Programming Languages
The 5100 was available with APL, BASIC, or both programming languages. At the time of introduction, APL was generally available only on mainframe computers, and most desktop sized computers such as the Wang 2200 or HP 9830 offered only BASIC.
Machines that supported both languages provided a toggle switch on the front panel to select the language. When the engineers at IBM asked one beta tester, Donald Polonis, for his analysis, he commented that if folks had to learn APL to use it, the IBM 5100 would not make it as a personal computer. He tried to impress the fact that a personal computer had to be easy to use to be accepted. Presumably, the special APL character set and APL keyboard were the primary obstacles to newcomers learning APL easily. APL had powerful features for manipulating data as vectors and matrices, while the competing HP 9830 had to offer language extensions on an add-on ROM for matrix operations.
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