This article by Dag Spicer has good coverage of the background of the ECHO IV and the interview with Ruth Sutherland is priceless. Coincidentally a different w

This article by Dag Spicer has good coverage of the background of the ECHO IV and the interview with Ruth Sutherland is priceless. Coincidentally a different writeup on the ECHO IV can be found in the CHM's Volunteer Newsletter of last fall[1]. It has some different pictures, more technical details on the machine's architecture, and links to some other sources, including a gallery of pictures of the ECHO hardware in the CHM collection[2]. [1] http://s3data.computerhistory.org.s3.amazonaws.com/chmedu/VIE_05_008.pdf http://s3data.computerhistory.org.s3.amazonaws.com/chmedu/VI... (PDF) [2] https://cortesi.smugmug.com/Other/ECHO-IV-article/ https://cortesi.smugmug.com/Other/ECHO-IV-article/