Display system having modified screen format or layout

Details Display system having modified screen format or layout Display system having modified screen format or layout

1979-03-27

1981-03-24

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340734, 340735, 340745, 340790, G06F 314

Patent

active

042583616

ABSTRACT:
A display system having a scanned CRT provides a full screen layout of alphanumeric characters and at least one additional screen layout, e.g. a split screen layout.
A refresh buffer stores data to be displayed in a first sequence of addresses so that when this data is read out by address generator in the first sequence a full screen layout results. A read only translation store may be selectively addressed by the first sequence of addresses to provide a modified sequence of translated addresses. When the refresh buffer is addressed by the sequence of translated addresses, a split screen layout of the data results. A selector is operable to address the refresh buffer with either the first sequence of addresses or the sequence of translated addresses.
Logic inhibits character display in a blank area between the two halves of the split screen. Attribute decode logic enables different attributes to control screen halves during split screen operation.
Read only store is preferably replaced by a read/write store when several alternative screen layouts are required. Each alternative screen layout requires a sequence of translated addresses to be supplied to the read/write store from a controller.

REFERENCES:
patent: 3428851 (1969-02-01), Greenblum
patent: 3777059 (1973-12-01), Wilkey, Jr.
patent: 3792462 (1974-02-01), Casey et al.
patent: 3973245 (1976-08-01), Belser
patent: 4075620 (1978-02-01), Passavant et al.
patent: 4112423 (1978-09-01), Bertolasi
patent: 4144405 (1979-03-01), Wakamatso
patent: 4146879 (1979-03-01), Nicholson et al.
IBM Tech. Discl. Bull.; vol. 18, #10; 3/76; pp. 3392-3396; Cummins, et al.; Display Refresh Mechanism Employing a Multisequented Buffer.

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