Buffering digitizer data in a first-in first-out memory

Details Buffering digitizer data in a first-in first-out memory Buffering digitizer data in a first-in first-out memory

1993-09-10

1995-10-03

Powell, Mark R.

395442, 395893, 395850, 395728, G06F 1500

Patent

active

054559073

ABSTRACT:
A computer system with a digitizer based screen display in which the digitizer data is buffered through a first-in first-out memory (FIFO). The processor is only interrupted when a full digitizer data packet is available in the FIFO, rather than being interrupted on each data byte available in the FIFO. The FIFO can hold multiple digitizer data packets, so that data is not lost should the processor in the computer system be unable to immediately handle these digitizer data packets. The system also provides a filter in a separate controller that examines each digitizer data packet to determine if the pen is in a predefined screen location that performs a prespecified function. If so, rather than pass the digitizer data packet to the system processor through the FIFO, the command is passed through a separate register to the processor based on the "hotspot" touched on the screen.

REFERENCES:
patent: 4730186 (1988-03-01), Koga et al.
patent: 5329615 (1994-07-01), Peaslee et al.
Peripheral Components 1992, "UPI-452 CHMOS Programmable I/O Processor," Intel Corporation (1991) pp. 5-113 to 5-165.

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