Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!linus!philabs!cmcl2!floyd!vax135!ariel!houti!hogpc!houxm!hocda!spanky!burl!we13!ihnp4!ixn5c!inuxc!pur-ee!CSvax:Pucc-H:Physics:hal From: CSvax:Pucc-H:Physics:hal@pur-ee.UUCP Newsgroups: net.micro Subject: Re: Re: Light Pens vs. Mouse - (nf) Message-ID: <802@pur-phy.UUCP> Date: Fri, 1-Jul-83 17:05:15 EDT Article-I.D.: pur-phy.802 Posted: Fri Jul 1 17:05:15 1983 Date-Received: Thu, 7-Jul-83 19:47:32 EDT Lines: 15 #R:houxm:-45600:pur-phy:7800006:000:557 pur-phy!hal Jul 1 13:22:00 1983 The same restrictions hold for a mouse; without something visible on the screen, you are working blind. Mouse and lightpen both have to be connected to something to provide visual feedback. This can be a cursor (whether a crosshair, arrowhead, or little finger doesn't mattter), window edge, rubber band, etc. Thus you can point to a "blank" area of the screen with a light pen since the screen isn't truly blank. The most convincing argument against the lightpen I have seen so far is that it may be too tiring for extended use. Hal (pur-phy)