I have been investigating redundant technologies. In particular drawing interfaces with 8 bit computers. In particular the Commodore 64.
There are two reasons for choosing the C64. The first is that I managed to acquire two working consoles, and the second is that it was the first computer I experienced.
I have discovered that there were a number of interesting interfaces that could be used to draw with a C64.
Before Wacom, the Koalapad was an interface that could be used as a grahpics tablet even though it was designed to be used for accountants and data input. Occasionally there have been Koalapads for sale on Ebay, however, they seem to be sort after and rare as they are reasonably expensive.
The CAD-MASTER LIGHT PEN.
The Cad-master Light Pen is an interface that connects through the controller port of the C64. The pen is then used directly on the monitor screen, which needs to be a tube screen. It works by transmitting and receiving light in the same way the zapper gun did in the Commodore 64 game Duck Hunt. I have bought a Cad-master Light Pen and a copy of the software ready to use with my C64 and an old JVC TV.