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RetroBIOS

RetroDream

RetroDream emulates Sega Dreamcast. It reads 2 files, none of them required: it starts games without them.

About this profile
Detail Value
Type libretro
Classification Community fork
Source https://github.com/libretro/redream-next
Upstream https://github.com/inolen/redream
Version 0.0, stated in src/host/retro_host.c
Revision libretro/redream-next@d826ece7f987
Profiled 2026-03-25
Profile YAML, JSON
Cores retrodream
Systems Sega Dreamcast
Install this emulator's files

The installer finds your setup and its BIOS folder, then downloads only the files this emulator reads there and checks each one.

Open the Start menu. Type PowerShell and open it. Paste the line. Press Enter.

PowerShell
&([scriptblock]::Create((irm https://abdess.github.io/retrobios/i.ps1))) --emulator retrodream
Technical notes

Fork of the last GPLv3 release of redream (inolen) before it went closed-source. The core has HLE bootstrap -- when boot.bin is missing, bios_invalid_instr() traps at PC=0x0 and calls bios_boot(), which loads IP.BIN and 1ST_READ.BIN directly from disc, sets up syscall vectors, and starts execution at 0xac008300.

The fork sets appdir to the RetroArch system directory root (retro_host.c:216-217), unlike the upstream which appends /dc (upstream retro_host.c:196-198). The .info declares dc/ prefix paths, the layout the upstream reads.

boot.bin is validated against four known MD5 hashes (boot.c:25-30). Validation failure logs a warning but the core continues via HLE.

flash.bin is read/write. If missing, bios_validate_flash() resets all partitions to defaults. Saved back to disk on shutdown (flash.c:197-199).

Files

Section titled “Files”

2 files: 0 required, 2 optional. 1 has an HLE fallback.

In this collection: 2 in repo and 0 missing.

Optional

Section titled “Optional”

boot.bin optional in repo HLE fallback

  • System: Sega Dreamcast
  • Dreamcast boot ROM. Four known variants accepted.
Hashes, validation and source
  • MD5: a5c6a00818f97c5e3e91569ee22416dc, 37c921eb47532cae8fb70e5d987ce91c, f2cd29d09f3e29984bcea22ab2e006fe, e10c53c2f8b90bab96ead2d368858623
  • Validation: size, md5
  • Asked for by: emulator code, libretro port
  • Source: src/guest/rom/boot.c:12-80 (emulator code, libretro port)

flash.bin optional in repo

  • System: Sega Dreamcast
  • Dreamcast flash memory. Written back on shutdown.
Validation and source

Next steps

Section titled “Next steps”
.

Maintained by Abdess on GitHub. Report a problem.

Packs from release v2026.10.10, .

MIT for the tooling and metadata. BIOS and firmware files are third-party system software, preserved for personal backup, archival and interoperability.