Demul Mpr- 21931. Ic501 🚀

If you have a BIOS file named 1_01d_01.bin , it is actually the same file as mpr-21931.ic501 . You can simply rename it and add it to your dc.zip archive to satisfy the emulator's requirements.

(standalone or RetroArch core). Flycast has better NAOMI compatibility and more accurate video output than Demul (which hasn’t been updated since 2015). demul mpr- 21931. ic501

The most likely cause is that you are using an outdated or corrupted dc.zip file. Ensure that your BIOS set is up-to-date; the MAME project regularly updates the Dreamcast BIOS sets. Demul relies on the same ROM management structure as MAME, so a newer, non-merged MAME set will contain the correct files. If you have a BIOS file named 1_01d_01

| Demul Symptom | Likely Real Cause | IC501 Connection | |---------------|-------------------|------------------| | "No signal" after booting a NAOMI game | Incorrect plugin (gpuDX11g.dll vs gpuDXLegacy.dll) | Not related | | Scrambled, rainbow-colored image | Wrong cable type (VGA vs 15kHz) in Demul settings | Demul might be emulating a different sync type | | Missing sprites but background OK | PowerVR2 emulation bug | Not hardware DAC related | | Entire screen is solid green/red/blue | Corrupted ROM or incorrect region settings | Emulates a stuck color channel (DAC emulation quirk) | Flycast has better NAOMI compatibility and more accurate