Extremely barebones Mega Drive application that causes a 68000 memory address error exception and… does literally nothing else. (Yes, I wrote this solely just to help reproduce an emulator crash.)

MegaDriveMemoryAccessErrorExceptionTester.asm

; Mega Drive Memory Access Error Exception Tester
; Karen/あけみ (akemin_dayo)

; Extremely barebones Mega Drive application that causes a 68000 memory address error exception and… does literally nothing else.
; (Yes, I wrote this solely just to help reproduce an emulator crash.)

; Build instructions:
; asm68k /p MegaDriveMemoryAccessErrorExceptionTester.asm,MegaDriveMemoryAccessErrorExceptionTester.md

ROMstart:
; 68000 CPU vector table
	dc.l 0x00FFE000			; Initial stack pointer value
	dc.l main				; Start of program
	dc.l stub				; Bus error
	dc.l stub				; Address error (4)
	dc.l stub				; Illegal instruction
	dc.l stub				; Division by zero
	dc.l stub				; CHK exception
	dc.l stub				; TRAPV exception (8)
	dc.l stub				; Privilege violation
	dc.l stub				; TRACE exception
	dc.l stub				; Line-A emulator
	dc.l stub				; Line-F emulator (12)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved) (16)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved) (20)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved) (24)
	dc.l stub				; Spurious exception
	dc.l stub				; IRQ level 1
	dc.l stub				; IRQ level 2
	dc.l stub				; IRQ level 3 (28)
	dc.l stub				; IRQ level 4 (horizontal retrace interrupt)
	dc.l stub				; IRQ level 5
	dc.l stub				; IRQ level 6 (vertical retrace interrupt)
	dc.l stub				; IRQ level 7 (32)
	dc.l stub				; TRAP #00 exception
	dc.l stub				; TRAP #01 exception
	dc.l stub				; TRAP #02 exception
	dc.l stub				; TRAP #03 exception (36)
	dc.l stub				; TRAP #04 exception
	dc.l stub				; TRAP #05 exception
	dc.l stub				; TRAP #06 exception
	dc.l stub				; TRAP #07 exception (40)
	dc.l stub				; TRAP #08 exception
	dc.l stub				; TRAP #09 exception
	dc.l stub				; TRAP #10 exception
	dc.l stub				; TRAP #11 exception (44)
	dc.l stub				; TRAP #12 exception
	dc.l stub				; TRAP #13 exception
	dc.l stub				; TRAP #14 exception
	dc.l stub				; TRAP #15 exception (48)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)
	dc.l stub				; Unused (reserved)

; Mega Drive ROM header
	dc.b "SEGA MEGA DRIVE "                                 ; [0x100, 16 bytes] System type
	dc.b "(C)akemin_dayo  "                                 ; [0x110, 16 bytes] Copyright
	dc.b "Mega Drive Memory Access Error Exception Tester " ; [0x120, 48 bytes] Domestic title
	dc.b "Mega Drive Memory Access Error Exception Tester " ; [0x150, 48 bytes] Overseas title
	dc.b "GM AKM-7373-00"                                   ; [0x180, 14 bytes] Serial number
	dc.w 0x7373                                             ; [0x18E, 2 bytes] Checksum
	dc.b "J               "                                 ; [0x190, 16 bytes] I/O support
	dc.l ROMstart, ROMend - 1                               ; [0x1A0, 8 bytes] ROM address range
	dc.l 0x00FF0000, 0x00FFFFFF                             ; [0x1A8, 8 bytes] RAM address range
	dc.b "  ", 0x00, 0x00                                   ; [0x1B0, 4 bytes] SRAM/EEPROM type
	dc.l 0x00000000, 0x00000000                             ; [0x1B4, 8 bytes] SRAM/EEPROM address range
	dc.b "            "                                     ; [0x1BC, 12 bytes] Modem support
	dc.b "                                        "         ; [0x1C8, 40 bytes] Memo/Notes (Unused)
	dc.b "JUE"                                              ; [0x1F0, 3 bytes] Region
	dc.b "             "                                    ; [0x1F3, 13 bytes] Unused

main:
	; The 68000 CPU can only access words (or long words) at even memory addresses.
	; So, to purposefully cause a memory address error exception to occur, we can just simply attempt to read a word from an odd memory address.
	move.w 0x00000001, d0

stub:
	; Stub out all interrupts.
	rte

ROMend: