Microprocessor based computer terminal
US4405978A · kind A · utility
6Cited by
6References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1979 |
| Grant date | Sep 20, 1983 |
| Priority date | — |
| Expiry date | Jun 25, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G5/222
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for conducting input output operations with another data processing device in a flexible and low cost manner is comprised of a programmed microprocessor coupled to a keyboard, a parallel port, and a modem. The microprocessor is programmed to periodically scan the keyboard to determine what keys if any are depressed. It also scans the parallel port for incoming data and senses incoming data from the modem by sensing a start bit. Control characters from the keyboard can set options such that incoming data from an input can be simultaneously sent out from the modem and/or parallel port.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.