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All-Points-Addressable Buffer With Attributes

IP.com Disclosure Number: IPCOM000061059D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Asano, H: AUTHOR [+2]

Abstract

The memory units operate as an all-points-addressable buffer for storing image data displayed on a display surface. Attributes for controlling each image data block, for example, 8x1 bits, in the all-points- addressable buffer are stored in areas of the memory units which are not occupied by the image data. As the all-points addressable buffer for a display surface of 880 x 1200 dots, six DRAMs (Dynamic Random-Access Memories) are required. 880 bits of the DRAM correspond to the 880 dots on the display surface, respectively, as shown in Fig.1. That is, the 880 bits of the DRAM are used in the all-points-addressable buffer, and the 110 bits are assigned for attributes. The attribute at a one-bit position controls one image block of 8 x 1 dots. Fig. 2 shows the display surface 1 divided in to three display areas A, B and C.

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All-Points-Addressable Buffer With Attributes

The memory units operate as an all-points-addressable buffer for storing image data displayed on a display surface. Attributes for controlling each image data block, for example, 8x1 bits, in the all-points- addressable buffer are stored in areas of the memory units which are not occupied by the image data. As the all- points addressable buffer for a display surface of 880 x 1200 dots, six DRAMs (Dynamic Random-Access Memories) are required. 880 bits of the DRAM correspond to the 880 dots on the display surface, respectively, as shown in Fig.1. That is, the 880 bits of the DRAM are used in the all-points-addressable buffer, and the 110 bits are assigned for attributes. The attribute at a one-bit position controls one image block of 8 x 1 dots. Fig. 2 shows the display surface 1 divided in to three display areas A, B and C. Three memory units 2, 3 and 4, each of which comprised two DRAMs, are assigned for the display areas A, B and C, respectively. The 880 bits of the memory unit 2 store the image of the display area A and the 110 bits store the attributes of the display area C. The 880 bits of the memory unit 3 store the image of the display area B, and the 110 bits store the attributes of the display area A. The 880 bits of the memory unit 4 store the image of the display area C, and the 110 bits store the attributes of the display area B. When the display area A is displayed, the image blocks 00, 01,
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