Showing papers by "Apple Inc. published in 1980"
Patent•
08 Jan 1980TL;DR: In this article, a video generator and timing means for color and high-resolution graphics on a standard, raster scanned, cathode ray tube is described, where a horizontal synchronization counter is synchronized at an odd-submultiple of the color subcarrier reference frequency.
Abstract: A microcomputer including a video generator and timing means which provides color and high resolution graphics on a standard, raster scanned, cathode ray tube is disclosed. A horizontal synchronization counter is synchronized at an odd-submultiple of the color subcarrier reference frequency. A "delayed" count is employed in the horizontal synchronization counter to compensate for color subcarrier phase reversals between lines. This permits vertically aligned color graphics without substantially altering the standard horizontal synchronization frequency. Video color signals are generated directly from digital signals by employing a recirculating shift register.
36 citations
Patent•
16 May 1980TL;DR: In this article, a microcomputer system with video display capability, particularly suited for small business applications and home use, is described, where the CPU performance is enhanced by permitting zero page data to be stored throughout the memory.
Abstract: A microcomputer system with video display capability, particularly suited for small business applications and home use is described. The CPU performance is enhanced by permitting zero page data to be stored throughout the memory. The circuitry permitting this capability also provides a pointer for improved direct memory access. Through unique circuitry resembling "bank switching" improved memory mapping is obtained. Four-bit digital signals are converted to an AC chroma signal and a separate luminance signal for display modes. Display modes include high resolution modes, one of which displays 80 characters per line.
20 citations
Patent•
11 Feb 1980TL;DR: In this paper, a control signal for a communication line duplexer or other isolation means is presented. But the authors do not specify a control scheme for the communication line itself, except to use phase detection to detect the real and imaginary components of the duplex.
Abstract: A circuit for generating a control signal for use in a communication line duplexer or other isolation means. The transmitted signal at the output of the duplexer is phase detected to detect its real and imaginary components. These components are used to modulate the transmitted signal which is then injected into a feedback loop of the duplexer. This substantially cancels the transmitted signal at the output of the duplexer. The circuit permits the communication line to be terminated in a constant impedance.
15 citations
TL;DR: The authors investigated the effects of second language learning on the voice onset time values employed for productions of word initial stop consonants in Spanish and English words by two native Spanish speaking siblings were compared, and found that delayed language development interfered with the acquisition of a new language specific phonemic contrast.
11 citations
01 Feb 1980
2 citations
TL;DR: In this paper, a study on the hydrogen-bromine reaction scheme is presented, which is based on the Bromine Reaction Scheme (BRS) and is described as follows:
Abstract: (1980). Studies on Hydrogen—Bromine Reaction Scheme. Combustion Science and Technology: Vol. 21, No. 3-4, pp. 181-182.