This unit 8219 273 3747.3 is based on a Ucontroller M5840H-141 from OKI and other ASICS such as SAB3013 and LM339N to drive all tuning and search / Linear functions and all remote control features.
(The OKI Microcontroller is obviously "ROM Masked" by PHILIPS)
Oki Electric Industry Co., Ltd. (沖電気工業株式会社 Oki Denki Kōgyō Kabushiki-gaisha) (TYO: 6703), commonly referred to as OKI, OKI Electric or the OKI Group, is a Japanese company manufacturing and selling info-telecom and printer products. Headquartered in Tokyo, Japan, OKI operates in over 120 countries around the world.
OKI manufactured the first telephone in Japan in 1881, and now, after more than 120 years the company specializes not only in developing and manufacturing telecommunication equipment but also in information products and mechatronics products, such as Automated teller machine(ATMs) and printers. Its printer business is operated through OKI Data, under the brand name, OKI Printing Solutions. OKI had a semiconductor business, in which it spun off and sold to Rohm Co., Ltd., on October 1, 2008.
OKI provides products to telecom carriers, financial institutions, government agencies, large corporation as well as SMBs both directly and via distributors and dealers.
The channel memory is backed up by a NiCd battery on the board and the RAM is even embedded in the M5840H-141.
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