User:Dr. Floppy/Apex

Apex is a side-scrolling adventure/exploration game. It serves as a testament to the "golden age" of console gaming (circa early '90's)- a celebration of what was, what is and what might have been.

Overview

• Project owner: Dr. Floppy
• Developer: 2nd Party
• Compiler: None (hex coding)
• Sound driver: None (original engine)
• Soundtrack by: Dr. Floppy
• Started on: 5/2011
• Status: Preproduction
• Mapper: MMC5 (ETROM)
• PRG-ROM: 256 KB
• CHR-ROM: 256 KB
• PRG-RAM: 64 KB

Story

Bioterrorists are cultivating superviruses in labs hidden at the bottom of the ocean.

Gameplay

Apex is a rather nondescript purple angelfish with two basic attacks: a stationary somersault and high-velocity bubble projectiles.

RAM Map

$00-0F: Music channel pointers
$10-1F: Repeat coda pointers
$20-2F: Cycle countdowns & reiterations
$30-3F: Timbre/volume/misc.
$C0: Current Spritesheet
$C1: Current BG Tilesheet
$C4: SPR-OAM Transfer on next NMI? (#00 = yes)
$FC: Frame Counter

$100-1FF: Stack

$200-2FF: Sprites

ROM Map

$3E010: NMI Routine
$3F010: Init. Routine
$3F090: Title Screen draw routine
$3F0F0-3F10F: Title Screen palettes
$3F110: Main Program Loop
$40000: Waiting for NMI