Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Computer system having a bridge between two buses with a direct memory access controller and an alternative memory access controller










Image Number 3 for United States Patent #5621902.

A computer system having a peripheral controller interconnect (PCI) bus and an industry standard architecture (ISA), with ISA compatible devices coupled to the ISA bus, is provided with a first bridge coupled between the PCI and ISA buses. The first bridge has a first direct memory access (DMA) control circuit for controlling DMA transfers with the ISA devices. In order to achieve expanded compatibility with other types of devices, the system is also provided with an expansion bus, such as a Microchannel bus, with Microchannel compatible devices coupled to the Microchannel bus. A second bridge is coupled between the PCI and the Microchannel buses. This second bridge has a second DMA control circuit that controls DMA transfers with the ISA devices and with the Microchannel devices. Software disables the first DMA control circuit such that only the second DMA control circuit controls DMA transfers within the computer system.








 
 
  Recently Added Patents
Segmenting video based on timestamps in comments
Mitigating single point failure of devices in an analyte monitoring system and methods thereof
Organic light emitting display device and method of manufacturing the same
System and method to assess and report the health of landing gear related components
Carbonate and carbamate modified forms of glucocorticoids in combination with .beta..sub.2 adrenergic agonists
Silicone hydrogel, lens for eye and contact lens
Security arrangements for extended USB protocol stack of a USB host system
  Randomly Featured Patents
Transdermal therapeutic system comprising a reservoir-type pressure-sensitive adhesive layer and a back layer with uni-directional resilience
Method and related blowing model for drying and synchronously ironing out clothing by using a blowing model
Process for preparing glycopeptide derivatives
Locomotive sanitation apparatus and method of protecting the same from freezing
Regulable gene expression in gram-positive bacteria
Welder for metal rolling system, metal rolling system, and metal rolling method
Oscilloscope with dynamic triggering determination
Heat shield for an iron
Lamp system
Transmitter for wireless switch and dimmer