Display Control Apparatus
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31
This article describes a display control apparatus which includes a scan code buffer and an all-points-addressable (APA) buffer. The APA buffer operates as a character generator for storing character patterns in text mode, and operates as a buffer for storing data bits supplied from a data source in APA mode. The scan code buffer stores character codes to access the character patterns in the APA buffer in the text mode, and stores control information to fetch the data bits from the APA buffer in the APA mode. Referring to Fig. 1, a scan code buffer 1, an attribute buffer 2, and an APA buffer 3 are divided into a plurality of small blocks. Each small block contains 32 x 32 bits in the APA mode. A microprocessor (not shown) controls the operation of the circuit blocks in Fig. 1.