Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1986-08-26
1987-10-27
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315365, 315367, 340723, H01J 2970, H01J 2972
Patent
active
047032308
ABSTRACT:
In a graphic display apparatus having a digital differential analyzer (DDA), a chrominance data stored in a register is written in an area of a bit map memory defined by coordinates generated from DDA by a write control circuit in response to ARDY signal. A first flip-flop is reset by a busy signal from the write control circuit and is set by a load signal. When the first flip-flop is in a reset state, a first gate produces PRDY signal requesting a microprocessor to load the chrominance data in the register in response to RDY signal indicating completion of a coordinate setting operation from DDA. When the first flip-flop is in a set state, a second gate generates CRDY signal in response to RDY signal. CRDY and RDY signals are supplied to a selector which selects one of them due to a second flip-flop for switching a line processing mode and a raster operation mode, and supplies the selected signal to the write control circuit to thereby perform write operation.
REFERENCES:
patent: 4586037 (1986-04-01), Rosener et al.
Blum Theodore M.
Kabushiki Kaisha Toshiba
LandOfFree
Raster operation circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Raster operation circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Raster operation circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1273806