 Among those whose first experience of home computing was provided by the ZX81 are Terry Pratchett ( who used it for " very primitive word processing " ) , Edward de Bono and – perhaps proving William Gibson 's point – many video game developers including Charles Cecil , Raffaele <unk> , Pete Cooke , David Perry ( whose first published game , a driving game , involved " a black blob avoiding other black blobs " ) , Rhianna Pratchett , and Jon Ritman . 
