This checks out! Jayeson Lee-Steere designed a ram module for Model 600 based off looking at an original ram module I sent him. Released it as public domain andnposted to oshpark.
I just recieved the pcbs today and built one and tested it crudely. There isn't any ram test program, so I just did a hard reset, copied a bunch of files from disk and typed a few K junk word doc, and copied the word doc untill all ram was used up. basic.!55 is copied to ram and runs a largish basic program without apparent error. 96k ram module for Tandy Model 600 by Jayeson Lee-Steere PCB: https://oshpark.com/shared_projects/dtTFNcqw Parts: http://www.digikey.com/short/3r12m5 https://drive.google.com/folderview?id=0Bys6eLbSbYyhbTNxc0J0LWFjVXc -- bkw
