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mainframe × 30history × 15
ibm × 8
hardware × 6
terminal × 6
minicomputers × 5
programming × 2
operating-system × 2
floating-point × 2
magnetic-tape × 2
punched-cards × 2
apl × 2
emulation × 1
intel × 1
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motorola-68000 × 1
file-format × 1
serial × 1
sound × 1
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text × 1
printer × 1
ascii × 1
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