GROB

From Just Solve the File Format Problem
(Difference between revisions)
Jump to: navigation, search
(Identification)
Line 15: Line 15:
 
A binary GROB file begins with "<code>HPHP48</code>" or "<code>HPHP49</code>", and has bytes <code>1E 2B</code> at offset 8.
 
A binary GROB file begins with "<code>HPHP48</code>" or "<code>HPHP49</code>", and has bytes <code>1E 2B</code> at offset 8.
  
ASCII format apparently begins with "<code>GROB </code>"
+
ASCII format apparently begins with "<code>GROB </code>". An ASCII GROB might be embedded inside a script, or preceded by a "<code>%%HP</code>" header line, so it won't necessarily start at the beginning of the file.
  
 
== Software ==
 
== Software ==

Revision as of 00:54, 7 August 2014

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

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox