A4)
				MOVEQ     #$1F,D3
				MOVE.L    D0,(A3)
				DBRA      D3,$0000026A
				MOVE.L    (A5)+,(A4)
				MOVEQ     #$13,D4
				MOVE.L    D0,(A3)
				DBRA      D4,$00000274
				MOVEQ     #$03,D5
				MOVE.B    (A5)+,$0011(A3)
				DBRA      D5,$0000027C
				MOVE.W    D0,(A2)
				MOVEM.L   (A6),D0-D7/A0-A6
				MOVE      #$2700,SR
				BRA       $000002FC

Megadrive initialisation routine...

Megadrive initialisation routine.
				Check if we are doing a 'soft reset' if so skip the initialisation.
				
				Load setup values from 00000290.
				
				
				Check if we have to do the 'Sega Security Check'.
				Skip it.
				Write 'SEGA' to memory.
				Initialise the VDP.
				
				
				
				
				
				
				
				
				
				
				
				
				Initialise the Z80.
				
				
				
				
				
				
				
				Clear RAM
				
				
				
				
				Clear CRAM
				
				
				
				Clear VDP
				
				
				Initialise PSG (Sound Processor)
				
				
				
				
				Jump to the game initialisation.

+

00290-002FB

00290-00297
				00298-0029F
				002A0-002A7
				002A8-002AF
				002B0-002B7
				002B8-002BF
				002C0-002C7
				002C8-002CF
				002D0-002D7
				002D8-002DF
				002E0-002E7
				002E8-002EF
				002F0-002F7
				002F8-002FB

6C

8000 3FFF 0100 ...

8000 3FFF 0100 00A0
				0000 00A1 1100 00A1
				1200 00C0 0000 00C0
				0004 0414 303C 076C
				0000 0000 FF00 8137
				0001 0100 00FF FF00
				0080 4000 0080 AF01
				D91F 1127 0021 2600
				F977 EDB0 DDE1 FDE1
				ED47 ED4F D1E1 F108
				D9C1 D1E1 F1F9 F3ED
				5636 E9E9 8104 8F02
				C000 0000 4000 0010
				9FBF DFFF

N/A

N/A
				N/A
				N/A
				N/A
				N/A
				N/A
				N/A
				N/A
				N/A
				N/A
				N/A
				N/A
				N/A
				N/A

Setup values

+

002FC-00305

002FC-00301
				00302-00305

6
				4

4A79 00C00004 ...

4A79 00C00004
				4EBA 001E

TST.W     $00C00004 ...

TST.W     $00C00004
				JSR       $00000322(pc)

Game Entry Point.

+

00306-00321

00306-00307
				00308-0030D
				0030E-00311
				00312-00317
				00318-0031B
				0031C-00321

1C

4E71 ...

4E71
				207C 00FF0000
				303C 3FFF
				20FC 00000000
				51C8 FFF8
				4EB9 000003FE

NOP ...

NOP
				MOVE.L    #$00FF0000,A0
				MOVE.W    #$3FFF,D0
				MOVE.L    #$00000000,(A0)+
				DBRA      D0,$00000312
				JSR       $000003FE

Clear RAM Routine.

+

0BB78-0BC27

0BB78-0BB7D
				0BB7E-0BB7F
				0BB80-0BB81
				0BB82-0BB89
				0BB8A-0BB91
				0BB92-0BB95
				0BB96-0BB9D
				0BB9E-0BBA1
				0BBA2-0BBA3
				0BBA4-0BBAB
				0BBAC-0BBB3
				0BBB4-0BBB9
				0BBBA-0BBC1
				0BBC2-0BBC9
				0BBCA-0BBD1
				0BBD2-0BBD9
				0BBDA-0BBE1
				0BBE2-0BBE5
				0BBE6-0BBE7
				0BBE8-0BBEB
				0BBEC-0BBEF
				0BBF0-0BBF3
				0BBF4-0BBF7
				0BBF8-0BBF9
				0BBFA-0BBFD
				0BBFE-0BC01
				0BC02-0BC05
				0BC06-0BC07
				0BC08-0BC0B
				0BC0C-0BC0F
				0BC10-0BC13
				0BC14-0BC15
				0BC16-0BC19
				0BC1A-0BC1D
				0BC1E-0BC21
				0BC22-0BC25
				0BC26-0BC28

AB

207C 00FFA248 ...

207C 00FFA248
				4A10
				6D1C
				13FC 0001 00FFA2A6
				13FC 0017 00FFA252
				10BC 0003
				13FC 0003 00FFA24A
				4A28 0001
				6D1E
				13FC 0001 00FFA326
				13FC 001F 00FFA253
				117C 0003 0001
				13FC 0003 00FFA24B
				13FC 00FF 00FFA259
				13FC 00FF 00FFA258
				13FC 00FF 00FFDE50
				13FC 00FF 00FFDE51
				4878 0001
				42A7
				4EBA F2AE
				4878 0001
				4878 0001
				4EBA F2A2
				42A7
				4EBA EE3E
				4878 0001
				4EBA EE36
				42A7
				4EBA F0A0
				4878 0001
				4EBA F098
				42A7
				4EBA F7AC
				4878 0001
				4EBA F7A4
				4FEF 0028
				4E75

MOVE.L    #$00FFA248,A0 ...

MOVE.L    #$00FFA248,A0
				TST.B     (A0)
				BLT       $0000BB9E
				MOVE.B    #$01,$00FFA2A6
				MOVE.B    #$17,$00FFA252
				MOVE.B    #$03,(A0)
				MOVE.B    #$03,$00FFA24A
				TST.B     $0001(A0)
				BLT       $0000BBC2
				MOVE.B    #$01,$00FFA326
				MOVE.B    #$1F,$00FFA253
				MOVE.B    #$03,$0001(A0)
				MOVE.B    #$03,$00FFA24B
				MOVE.B    #$FF,$00FFA259
				MOVE.B    #$FF,$00FFA258
				MOVE.B    #$FF,$00FFDE50
				MOVE.B    #$FF,$00FFDE51
				PEA       $0001
				CLR.L     -(A7)
				JSR       $0000AE98(pc)
				PEA       $0001
				PEA       $0001
				JSR       $0000AE98(pc)
				CLR.L     -(A7)
				JSR       $0000AA3A(pc)
				PEA       $0001
				JSR       $0000AA3A(pc)
				CLR.L     -(A7)
				JSR       $0000ACAA(pc)
				PEA       $0001
				JSR       $0000ACAA(pc)
				CLR.L     -(A7)
				JSR       $0000B3C4(pc)
				PEA       $0001
				JSR       $0000B3C4(pc)
				LEA       $0028(A7),A7
				RTS

Sets Toejam and Earl's Starting Stats...

Sets Toejam and Earl's Starting Stats.
				Checks if Toejam is in the game.
				Branch if he isn't.
				
				Sets Toejam's health to 17 (23 dec).
				Sets Toejam's lives to 3.
				Sets Toejam's cash to 3.
				Checks if Earl is in the game
				Branch if he isn't.
				
				Sets Earl's health to 1F (31 dec).
				Sets Earl's lives to 3.
				Sets Earl's cash to 3.

+

2C52C-2E72B

2C52C-2E72B

21FF

21FF

N/A

N/A

N/A

N/A

Graphics

+

FFDE7-FFFFF

FFDE7-FFDEE
				FFDEF-FFDF6
				FFDF7-FFDFE
				FFDFF-FFE06
				FFE07-FFE0E
				FFE0F-FFE16
				FFE17-FFE1E
				FFE1F-FFE26
				FFE27-FFE2E
				FFE2F-FFE36
				FFE37-FFE3E
				FFE3F-FFE46
				FFE47-FFE4E
				FFE4F-FFE56
				FFE57-FFE5E
				FFE5F-FFE66
				FFE67-FFE6E
				FFE6F-FFE76
				FFE77-FFE7E
				FFE7F-FFE86
				FFE87-FFE8E
				FFE8F-FFE96
				FFE97-FFE9E
				FFE9F-FFEA6
				FFEA7-FFEAE
				FFEAF-FFEB6
				FFEB7-FFEBE
				FFEBF-FFEC6
				FFEC7-FFECE
				FFECF-FFED6
				FFED7-FFEDE
				FFEDF-FFEE6
				FFEE7-FFEEE
				FFEEF-FFEF6
				FFEF7-FFEFE
				FFEFF-FFF06
				FFF07-FFF0E
				FFF0F-FFF16
				FFF17-FFF1E
				FFF1F-FFF26
				FFF27-FFF2E
				FFF2F-FFF36
				FFF37-FFF3E
				FFF3F-FFF46
				FFF47-FFF4E
				FFF4F-FFF56
				FFF57-FFF5E
				FFF5F-FFF66
				FFF67-FFF6E
				FFF6F-FFF76
				FFF77-FFF7E
				FFF7F-FFF86
				FFF87-FFF8E
				FFF8F-FFF96
				FFF97-FFF9E
				FFF9F-FFFA6
				FFFA7-FFFAE
				FFFAF-FFFB6
				FFFB7-FFFBE
				FFFBF-FFFC6
				FFFC7-FFFCE
				FFFCF-FFFD6
				FFFD7-FFFDE
				FFFDF-FFFE6
				FFFE7-FFFEE
				FFFEF-FFFF6
				FFFF7-FFFFE
				FFFFF-FFFFF

FFFF FFFF FFFF ...

FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FFFF FFFF FFFF FFFF
				FF

N/A

N/A
				N/A
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				N/A
				N/A

Empty space

- RAM (64KB, approx 1.00% deciphered as at 11-Apr-2019)

Key: Game Dynamics General Routine Unused

RAM Offset	Length (hex)	Original Value	Useful Values	Description
A248	1	03	00-09	Toejam's lives.
A249	1	03	00-09	Earl's lives.
A24A	1	Unknown	00-??	Toejam's cash.
A24B	1	Unknown	00-??	Earl's cash.
A24C-A24D	2	0000	0000-????	Toejam's score.
A24E-A24F	2	0000	0000-????	Earl's score.
A250	1	00	00-09	Toejam's promotion level. (See note 1)
A251	1	00	00-09	Earl's promotion level. (See note 1)
A298-A29B	4	Unknown	??-??	Toejam's health.
A29C-A29F	4	Unknown	??-??	Earl's health.
DA8A-DAC1	37	00	00-01	Stores whether presents are identified or not. (See note 3)
DAC2-DAE1	1F	1B or FF	00-1B	Stores Toejam and Earl's inventory. (See note 2)
DAE2-DAF1	10	Mixed	Unknown	Present 1 data.

Note 1:

00 = Wiener	05 = Bro
01 = Dufus	06 = Homey
02 = Poindexter	07 = Rapmaster
03 = Peanut	08 = Funk Lord
04 = Dude	09 = Goner

Note 2:

00 = Icarus Wings	0A = Rootbeer	14= Extra Buck
01 = Spring Shoes	0B = Promotion	15 = Jackpot
02 = Innertube	0C = Un-fall (Togetherness in 2 player)	16 = Tomato Rain
03 = Tomatoes	0D = Rain Cloud	17 = Earthling
04 = Sling Shot	0E = Fudge Sundae	18 = School Book
05 = Rocket Skates	0F = Decoy	19 = BoomBox
06 = Rose Bushes	10 = Total Bummer	1A = Random
07 = Super Hitops	11 = Extra Life	1B = Bonus Hi Tops
08 = Doorway	12 = Randomizer	FF = Empty
09 = Food	13 = Telephone

Note 3:

These come it pairs with the value in the even offsets representing the present and the value in the following odd offset representing if it is identified or not. 00 means it's not, 01 means it is.

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