The Worst-selling Microsoft Software Product of All Time: OS/2 for the Mach 20

Raymond Chen at ‘The Old New Thing’ has a lovely tale about what could be Microsoft’s worst selling product ever – OS/2 for the Mach 20.


According to that person’s memory (which given the amount time that has elapsed, means that we should basically be saying “according to legend” at this point), a total of eleven copies of “OS/2 for Mach 20” were ever sold, and eight of them were returned.

Raymond Chen, The Old New Thing.

I’ve seen a few expansion cards as part of choosing images for ‘Retro Computer Adverts‘, but the Mach 10| 20 is not one I’ve yet stumbled across. And as for ads for ‘OS/2 for Mach 20’? Not a sausage!

The cost of a PDP-11 circa 1971

Whilst trying to track down the cost of memory for a PDP-11 I stumbled across The PDP-11 FAQ and it’s rather excellent collection of early 70s PDP-11 price lists. It’s a fun little list, rammed through of interesting little nuggets – today it’s hard to imaging it but in 1972 a line printer would have set you back at least 12,000 USD. That’s almost 92,000 USD in 2025 prices!

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