NEAC-2203 | 1961

NEAC-2203

 

NEC Corporation (NEC) developed the NEAC-2203 transistor computer based on the NEAC-2201, with the goal of practical business processing. The first unit was delivered in May 1959. In June 1959, at the AUTOMATH International Conference on Information Processing in Paris (AUTOMATH: International Conference on Information Processing, sponsored by UNESCO), NEC exhibited the NEAC-2201 and demonstrated it as the world's first commercial transistor computer.

The NEAC-2201 used vacuum tubes in its clock oscillator, power supply unit, and peripheral circuits for the magnetic drum unit, but in the NEAC-2203, these vacuum tubes were all replaced by transistors. In addition to the fixed-point arithmetic mode, a floating-point arithmetic mode was also added. The memory system was configured in three levels: 240 words of magnetic core memory, a high-speed magnetic drum with a capacity of 2,000 words (rotating at 10,000 revolutions per minute), and a 10,000-word magnetic drum with a capacity for up to 10 drums (rotating at 1,500 revolutions per minute).

The development of the NEAC-2203 focused on the Electronic Data Processing System (EDPS) and the development of peripheral devices and their control units. Various peripheral devices, including card readers, card punches, line printers, and magnetic tape devices, were developed and connected.

The NEAC-2203 was equipped with interrupt functionality, enabling time-sharing to run three programs simultaneously. This allowed for concurrent input/output operations and arithmetic processing. A total of 30 units of the NEAC-2203 were shipped, which was a remarkable number for the time. The NEAC-2203 was used in various fields.

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