GROB

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  at offset 8.

ASCII format apparently begins with " "

Software

 * XnView
 * grob.to.bitmap
 * grob2eps.c

Binary

 * GROBS1.ZIP, GROBS2.ZIP
 * grobs49.zip

ASCII

 * supercarsgrob.zip