Program compatibility

This page describes defects in homebrew games. For defects in commercial games, see Game Bugs.

Many older programs that are passed off as NES programs were tested exclusively with older, less accurate emulators, and do not work on a Nintendo Entertainment System.

Compatible Programs

See also: Projects

• BoxBoy
• Hot Seat Harry
• Munchie Attack

As the PowerPak became more widespread, it became easier for programmers to test a daily build on an NES. Games developed in the PowerPak era include

• LJ65

Almost Compatible Programs

Title	Problem Description	Screenshots
Years Behind	Scrolltext glitches, caused by slight inaccuracies in compensation for APU DMC DMA cycle stealing. Color glitches caused by mid-frame palette rewriting. [1]
Final Fantasy II (English translation, Neo Demiforce)	Version 1.02 and 1.03 — graphic glitches during intro, no text during prologue (blue screen without text). Caused by incorrect setting of nametables in PPUCTRL, misuse of PPUSCROLL, and reading of PPUSTATUS to detect VBLANK. [2]

Incompatible Programs

• Dikki Painguin in: TKO for the Third Reich
• Mouser
• RTC Demo
• Sack of Flour, Heart of gold