"Historic Software" is what the Germans call "Unwort". A political term that does not describe anything really existent.
A quote from Ward with respect to his pdp8sim, computer museums and historic software:
"...we are now seeing a proliferation of computer museums, both physical and virtual, every one of them enshrines programs that run or the machines that run them. Not one believes that anyone would want to look at the listings."
This is not true, I do. Look at http://home.arcor.de/magnos/ccg/introccg.html.
Of course, most people want to read programs for machines they run themselves and I am no exception.
You're not disagreeing with Ward, you're in ViolentAgreement with what he said. There are a vast number of individuals who are interested in HistoricSoftware listings, but he said museums don't believe that to be the case. Your link is not to a museum, it's to an individual effort. There are thousands of such on the web. To make Ward's point more carefully: I would say that at least some of the volunteer/paid staff at places like the ComputerHistoryMuseum? [OnLineComputerMuseum] actually are aware that such individuals exist, but they don't believe that their primary audience - the average museum visitors - have any such interest.