Self-configuring memory management system with on card circuitry for non-contentious allocation of reserved memory space among expansion cards
US4905182A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 13, 1987 |
| Grant date | Feb 27, 1990 |
| Priority date | — |
| Expiry date | Mar 13, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F13/4217
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A printed circuit board card adapted to fit into a slot and make electrical connections with cooperating terminals in the slot, the slot being disposed on the main circuit board of a personal computer system, the main circuit board including a CPU, memory, a 32-bit address bus with control signals associated therewith, and input/output circuitry. The slot is coupled to the 32-bit address bus, being substantially a NUBUS bus, and the slot includes distinct identification line means which provide the slot with an identification number (distinct number) in the computer system. The card includes a decoder means which is coupled to the slot to receive the identification number; the decoder means has memory reservation means which causes 256 megabytes of memory space to be reserved for the card in the slot, such that, where the slot number is X, the 256 megabytes of reserved memory space begins at location $X000 0000 and ends at locations $XFFF FFFF.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.