The original Graphic Calculus was designed and programmed first for 380Z computers, then BBC computers, then the Archimedes computer by David Tall. Many early articles have pictures taken from these, however, they are no longer commercially available.
The original IBM PC version of Graphic Calculus is still available from Rivendell Software. for information.
The current version of Graphic Calculus for Windows is available from the VUSoft web-site.