Issues with similar ROM files.

[DNA64]

heads/main-0-g52c6150-dirty remotes/origin/nintendogw-main2-0-g635d7421

ROM 1

ROM: Rad Racer 2 (USA).nes CRC32: 801836A4 Issue: BSOD
Size: 64k PRG / 64k CHR Mirroring: H Mapper: MMC3 (iNES 004)

Describe the bug At first glance the game appears to work. However, after pressing start, and selecting a stage, as soon as you press the Game button you'll see the BSOD. This can actually result in a system that doesn't respond to button pushes, meaning you have to disconnect the battery. Though thankfully, this level of a crash only happened to me once and I wasn't able to reproduce it, so it should be rare.

To Reproduce Steps to reproduce the behavior:

1. Start new game
2. Press start Game
3. Press start again .
4. See error

Expected behavior Not a BSOD.

ROM 2

ROM: Family Tennis (Japan).nes CRC32: E80B8D07 Issue: Major Graphical Issues Size: 64k PRG / 64k CHR Mirroring: V Mapper: MMC3 (iNES 004)

Describe the bug Mapper/Sprite Errors?

To Reproduce Steps to reproduce the behavior:

1. Start new game
2. Wait for demo to start (Or press start and play)
3. See error

Expected behavior Full Tennis Court view, no garbage on screen.

ROM 3

ROM: Family Boxing (Japan).nes CRC32: 02140A08 Issue: Major Graphical Issues Size: 64k PRG / 64k CHR Mirroring: V Mapper: MMC3 (iNES 004)

Describe the bug Mapper/Sprite Errors? Black Screen/Missing Sprites.

To Reproduce Steps to reproduce the behavior:

1. Start new game.
2. See the error

Expected behavior Graphics are usually nice to have ;)

[kbeckmann]

Investigated ROM: Rad Racer 2 (USA).nes. The problem is that the emulator has a bug where it is writing to the ROM. I don't know enough about how the emulator works to properly fix it (but could work around it)

[kbeckmann]

The emulator doesn't handle Family Tennis (Japan).nes well. Can reproduce in Linux, not a porting issue.