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ROM Address Length Type Description Details
$01A83B 778 bytes Sprite subroutine (JSR) Default sprite interaction routine. The sprite interaction routine calls it if $167A,x is positive/ bit 7 is not set.
- $01A852 controls number where the star chain should stop. To be used with $01A856
- $01A856 controls, how many points/ one-ups are added if the max limit of a star chain is reached. To be used with $01A852

$01A8D0 handles the code when you jump on a spiky enemy.
Change $01A8D3 to $AD (LDA $xxxx) to disable spin jumping on spiky enemies. On contrary, change $01A8D3 to $80,$01 (BRA $01) to disable jumping with Yoshi on spiky enemies. To disable both, change $01A8D0 to $80,$04 (BRA $04).

$01A91C handles the code when you jump on a non-spiky enemy.
Change $01A91F to $AD (LDA $xxxx) to make spin jumps count as normal jumps. On contrary, change $01A91F to $80,$01 (BRA $01) to make jumps with Yoshi on enemies count as regular jumps. To make both count as regular jumps, change $01A91C to $80,$04 (BRA $04).

Change $01A930 to $00 to enable the boost gain with spin jump kill.
$01A940 is the sound effect to play when you kill an enemy with a spin jump/ jump with Yoshi.

$01AA42 is the routine for carryable sprites.
Change $01AA61 to $AD (LDA $xxxx) to enable carrying more than one sprite at time even though you already have one.
$01AB0D 1 byte Timer Time it takes for POW to disappear after jumping on it. Change to 00 to keep the POW after jumping on it.
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