The original program was written entirely in assembly language with primitive graphics routines developed by Wolfgram.

[citation needed] Mouse Systems wanted the paint program to capture the look and feel of MacPaint.

The program was completely re-written using Bridge's graphics library and the top-level elements were written in C rather than assembly language.

In creating the first version of PCPaint, Doug had a dual-floppy machine with a Computer Innovations compiler on one disk and source code on the other.

John Bridges and Wolfgram continued to work on PCPaint and GRASP on behalf of Paul Mace Software until 1990.

Also in that year, Doug Wolfgram sold his remaining rights to PCPaint (and its animation system, GRASP) to John Bridges.

[1] PCPaint 1.0 saved its graphics in a modified BSAVE image format (which was popular at the time) with the file type (extension) of ".PIC".