GROB

File Format
Name	GROB
Ontology	Electronic File Formats Graphics GROB ; ; ;
Extension(s)	.grb, .gro, others
Released	~1990

GROB is a raster graphics format associated with HP-48 and HP-49 series calculators.

There are at least two ways to encode a GROB image: "binary" and "ASCII". There may also be a third encoding called "text" or "ASC".

Identification

A binary GROB file begins with "HPHP48" or "HPHP49", and has bytes 1E 2B at offset 8.

ASCII format apparently begins with "GROB "