GROB

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

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

There are two ways to encode a GROB image: "binary" and "ASCII". Sometimes, GROB images are also ASC-encoded.

Contents

Format

Binary format has an 18-byte header, followed by the pixel data.

Identification

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

ASCII format apparently begins with "GROB ". An ASCII GROB might be embedded inside a script, or preceded by a "%%HP" header line, so it won't necessarily start at the beginning of the file.

Software

Sample files

Binary

ASCII

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