Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!linus!cca!decvax!harpo!floyd!vax135!ariel!houti!hogpc!houxm!ihnp4!stolaf!umn-cs!smith From: smith@umn-cs.UUCP Newsgroups: net.micro Subject: Re: Re: Micro-Logic Analyzer - (nf) Message-ID: <226@umn-cs.UUCP> Date: Sun, 5-Jun-83 20:31:07 EDT Article-I.D.: umn-cs.226 Posted: Sun Jun 5 20:31:07 1983 Date-Received: Tue, 7-Jun-83 20:48:43 EDT Lines: 14 #R:ihnss:-151400:umn-cs:6900010:000:546 umn-cs!smith Apr 26 09:39:00 1983 I used to work for a company that did speech recognition work, and our primary debugging tool for these dreadful programs was a scope driven by an A/D converter. All of your favorite bugs (overflow, underflow, etc) showed up as spikes or other weird effects that contrasted against the otherwise recognizable waveforms. I suspect this trick was first used on the Whirlwind I computer at MIT, possibly in the late 1940s. There's a photo of them using a scope driven by the computer in the 1951 IRE (nee IEEE) conference preceedings. Rick.