Display control system for determining connection of optional di

Details Display control system for determining connection of optional di Display control system for determining connection of optional di

1994-12-28

1996-01-30

Hjerpe, Richard

Computer graphics processing and selective visual display system

Plural display systems

Tiling or modular adjacent displays

345133, 345186, G09G 500

Patent

active

054883849

ABSTRACT:
In a computer system having a flat panel as standard equipment and allowing a CRT as an optional unit to be connected thereto, first test data common to R, G, and B in all the palettes in a RAMDAC, and each of the R, G, and B display signal levels output from the RAMDAC is compared with a reference level to determine whether a color CRT is connected. Furthermore, in all the palettes in the RAMDAC, the same data as the first test data is written for G, and data smaller than the first test data is written for R and B, and each of the R, G, and B display signal levels output from the RAMDAC is compared with the reference level to determine whether a monochrome CRT is connected.

REFERENCES:
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patent: 5138305 (1992-08-01), Tomiyasu
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patent: 5159683 (1992-10-01), Lvovsky et al.
Bt471/476/478, Graphics and Imaging Product Databook 1991, pp. 4-371-4-394.
PEGA 2 Users' Guide, Paradise Systems, Inc., Users' Guide 50208, Rev. 4, pp. 1-60.

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