The current URL is datacrystal.tcrf.net.
Sega Genesis:Rhombus
A 68000 and Z80 tracing disassembler / “Swiss army knife” for disassembling and editing binaries. Rhombus can parse Motorola 68000 and Zilog 80 ROM files and programs through both its GUI and Command Line interfaces. Rhombus also includes a 4bpp tile editor, palette editor, and a hex editor with a 68000 assembler look-up dictionary to make binary patching easier. There is also a text finder which can find ASCII, JIS 0208, and Shift-JIS text in binaries and may be useful for translation, as well as a comprehensive command-line interface with a TSV output format option to integrate with other tools and workflows.
Provided as-is, free for non-commercial use only. Contact for pricing for commercial or other use. Please also contact regarding any bugs or feature requests: @jamal_zedman on Twitter, or JamaL on RomHacking.net
See either Rhombus's RomHacking.net page or Rhombus's SegaRetro wiki page for general usage information and how to download.