Videotex terminal apparatus using an IBM PC XT

Details Videotex terminal apparatus using an IBM PC XT Videotex terminal apparatus using an IBM PC XT

1994-12-22

1997-06-24

Chan, Wing F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

364514A, H04M 1100

Patent

active

056424086

ABSTRACT:
A videotex terminal apparatus using a chipset of an IBM PC XT ("XT"), and in particular, to a videotex terminal apparatus using the XT capable of providing high display resolution and easy maintenance using a simple chip set used in the XT in the terminal providing the videotex and the VT-220 is disclosed. The present invention includes a central processing controller for accessing chips therearound and for processing information from a data bus and an address bus, respectively, and for an encoding data related to the videotex, a buffer for buffering an address transferred from the central processing controller and the data received from therearound, a memory for storing the data obtained from the buffer and for outputting a corresponding character and a special code data through a modem controller or a serial communication controller, and a video graphic adapter controller for processing the corresponding character and the special code data obtained from the memory in a form of video signals and for displaying the processed data on the monitor.

REFERENCES:
patent: 4691340 (1987-09-01), Maeda et al.
patent: 4694406 (1987-09-01), Shibui et al.
patent: 4739402 (1988-04-01), Maeda et al.
patent: 5025373 (1991-06-01), Keyser, Jr. et al.

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