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xm6pro68k - RetroBIOS
Type standalone
Classification Enhanced forks
Source https://mijet.eludevisibility.org/XM6%20Pro-68k/XM6%20Pro-68k.html
Upstream closed-source
Version 260726
Profiled 2026-08-10
Cores xm6pro68k, xm6pro, XM6PRO68K, XM6PRO68K-WINDOWS
Systems sharp-x68000
Based on XM6 v2.06 by PI.
Technical notes

Closed-source Windows fork of PI's XM6 v2.06 (README.txt:6) by M.I.J.E.T., distributed only from mijet.eludevisibility.org as three 7-Zip packages: the program, a mandatory DLL Package and an optional Web Package that adds signed update downloads. Version.txt in the build analysed here reads 260726. The first release, 120303, forked XM6 v2.05. XM6.exe is a 32-bit MFC application whose import directory names mfc90u.dll and MSVCR90.dll, so the Visual C++ 2008 runtime carried by the DLL Package, or the redistributable, must sit beside the executable for the process to start; a second non-Unicode build lives in MBCS/ and needs the same files duplicated there. ES-DE launches it through the XM6PRO68K and XM6PRO68K-WINDOWS find rules with the working directory set to the emulator folder, on Linux under Wine or Proton. RetroBat registers it as xm6pro (Program.cs:189, Installer.cs:151), runs XM6.exe from its own directory and rewrites XM6.ini before launch (Xm6pro.Generator.cs:22-79).

System files are resolved beside XM6.exe. XM6 v2.06 declares them in Filepath::SystemFile[] (vm/filepath.cpp:394-405) and Filepath::SysFile (vm/filepath.cpp:121-137) builds each path from SystemDir when one is set and from the executable's own directory otherwise. XM6 Pro-68k references all ten names, nine of them in one contiguous string block mirroring that table in reverse, and exposes no ROM directory setting, while README.txt:71-73 requires the DLL Package files to be extracted next to the executable rather than into a subdirectory. Loading goes through Fileio::Load and Fileio::Read (vm/fileio.cpp:35-51, 175-192), which succeed only when the file holds at least the requested byte count, so every size below is a floor: a longer file loads and its tail is ignored. The XM6 v2.06 sources cited throughout are readable in mixerjdp/XM6_Libretro, which preserves the vm/ layer.

Machine selection follows ROM presence. Memory::Init (vm/memory.cpp:171-196) loads the base SASI machine, then probes XVI, Compact and X68030 in that order and keeps the first that succeeds. Memory::LoadROM (vm/memory.cpp:236-372) pairs each machine with its ROMs: XVI and Compact need their IPL plus SCSIINROM.DAT, X68030 needs IPLROM30.DAT plus ROM30.DAT read at 0x20000 bytes instead of 0x2000, and the base machine needs no SCSI ROM. Internal SCSI is the interface built into the X68000 SUPER and later models, external SCSI is the CZ-6BS1 add-on board (Reference Manual.txt:1529-1536).

Two files diverge from XM6 v2.06. The base IPL ROM is compiled into the executable: "The program now includes an internal copy of the basic IPL ROM. It will still try to load IPL ROMs externally first" (Change Log.txt:125-126), and README.txt:23-25 tells users to leave IPLROM.DAT out because loading it only costs startup time. The hard CG ROM requirement was dropped (Change Log.txt:129), so a missing font ROM yields garbage glyphs instead of failing initialisation (README.txt:277-278).

Two menu tools synthesise replacements. Synthesize replacement CG-ROM builds CGROM.TMP from the installed MS Gothic and MS Mincho fonts and aborts when either is absent; README.txt:294-296 warns that different machines produce different files. Synthesize replacement SCSI ROMs asks for a Human68k version 3.02 disk image, dialog default HUMAN302.XDF with filter HUMAN302.???, extracts /BIN/FORMAT.X and writes SCSIINROM.DAT and SCSIEXROM.DAT.

The ROM Warning section of the Advanced options holds three startup checks, all enabled by default and individually suppressible: an IPLROM.DAT version check naming version 1.0 (05/07/1987) as recommended, a CGROM.DAT contents check and a SCSIEXROM.DAT / SCSIINROM.DAT contents check. Each raises a dialog; none rejects the file, so no hash below is enforced by the program.

Reference Manual.txt ships with the program and Software Notes.txt is fetched by the Web Package through Scripts\Update Notes.bat. Both are prose documents that the Help menu and Help > Peruse Notes hand to a text editor, not data XM6 parses. XM6.ini and XM6U.ini are written by the program.

12 files | 0 required, 12 optional | 11 in repo, 1 missing

IPLROM.DAT optional in repo built-in fallback
X68000 boot ROM, base SASI model

  • System: sharp-x68000
  • Size: min 128.0 KB
  • SHA1: 0ed038ed2133...
  • MD5: 7fd4caabac1d...
  • Validation: size
  • Source: Change Log.txt:125-126, README.txt:23-25, XM6 2.06 vm/memory.cpp:256-276
  • XM6.exe carries this ROM internally and only reads the file when it is present, so the emulator boots without it. The embedded copy sits at file offset 1337256 in .rdata of the Unicode build and 1288176 in the MBCS build, stored in the 16-bit pairwise swapped form the loader produces at vm/memory.cpp:278-285; unswapped it is the 131072-byte dump hashed here, catalogued by TOSEC as Sharp X68000 Boot ROM (1987)(Sharp), and it is the version 1.0 (05/07/1987) the startup warning recommends. README.txt:23-25 advises against installing the file at all because reading and swapping it only lengthens startup.

IPLROMXV.DAT optional in repo
X68000 XVI boot ROM

  • System: sharp-x68000
  • Size: min 128.0 KB
  • Validation: size
  • Source: XM6 2.06 vm/memory.cpp:178-180, XM6 2.06 vm/memory.cpp:261-263
  • Probed after the base machine loads. Its presence, together with SCSIINROM.DAT, is what makes the XVI machine available; absent, the base X68000 still runs. No internal copy is compiled into XM6.exe.

IPLROMCO.DAT optional in repo
X68000 Compact boot ROM

  • System: sharp-x68000
  • Size: min 128.0 KB
  • Validation: size
  • Source: XM6 2.06 vm/memory.cpp:181-185, XM6 2.06 vm/memory.cpp:264-266
  • Probed after XVI. Selects the Compact machine when found, and that machine also needs SCSIINROM.DAT. No internal copy is compiled into XM6.exe.

IPLROM30.DAT optional in repo
X68030 boot ROM

  • System: sharp-x68000
  • Size: min 128.0 KB
  • Validation: size
  • Source: XM6 2.06 vm/memory.cpp:186-190, XM6 2.06 vm/memory.cpp:267-269
  • Probed last. Selects the X68030 machine, which also needs ROM30.DAT. No internal copy is compiled into XM6.exe.

ROM30.DAT optional in repo
X68030 SCSI ROM

  • System: sharp-x68000
  • Size: min 128.0 KB
  • Validation: size
  • Source: README.txt:25, XM6 2.06 vm/memory.cpp:316-319, XM6 2.06 vm/memory.cpp:334-337
  • The SCSI half of the X68030 machine, and the only SCSI ROM read at 0x20000 bytes rather than 0x2000. Without it LoadROM(X68030) fails and the X68030 machine is not offered. README.txt:25 calls it non-critical and notes that installing it can cost performance.

CGROM.DAT optional in repo bundled
X68000 character generator ROM

  • System: sharp-x68000
  • Size: min 768.0 KB
  • SHA1: 8d72c5b4d63b...
  • MD5: cb0a5cfcf724...
  • Validation: size
  • Source: README.txt:277-278, Change Log.txt:129, XM6 2.06 vm/memory.cpp:287-295
  • Supplies the glyphs for text the X68000 renders. Stock XM6 v2.06 fails initialisation when neither font file loads; XM6 Pro-68k dropped that requirement, so a missing font ROM shows garbage glyphs and the emulator keeps running, and what remains is the suppressible contents warning. The mandatory DLL Package ships this exact 786432-byte file, catalogued by TOSEC as Sharp X68000 CG ROM (1987)(Sharp); the hash identifies that copy and is not verified by the program.

CGROM.TMP optional in repo
Synthesised font ROM, fallback when CGROM.DAT is absent

  • System: sharp-x68000
  • Size: min 768.0 KB
  • Validation: size
  • Source: README.txt:292-296, XM6 2.06 vm/memory.cpp:290-294
  • Read only when CGROM.DAT is missing, at the same size. Tools > Synthesize replacement CG-ROM writes it from the installed MS Gothic and MS Mincho fonts and fails when either is absent. No hash is declared because the output depends on the fonts of the machine that generated it. XM6 refuses to use it while CGROM.DAT is present.

SCSIINROM.DAT optional in repo bundled
Internal SCSI interface ROM, X68000 SUPER and later

  • System: sharp-x68000
  • Size: min 8.0 KB
  • SHA1: 15a17798839a...
  • MD5: aeb4607a1461...
  • Validation: size
  • Source: Reference Manual.txt:1529-1536, XM6 2.06 vm/memory.cpp:309-315
  • Needed to use internal SCSI drives, and also loaded as part of the XVI and Compact machines, so those two models are unavailable without it whatever their IPL. The mandatory DLL Package ships this exact 8192-byte file and the hash identifies that copy; the startup contents check only warns.

SCSIEXROM.DAT optional missing bundled
External SCSI interface ROM, CZ-6BS1 board

  • System: sharp-x68000
  • Size: min 8.0 KB
  • SHA1: 49616c09a898...
  • MD5: 237be014374b...
  • Validation: size
  • Source: Reference Manual.txt:1529-1536, XM6 2.06 vm/memory.cpp:320-324, XM6 2.06 vm/memory.cpp:346-357
  • Needed to use the external SCSI interface, which is the only SCSI variant that can coexist with SASI. The loader first reads 0x2000 bytes and, on failure, retries with the 0x1fe0-byte WinX68k layout loaded at buffer offset 0x20, so 8160 is the real floor. The mandatory DLL Package ships the 8192-byte form hashed here.

SRAM.DAT optional in repo
X68000 SRAM image, boot device and memory switch settings

  • System: sharp-x68000
  • Size: 16.0 KB
  • Source: Reference Manual.txt:1366-1368, Reference Manual.txt:2648-2651, XM6 2.06 vm/filepath.cpp:404
  • Read at startup and rewritten on exit when the contents changed, so XM6 creates it on first run and a supplied image only preloads the settings. The Tools > SRAM menu reloads, duplicates and write-protects it, and the boot counter option updates it on exit. Size is the X68000 SRAM size and is not checked by the program.

7z.dll optional in repo bundled
7-Zip library for .7z, .zip and .xz support

  • System: sharp-x68000
  • Source: README.txt:166-170, XM6.exe strings 7z.dll, Optional DLL Not Present
  • Absent from the import directory and looked up by name at runtime, so XM6 starts without it and reports Optional DLL Not Present, Archive support is not available. Enables loading disk images and state files from archives and writing XZ-compressed state files.

zlib1.dll optional in repo bundled
zlib, used for PNG output and deflate archives

  • System: sharp-x68000
  • Source: README.txt:322-323, XM6.exe strings 7z.dll or zlib1.dll
  • Looked up by name at runtime alongside 7z.dll and named in the same Optional DLL Not Present dialog. README.txt:322-323 credits the PNG Reference Library and zlib for the screenshot support.

Generated on 2026-08-23T16:12:06Z