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The Intel 8755 is an UV- erasable and electrically reprogrammable ROM (UV-EPROM) and I/O chip. The EPROM portion has 16 384 bits, organized as 2048 words by 8 bits. The I/O portion has two general purpose I/O ports, each I/O port is individually programmable as input or output. These were essentially a combination of the 8255 PIO and the 2716 EPROM on a single die/ package. These were made on a NMOS process. [IntelC8755-8-] [IntelC8755A-4] [NECD8755AD-107] [ToshibaTMP875] Intel C8755-8 - Intel C8755A - NEC D8755AD Toshiba TMP8755AC 1977 1979 -1981 '83 NEC and Toshiba released similar microcircuits behind Intel. Basically, the microcircuit was intended to work together with the 8085A microprocessor. It differs from its predecessor i8080A in that it has a multiplexed data and lower address bus. The standard three-bus architecture of the microprocessor system is obtained by multiplexing with the help of an additional external register. In this register, the low byte of the address is fixed by the special output signal of the microprocessor. [IntelD87C75PF-ES] Intel 87C75PF Engineering Sample - 1988 By 1988, the 8755A was obsolete and Intel released the 87C75 instead (see article on the CMOS 87C75). [SovietNovosibirskIM1821VM85A] Novosibirsk IM1821VM85A - 1989 Around this time, the production of an analogue of the i8755A, the 573RF10 microcircuit, began in the Soviet Union. Why start producing a microchip that the world electronics leader is changing to a more advanced one? The fact is that at the beginning of 1988, the production of IM1821VM85A began in the USSR. This was a radiation hard analogue of the CMOS i80C85A. It was with it that the 573RF10 was supposed to work. [4-1-300x300] [5-1-300x290] K573RF10E (gold pins) 1990 KM573RF10 - Gold '92 / tin pins '93 The chip is made in a 40-pin side-brazed ceramic DIP. Supply voltage +5 V. Programming voltage +21 V. It was produced at the Vostok fab in Novosibirsk on a CMOS process (to match the 80C85A). [SovietKM573RF10] Unmarked 573RF10 The 573RF10 is the only CMOS chip in the 573 series. [6-1-300x272] [7-1-300x270] 573RF10 die - single memory cell - Intel 8755A die - 2 memory radiopicture.listbb.ru cells - cpu-galaxy.at It is noticeable to the naked eye that the 573RF10 is own Soviet development. The 573RF10 and i8755A dies are completely different. The i8755 has two memory arrays clearly visible, while the 573RF10 has only one. It must be said that the application of the 573RF10 chip was not wide enough. And in general, the idea did not take root. The next obvious step in evolution was the combination of a microprocessor, ROM and RAM, input-output ports in one chip which was frequently done on the MCS-48 and MCS-51 series MCU's which were also being produced in the Soviet Union at the time. Written by guest author Vladimir Yakovlev Edited/Formatted by John Culver - The CPU Shack Museum Pictures - The CPU Shack Museum and others [INS::INS] Posted in: CPU of the Day << The History of Angstrem Memory IC's in the USSR Leave a Reply [ ]Name (required) [ ]Mail (will not be published) (required) [ ]Website [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [ ] [Submit] [ ] [ ] [ ] [ ] [ ] [ ] [ ] D[ ] * RSS Feeds * The Largest CPU Museum! In my daily hunt for new processors, and other chips for the museum, as well as information about new chips, I constantly come across interesting chips, in strange locations. Here you will get a chance to learn WHERE many of the chips in the museum come from and what they are. Latest CPU Images here They are sorted by manufacturer (technically brand) and thumbnails are now WORKING. 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