GEM VDI Metafile

GEM VDI Metafile (also called GEM Metafile, GEM Vector, or GEM VDI) is a vector graphics metafile format associated with the GEM operating environment by Digital Research.

Identification
Files begin with bytes.

Following that is a two-byte integer reflecting the header size. It may use either big-endian or little-endian byte order. Likely values are,  , and maybe.

Specifications

 * http://www.fileformat.info/format/gemvector/spec/index.htm
 * GEM Programmer's Guide Vol. 1, Appendix C
 * GEM VDI Reference Guide (v2.0), Appendix B

Sample files

 * http://www.page6.org/st_lib/standard/st0393.php
 * https://telparia.com/fileFormatSamples/image/gemMetafile/
 * https://telparia.com/fileFormatSamples/image/gemMetafile/
 * https://telparia.com/fileFormatSamples/image/gemMetafile/

Links

 * , from the Encyclopedia of Graphics File Formats
 * Wikipedia: GEM