The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 1995
Filed:
May. 11, 1993
Eric W Schieve, Austin, TX (US);
Dell USA, L.P., Austin, TX (US);
Abstract
Disclosed are an apparatus and method for testing a direct memory access ('DMA') controller. The apparatus comprises (1) a virtual control device including a virtual control latch, the virtual control device coupled to a request input of the DMA controller and capable of transmitting a signal to the DMA controller representing a request to transfer data and (2) a virtual input/output ('I/O') device including a virtual I/O latch, an acknowledgement output of the DMA controller coupled to the virtual I/O device, the virtual I/O latch capable of storing the data for use by the DMA controller. In its preferred embodiment, the present invention operates within the confines of IBM-compatible personal computer architecture, allowing DMA controller functionality to be tested directly.