Following the restauration of Xerox Alto


Now that the Alto finally boots, we investigate why some programs, including the all important MADTEST hardware diagnostic, crash. This leads us to another wild hardware bug chase in the control RAM logic. For detailed technical background, see Ken’s blog posting here:…


We solve the crashing problem, which was due to a Control ROM / CRAM board mismatch. Which allows us to finally run the diagnostic test suite. Which gives us a clean bill of heath! If we only had a mouse that worked, we could use the Alto! PARC, whose support has been unwavering, lends us an original mouse on the spot later that day, and I get to try the famed GUI for the first time.
As usual, more technical details in Ken’s blog entry:…



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