Notes on IBM 360

IBM 360 model 30Introduced in 1964

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.

Notes on XBox 360

The Xbox 360 is a home video game console developed by Microsoft. As the successor to the original Xbox, it is the second console in the Xbox series. It competed with Sony‘s PlayStation 3 and Nintendo‘s Wii as part of the seventh generation of video game consoles. It was officially unveiled on MTV on May 12, 2005, with detailed launch and game information announced later that month at the 2005 E3 expo.