Colour Bar

Colour Bar provides a full colour test pattern to confirm operation of the display.  I don't have any provenance for this cartridge, but the only other copy I’ve seen (a picture of) was with a dealer who had visited the Dragon Data and had been provided support to aid repairs. This all points towards an internal Dragon Data tool that was also supplied to limited repairs/dealers.

The ROM dump has been checked and there is no evidence of an author or any operation beyond displaying the colours bars.