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TASEmulators / fceux

FCEUX, a NES Emulator
http://fceux.com
GNU General Public License v2.0
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Galaxian (NES ROM) does not work on FCEUX 2.6.6 #675

Closed BlackPaladin2022 closed 10 months ago

BlackPaladin2022 commented 10 months ago

For some reason, I cannot run the NES ROM version of Galaxian on FCEUX 2.6.6. (The FDS version of the ROM does work normally, however.) Whenever trying to load the game with the emulator, I would receive either a blank screen or the emulator itself would close itself. (The ROM will run effortlessly on both Mesen2 and Nestopia.)

  1. Run FCEUX
  2. File -> Open
  3. Load the Galaxian NES ROM

The game should run normally. Instead, the game will either display a blank screen or shut down on its own without warning.

The ROMs with the following hashes were used...

Database match: Galaxian (Japan) (Rev A) Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042) File SHA-1: C5194F07BB0960D12F6425FCA23BEB41982EDD71 File CRC32: FAB815BE ROM SHA-1: 0FE9120FD5ADC2790B0B9E8FADD136F9C66A709F ROM CRC32: 76A6A813

Database match: Galaxian (Japan) (Rev A) Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042) File SHA-1: B9DA18B3FB90F51CFB6277C651E935FD28D7212A File CRC32: A80DA263 ROM SHA-1: 0FE9120FD5ADC2790B0B9E8FADD136F9C66A709F ROM CRC32: 76A6A813

Database match: Galaxian (Japan) Database: No-Intro: Nintendo Entertainment System (v. 20210216-231042) File SHA-1: A2C837C589E0FADEA7626E0245914F1B0C7948FD File CRC32: C0B43EBF ROM SHA-1: 44BC6C4E8B3F6C635281B4C05382E8F316D8269E ROM CRC32: 84F61CD

This was executed on Windows 10, and the emulator used was the non-QT version of FCEUX.

negativeExponent commented 10 months ago

so, issue is that in iNESLoad, prg sizes are represented as 16K chunks, so when an 8K prg is loaded, in the case of Galaxian which only has 8K in exponential notation, when right-shifted by 14 makes it 0.

i've now pushed PR that fixes this issue.