NEAC 2206

The first machine of NEAC-2206 was delivered to Hokkaido University in March 1962 as the successor of the NEAC-2203. It used core memory as internal memory, as well as for input/output and control of auxiliary memory devices, and this simplified peripheral devices, improved data transmission capabilities, and allowed format control to be done electronically. In addition to the previous regenerative amplifiers, no-delay amplifiers and non-logic simple amplifiers were developed for logic circuit elements, and this enabled design of the complex logic circuits necessary for achieving parallel operation and higher speed. The system also reduced the number of program steps by employing compound instructions (using 1-word/1-instruction for instruction words) and modification designation. It also advanced the interrupt capabilities developed with the NEAC-2203, and had comprehensive multi-programming and real-time processing capabilities.