Display mode switching system for flat panel display apparatus

Details Display mode switching system for flat panel display apparatus Display mode switching system for flat panel display apparatus

1988-06-17

1991-02-05

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

340789, 340798, 340799, 382 47, G09G 500

Patent

active

049909045

ABSTRACT:
An access to a CGA I/O port or an EGA I/O port by a CPU is detected by an NMI generator. The NMI generator then supplies an interrupt signal to the CPU. The CPU accesses an I/O monitor RAM, and detects the accessed I/O port. The CPU refers to a CGA/EGA display flag, and when the accessed I/O port is different from a display mode set in the flag, the CPU sets a display mode corresponding to the accessed I/O port in the CGA/EGA display flag. The CPU sets, in a display timing register, a display timing parameter corresponding to the display mode set in the flag.

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