[M1] Hack to make Missile doors require 1 instead of 5?

[ShadowOne333]

I was just wondering if there is a quick Hex edit to the ROM which makes missile doors open up with only 1 missile instead of the obligatory 5 missiles.
I want to make that change for a frankenstein hack of mine and that's the only thing I'm missing right now.

Thanks in advance to anyone willing to help out with this!

[snarfblam]

In each area bank, there is a table at $8BD1 that defines the number of shots required to open each type of door. (For example, pull up the Brinstar disassembly and search for "LB8D1:".)

Code Select Expand

L8BD1:  .byte $05, $01, $0A, $01

That's five for a red door, one for a blue door, ten for a purple/orange door, and one for the door to mother brain's room (also blue).

In the ROM, these tables would be found at, respectively for Brinstar, Norfair, Tourian, Kraid, and Ridley:

• $4BE1
• $8BE1
• $CBE1
• $10BE1
• $14BE1

[ShadowOne333]

[Thank you, snarfblam!
I was able to successfully make the changes I wanted to do to the hack :)

I went to all the tables and changed [05 01 0A 01] to [01 01 05 01], effectively changing all Red doors to open up with just one missile, and making the Purple/Orange door open up with 5 now.

Thank you so much for the help!