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RAM was quite small in the unexpanded systems (a few hundred bytes to a few kilobytes). By 1976 the number of pre-assembled machines was growing, and the 1977 introduction of the "Trinity" of Commodore PET , TRS-80 and Apple II generally marks the end of the "early" microcomputer era, and the advent of the consumer home computer era that followed.
RCA Spectra 70 Model 46. RCA was one of a number of companies in the 1960s that entered the mainframe computer field to challenge the market leader International Business Machines (IBM). Although at this time computers were almost universally used for routine data processing and scientific research, in 1964 Sarnoff, who prided himself as a ...
RCA CDP1802 die shot. The COSMAC (Complementary Symmetry Monolithic Array Computer) is an 8-bit microprocessor family introduced by RCA. It is historically notable as the first CMOS microprocessor. [1] The first production model was the two-chip CDP1801R and CDP1801U, which were later combined into the single-chip CDP1802. [2]
The Capacitance Electronic Disc (CED) is an analog video disc playback system developed by Radio Corporation of America (RCA), in which video and audio could be played back on a TV set using a special stylus and high-density groove system similar to phonograph records.
From 1931 RCA produced a range of small mantel radios called the Superette, which at introduction sold for $57.50 not including the vacuum tubes. [5] [6] "Super" was derived from superheterodyne. Probably the most well known is the Model R-7, which was produced in several versions. RCA also produced a console version, the model R-9.
RCA Spectra 70 Model 46. The RCA Model 70/46 (1967) [12] is a modified version of the 70/45 with an added capability for virtual memory. Advertisements for this computer as a timesharing machine referred to it as the Octoputer. [13] Programs can run in either 70/45 mode—without virtual memory—or in 70/46 mode with virtual memory enabled.
The RCA 501 utilized advanced manufacturing techniques such as pluggable card units or printed circuit boards.It also included a centralized operating console, from which the operator could control all aspects of the computer from one location, including starting and stopping of programs. [2]
The directionality of the 77-DX is variable. A rotating backshutter on the acoustic labyrinth, controlled by a screwdriver-operated slot at the rear of the microphone, allows the user to vary the microphone's pattern from omnidirectional in the fully closed position, to cardioid, to figure-8 (bidirectional) in the fully open position.
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