翻訳と辞書 Words near each other ・ S-(hydroxymethyl)mycothiol dehydrogenase ・ S-1 block cipher ・ S-1 Gard ・ S-1 Lisp ・ S-1 Uranium Committee ・ S-100 bus ・ S-125 Neva/Pechora ・ S-13 rocket ・ S-130/S-190 training courses ・ S-14,506 ・ S-14671 ・ S-15535 ・ S-160 ・ S-17092 ・ S-18986 ・ S-1990 ・ S-200 (bioremediation) ・ S-200 (missile) ・ S-210 ・ S-23 (drug) ・ S-24 rocket ・ S-25 (rocket) ・ S-25 Berkut ・ S-300 (missile) ・ S-300VM ・ S-310 ・ S-350 ・ S-400 (missile) ・ S-40503 ・ S-444,823 Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク S-1990 ： ウィキペディア英語版 S-1990 The S-1990 is a VLSI integrated circuit created by NEC for the MSX Turbo R home computer, and is called the "Turbo R bus controller". Together with a R800 CPU and a T9769 MSX-Engine chip it forms the heart of a Turbo R MSX-system. ==Development and design== The S-1990 was especially developed for "MSX turbo R computers" which are outfitted with an ASCII R800-processor. To retain backward compatibility with the older MSX 1, MSX 2 and MSX 2+ systems the Turbo R also uses the Z80 CPU inside the T9769. The S-1990 is used to control the bus access so that either the R800 or the Z80 inside the T9769 can access the memory and peripherals. Because of the comparatively greater speed of the R800 (a relative speed of 28.636360 MHz compared to the 3.58 MHz; or 7.16 MHz in MSX2+ machines; of the Z80) the S1990 also implements a "wait state" mechanism to slow down access to slower legacy devices (especially for the peripherals in the T9769, in particular the video display controller) that otherwise could not keep up with the R800. It also implements hardware assisted software debugging. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「S-1990」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.