Before the IBM 5150: the forgotten 25kg "portable" IBM 5100 from 1975
emax · x · 2026-10-19
Curious why IBM's first PC was numbered 5150, the author dug up the IBM 5100 (1975): a 25kg "portable" costing $8,975–$19,975 that could emulate System/360 and System/3 mainframes via a physical switch — architectures still running banks and governments today. Plus memories of the IBM PC XT.
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