scott instruments ShadowCache card?

Subject: scott instruments ShadowCache card?
From: aiiadict@gmail.com
Date: Mon, 25 Aug 2008 18:41:11 -0700 (PDT)
Complaints-to: groups-abuse@google.com
Injection-info: z11g2000prl.googlegroups.com; posting-host=71.143.6.124; posting-account=5kmk9wkAAAB22-WWGK8UTn8vQ5c3EvdQ
Newsgroups: comp.sys.apple2
Organization: http://groups.google.com
User-agent: G2/1.0
Xref: g2news1.google.com comp.sys.apple2:2766

anyone know what this does?