I know very little about Geoffrey Silverton. In 1990/91 he lived in Potomac, Maryland, and wrote two games, Popgames and Tunneler.
Both are absolutely unique in some way. Popgames is the only collection of memory resident games I know, and maybe the only one that ever existed. Tunneler is probably the only game that uses an undocumented low-resolution (160x100) 16-color video mode available on all color graphics adapters for the PC.
The only references to Geoffrey Silverton you find on the web refer to either game (usually tunneler) or to this video mode, a documentation for which he sold at the time for a low fee. Other than that, he seems to have vanished without a trace.
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