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- Notes on IBM 370
- Notes on IBM 360
- Notes on XBox 360
- Notes on Apache Spark 2
This is the replacement for the IBM 360 series.
My favorite model was the 370/168. There was one at Uni-Col in Pennsylvania.
A computer for all: Contrasting with at-the-time normal industry practice, IBM created an entire new series of computers, from small to large, low to high performance, all using the same instruction set (with two exceptions for specific markets). This feat allowed customers to use a cheaper model and then upgrade to larger systems as their needs increased without the time and expense of rewriting software. Before the introduction of System/360, business and scientific applications used different computers with different instruction sets and operating systems. Different-sized computers also had their own instruction sets. IBM was the first manufacturer to exploit microcode technology to implement a compatible range of computers of widely differing performance, although the largest, fastest, models had hard-wired logic instead.
This flexibility greatly lowered barriers to entry. With other vendors, customers had to choose between machines they could outgrow and machines that were potentially overpowered (and thus too expensive). This meant that many companies simply did not buy computers.