History of EDA (electronic design automation)?

We have the chips produced from earlier eras, but what attempts have been made to preserve the design tools from those earlier eras? Schematic Capture PCB Layout Netlist Tools IC transistor-level design IC gate-level design etc. I know several of you out there have microprocessor development environments from Intel and TI, IIRC. Ditto for things like PROM programmers. What about the design software? I imagine the first generation of EDA software was created in-house by pioneers of VLSI design. But what about when the tools started to become commodities? What about early releases of software from a company like Mentor Graphics? -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://blogs.xmission.com/legalize/>