公开(公告)号：US06434688B1

公开(公告)日：2002-08-13

申请号：US08530617

申请日：1995-09-20

申请人： William Desi Rhoden ,  Rajeev Jayavant

发明人： William Desi Rhoden ,  Rajeev Jayavant

IPC分类号： G06F1500

CPC分类号： G06F12/0223 ,  G06F12/02

摘要： The present invention provides a low-cost computer system which includes a single sharable block of memory that can be independently accessible as graphics memory or main store system memory without performance degradation. Because the “appetite” for main system memory (unlike that of a display memory) is difficult to satisfy, the memory can be addressed by reallocating an unused portion of a display memory for system memory use. Reallocation of the unused display memory alleviates any need to oversize the display memory, yet realizes the cost effectiveness of using readily available memory sizes. Further, reallocation of the graphics memory avoids any need to separately consider both the system memory and the display memory in accommodating worst case operational requirements. In accordance with additional embodiments, improved efficiency of operation can be achieved to enhance concurrency between plural banks of memory when expansion memory is included. The addressable locations of the expansion memory can be mapped to the bottom of the available system address space, and addressable locations of any prior base system memory are moved above the expansion memory space.

摘要翻译： 本发明提供了一种低成本计算机系统，其包括单个共享存储器块，其可以作为图形存储器或主存储系统存储器独立地访问，而不会降低性能。 由于主系统存储器（与显示存储器不同）的“胃口”难以满足，所以可以通过重新分配用于系统存储器使用的显示存储器的未使用部分来解决存储器。 未使用的显示存储器的重新分配减轻了对显示存储器进行超大尺寸的任何需求，但是实现了使用容易获得的存储器大小的成本效益。 此外，重新分配图形存储器避免了在适应最坏情况操作要求时单独考虑系统存储器和显示存储器的任何需要。 根据另外的实施例，当包括扩展存储器时，可以实现提高的操作效率以增强多组存储器之间的并发性。 扩展存储器的可寻址位置可以被映射到可用系统地址空间的底部，并且任何先前的基本系统存储器的寻址位置移动到扩展存储器空间之上。

公开(公告)号：US5642136A

公开(公告)日：1997-06-24

申请号：US661404

申请日：1996-06-07

申请人： Rajeev Jayavant ,  William Desi Rhoden

发明人： Rajeev Jayavant ,  William Desi Rhoden

IPC分类号： G09G5/24 ,  G09G5/36 ,  G09G5/39

CPC分类号： G09G5/24 ,  G09G5/363

摘要： In a text mode of a display controller, for each character of the text, a plurality of multiple-byte words are stored in a memory buffer. Each multiple-byte word contains an ASCII character code for the character, font attribute information for the character and at least one font line for the character. For each character font line to be displayed on the monitor, a multiple byte word is read. The attribute information and a first character font line are extracted from the multiple byte word. The display controller then constructs a character scan line for the character based on the attribute information and the first character font line. The character scan line may then be displaying on the monitor.

摘要翻译： 在显示控制器的文本模式中，对于文本的每个字符，多个多字节字被存储在存储器缓冲器中。 每个多字节字包含字符的ASCII字符代码，字符的字体属性信息和字符的至少一个字体行。 对于要在监视器上显示的每个字符字体行，读取多字节字。 从多字节字提取属性信息和第一字符字体行。 然后，显示控制器基于属性信息和第一字符字体行构建字符的字符扫描线。 然后，字符扫描线可以在监视器上显示。

公开(公告)号：US5659715A

公开(公告)日：1997-08-19

申请号：US646555

申请日：1996-05-08

申请人： Shih-Ho Wu ,  William Desi Rhoden ,  Mike Nakahara

发明人： Shih-Ho Wu ,  William Desi Rhoden ,  Mike Nakahara

IPC分类号： G06F13/18 ,  G09G5/36 ,  G09G5/39 ,  G06F12/00

CPC分类号： G09G5/39 ,  G06F13/18 ,  G09G2360/125 ,  G09G5/363

摘要： A low-cost, moderate performance small computer system is provided by allowing a single sharable block of memory to be independently accessible as graphics or main store memory. Allocation of the memory is selected programmably, eliminating the need to have the maximum memory size for each block simultaneously. Performance penalties are minimized by dynamically allocating the memory bandwidth on demand rather than through fixed time slices. A reallocatable memory subsystem enables transparent transfer of memory function of a lower-performance memory such as DRAM to occur in conjunction with a memory upgrade to a higher-performance memory such as VRAM, for example.

摘要翻译： 通过允许单个可共享存储器块作为图形或主存储器独立地访问来提供低成本，中等性能的小型计算机系统。 可编程选择存储器的分配，消除了对于每个块同时具有最大存储器大小的需要。 通过根据需要而不是通过固定的时间片动态分配存储器带宽来最小化性能惩罚。 一个可重新分配的存储器子系统能够实现诸如DRAM之类的低性能存储器的存储器功能的透明传输，例如结合存储器升级到诸如VRAM等更高性能的存储器。