And the Model M is actually the result of a series of cost-reduction measures from prior IBM keyboards, and received numerous cost-cutting changes during its pr

And the Model M is actually the result of a series of cost-reduction measures from prior IBM keyboards, and received numerous cost-cutting changes during its production cycle. Though I'd guess it was a standard accessory - you gonna order an IBM AT PC without a keyboard? Probably not. And that AT would have been around 5000 $ or so, so 250 $ for the keyboard isn't that outrageous. Computers were expensive.