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After Burner III (Sega CD)

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Title Screen

After Burner III

Developer: CRI
Publishers: CRI (JP), Sega (US/EU)
Platform: Sega CD
Released in JP: December 18, 1992[1]
Released in US: 1993
Released in EU: 1993


DebugIcon.png This game has debugging material.
LevelSelectIcon.png This game has a hidden level select.


Hmmm...
To do:
Regional Differences.

Debug Options

Japan International
DEBUG OPTIONS - VIEW MODE - ENEMY MISSILE HIT CHECK - ENEMY VULCAN HIT CHECK - FIRE ENEMY MISSILE - FIRE ENEMY VULCAN - START STAGE - PAD2 SPECIAL FUNCTION - SAVE PAD DATA FOR DEMO - ROLLING MODE - EXIT DEBUG OPTIONS - 6B PAD MODE BUTTON - ENEMY MISSILE HIT CHECK - ENEMY VULCAN HIT CHECK - FIRE ENEMY MISSILE - FIRE ENEMY VULCAN - START STAGE - PAD2 SPECIAL FUNCTION - SAVE PAD DATA FOR DEMO - EXIT

A debug menu, which differs slightly between versions, can be found on file mdl01_m.bin. This file is loaded into the Main CPU RAM at offset 0xff0000.

Each title screen menu has an associated subroutine, including the debug menu (addresses taken from the Japanese version):

00ff003e 4e bb 00 04     jsr        (0xff0044,PC,D0w*0x1)
00ff0042 4e 75           rts
00ff0044 60 00 00 c6     bra.w      LAB_00ff010c
00ff0048 60 00 05 88     bra.w      LAB_00ff05d2
00ff004c 60 00 09 5e     bra.w      LAB_00ff09ac
00ff0050 60 00 14 de     bra.w      LAB_00ff1530
00ff0054 60 00 13 60     bra.w      LAB_00ff13b6
00ff0058 60 00 07 84     bra.w      LAB_00ff07de
00ff005c 60 00 16 48     bra.w      LAB_00ff16a6 ; debug options
00ff0060 60 00 1b 06     bra.w      LAB_00ff1b68

The subroutine index for the title screen options menu is set at 0xff079c:

00ff079c 11 fc 00        move.b     #0x8,(DAT_fffff703).w
         08 f7 03
00ff07a2 4e 75           rts

We can replace that index with value 0x18 to load the debug menu, by applying to the CD's data track one of the following patches:

Japan International
81adf = 18 82409 = 18
(Source: Original TCRF research)