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YM2203
The YM2203, a.k.a. OPN (FM Operator Type-N), is a six-channel (3 FM and 3 SSG) sound chip developed by Yamaha. It was the progenitor of Yamaha's OPN family of FM synthesis chips used in many video game and computer systems throughout the 1980s and early 1990s. It was used in a variety of NEC computers, along with various arcade game machines. The YM2203 and the rest of the OPN synthesizer family generate sound via frequency-modulated digital sine waves. It included 12 operator "cells", each generating a 13-bit sine wave at a programmable frequency, the volume of which is controlled by a programmable ADSR envelope generator. The output of these cells could be either summed together by the mixer, or fed into the input of another cell, in 4-cell batches creating the final sound values or "channels". 4 operator cells per channel allowed a total of 8 different permutations of cell connections, known as "algorithms". The ADSR parameters, multiplier and detune settings for each opera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
NEC PC-8801
The , commonly shortened to PC-88, are a brand of Zilog Z80-based 8-bit home computers released by Nippon Electric Company (NEC) in 1981 and primarily sold in Japan. The PC-8800 series sold extremely well and became one of the three major Japanese home computers of the 1980s, along with the Fujitsu FM-7 and Sharp X1. It was later eclipsed by NEC's 16-bit PC-9800 series, although it still maintained strong sales up until the early 90s. NEC's American subsidiary, NEC Home Electronics (USA), marketed variations of the PC-8800 in the United States and Canada. History Nippon Electric's Microcomputer Sales Section of the Electronic Device Sales Division launched the PC-8001 in September 1979, and by 1981 it consisted of 40% of the Japanese personal computer market. In April 1981, Nippon Electric decided to expand personal computer lines into three groups: New Nippon Electric, Information Processing Group and Electronic Devices Group, with each specializing in a particular series. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
