Shippu Mahou Daisakusen/Reverse engineering notes - Revision history

Sylvie: Moved tables of values to the Racing subpage, just leaving the RE details here

2026-04-03T14:18:46Z

Moved tables of values to the Racing subpage, just leaving the RE details here

Sylvie: Some more address info, new section about speed and boosting values/mechanics

2026-04-02T21:08:45Z

Some more address info, new section about speed and boosting values/mechanics

Kitaru at 03:42, 2 April 2026

2026-04-02T03:42:15Z

Kitaru: Initial draft

2026-04-02T03:40:48Z

Initial draft

New page

TODO: clean up addresses below pointing directly to bytes when code is operating on them as words. e.g., P1 lives @ 100555.b is probably referenced in the code as 100554.w

1006C6 - seems to consistently hold boss HP value when one is on screen
1006AA - base address of the boss enemy object

object+$04 - animation frame
object+$06 - animation related flags (sprite rotation, hit flash and/or palette?, etc.)
object+$08 - y-coord
object+$0A - x-coord
object+$1C - HP value for enemies. Damage value for projectiles/player, to apply against target enemy up to their specified durability cap
object+$36 - i-frames

Code @ 13D78 - damage calculation for durable enemies
Code @ 13F6A - damage calculation for zakos (uncapped)

100551 - current play state?
100553 - current play flags?
100555 - current P1 lives

10058C = current calculated rank
10058E = base rank for current stage
100590 = survival rank (resets on stage start or player death)
1006A4 = survival rank increment timer (does not reset on stage start)

102C4A + $44 (102C8E) = base scroll speed?
102C4A + $46 (102C90) =
102C4A + $22 (102c6c) = speedometer?

1012DA = P1 sub-weapon type
1012D8 = P1 sub-weapon power

1005B1 - current stage
1005B3 - current track
1005B5 - current loop (0 = first, 1 = second)

100656 - table of P1 track times
10066E - table of track selections

@@ Line 35: / Line 35: @@
 * 102C4A + $44 (102C8E) = maximum unboosted speed
 * 102C4A + $46 (102C90) = minimum unboosted speed
-* 102C4A + $22 (102c6c) = current speed
+* 102C4A + $22 (102C6C) = current speed
 * 1012DE = P1 main shot power
@@ Line 51: / Line 51: @@
 == Speed and Boost Mechanics ==
-(To be pared down and moved elsewhere later; some of this can probably go on the main page, or a racing-focused subpage)
+This section describes how the details in [[Shippu_Mahou_Daisakusen/Racing#Technical_details]] were found.
-These are the maximum and minimum unboosted speed values for each track (obtained by observing 102C8E and 102C90 while playing the game). Some short sections are omitted (for example, when the wave of water comes in Deeply Dungeon, max and min speed are both briefly set to 1024).
+Minimum and maximum speed values for each track can be confirmed by watching the addresses 102C8E (max) and 102C90 (min) while playing through the game.
-{| class="wikitable"
+For boost mechanics, the relevant routines are at 7AD6 and 174D0. The routine at 7AD6 reads from a table stored at 718C2, which contains the base boost speed values for each character and stage. The routine at 174D0 applies the main shot power bonus and the bomb count modifier, using tables stored at 17568 (shot power bonus) and 175AE (bomb count modifier).
-Boosting increases your speed beyond the unboosted maximum by '''up to 128 units''', regardless of stage. This means boosting has a more significant effect on slow stages. For example, on Strato Storm, boosting can only increase your speed by up to 110%, while in Outcast Castle, it can increase your speed by up to 150% (early on) or ~167% (worm section).
+Note: Routine 174D0 also seems to do some stuff related to subweapons (probably damage calculations?) and there's a big table of subweapon-related values at 1756E.

@@ Line 17: / Line 17: @@
 * 100553 - current play flags?
 * 100555 - current P1 lives
 * 10058C = current calculated rank
@@ Line 23: / Line 33: @@
 * 1006A4 = survival rank increment timer (does not reset on stage start)
-* 102C4A + $44 (102C8E) = base scroll speed?
+* 102C4A + $44 (102C8E) = maximum unboosted speed
-* 102C4A + $46 (102C90) =
+* 102C4A + $46 (102C90) = minimum unboosted speed
-* 102C4A + $22 (102c6c) = speedometer?
+* 102C4A + $22 (102c6c) = current speed
 * 1012DA = P1 sub-weapon type
 * 1012D8 = P1 sub-weapon power
@@ Line 36: / Line 48: @@
 * 100656 - table of P1 track times
 * 10066E - table of track selections

@@ Line 1: / Line 1: @@
 TODO: clean up addresses below pointing directly to bytes when code is operating on them as words. e.g., P1 lives @ 100555.b is probably referenced in the code as 100554.w
-C6 - seems to consistently hold boss HP value when one is on screen
+* 1006C6 - seems to consistently hold boss HP value when one is on screen
-AA - base address of the boss enemy object
+* 1006AA - base address of the boss enemy object
-object+$04 - animation frame
+* object+$04 - animation frame
-object+$06 - animation related flags (sprite rotation, hit flash and/or palette?, etc.)
+* object+$06 - animation related flags (sprite rotation, hit flash and/or palette?, etc.)
-object+$08 - y-coord
+* object+$08 - y-coord
-object+$0A - x-coord
+* object+$0A - x-coord
-object+$1C - HP value for enemies. Damage value for projectiles/player, to apply against target enemy up to their specified durability cap
+* object+$1C - HP value for enemies. Damage value for projectiles/player, to apply against target enemy up to their specified durability cap
-object+$36 - i-frames
+* object+$36 - i-frames
-Code @ 13D78 - damage calculation for durable enemies
+* Code @ 13D78 - damage calculation for durable enemies
-Code @ 13F6A - damage calculation for zakos (uncapped)
+* Code @ 13F6A - damage calculation for zakos (uncapped)
-- current play state?
+* 100551 - current play state?
-- current play flags?
+* 100553 - current play flags?
-- current P1 lives
+* 100555 - current P1 lives
-C = current calculated rank
+* 10058C = current calculated rank
-E = base rank for current stage
+* 10058E = base rank for current stage
-= survival rank (resets on stage start or player death)
+* 100590 = survival rank (resets on stage start or player death)
-A4 = survival rank increment timer (does not reset on stage start)
+* 1006A4 = survival rank increment timer (does not reset on stage start)
-C4A + $44 (102C8E) = base scroll speed?
+* 102C4A + $44 (102C8E) = base scroll speed?
-C4A + $46 (102C90) =
+* 102C4A + $46 (102C90) =
-C4A + $22 (102c6c) = speedometer?
+* 102C4A + $22 (102c6c) = speedometer?
-DA = P1 sub-weapon type
+* 1012DA = P1 sub-weapon type
-D8 = P1 sub-weapon power
+* 1012D8 = P1 sub-weapon power
-B1 - current stage
+* 1005B1 - current stage
-B3 - current track
+* 1005B3 - current track
-B5 - current loop (0 = first, 1 = second)
+* 1005B5 - current loop (0 = first, 1 = second)
-- table of P1 track times
+* 100656 - table of P1 track times
-E - table of track selections
+* 10066E - table of track selections