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5 posts
How IBM's 1401 paired transistorized processing, variable-length records, card and tape I/O, and a lower entry cost to broaden commercial computing.
Understand how the 3270's local screen buffer, field attributes, and structured data stream differed from character-at-a-time terminals.
Examine IBM's 23FD Minnow, an 8-inch read-only diskette built to distribute mainframe microcode and replace cumbersome update media.
How IBM's 1964 System/360 replaced incompatible product lines with a shared architecture, standard byte and I/O model, and a difficult software transition.
Trace CP/CMS from an IBM research project to VM/370, and separate the virtual-machine idea from virtual memory and modern cloud assumptions.