Title: Microcomputer terminal system having a list mode operation for the video refresh circuit

Abstract: A microcomputer terminal system having a list mode of operation for the video refresh circuit. Stored in the main memory are list address pointers. Video circuits read a list address pointer at a designated location in the main memory. The list address pointer points the video circuits to the beginning of a list. The main memory stores the list. The list comprises control data, character count and a data address pointer. The data address pointer of the addressed list is read by the video circuits. By reading the data address pointer of the addressed list, the video circuits are pointed to the storage location of the main memory for the character data to be displayed on the video screen. On each refresh cycle of the video screen, the video circuits progress element-by-element through the list generating the display. The video circuits return to the beginning of the addressed list for the next refresh cycle.

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Other info:

Inventors: Lovercheck, Lawrence R. (Palo Alto, CA, US)

Application Number: 958714
Filing Date: 1978-11-08
Publication_date: 1980-05-13
Assignee: Zentec Corporation (Santa Clara, CA)
Primary Class(es): 345/471
Other Classes:
US Patent Ref:

3685038	Aug, 1972	Flanagan	340/799.
3685039	Aug, 1972	Flanagan	340/799.
3946407	Mar, 1976	Ishii et al.	340/799.
3972026	Jul, 1976	Waitman et al.	364/900.
4074254	Feb, 1978	Belser et al.	364/900.
4103331	Jul, 1978	Thacker	340/799.
4104624	Aug, 1978	Hamada	340/799.
4115765	Sep, 1978	Hartke	340/799.
4141003	Feb, 1979	Felsenstein	340/799.

Other Refs:
Primary Examiner: Trafton, David L.
Assistant Examiner:
Attorney: Wiseman; Jack M.