Method and apparatus for synchronizing data in a host memory wit

Details Method and apparatus for synchronizing data in a host memory wit Method and apparatus for synchronizing data in a host memory wit

1995-06-07

1997-10-21

Chan, Eddie P.

395500, 395468, 395471, 395472, 395473, 39520008, 39520019, 395492, 395704, 395427, G06F 1100, G06F 1200, G06F 1520

Patent

active

056805420

ABSTRACT:
A copy of data in a Host Computer is synchronized with a version located in Shared Memory in a Modular Development System (MDS). Whenever a change in one or more bits in a Line of Data in Shared Memory are detected, a MDS Line Dirty Flag is checked. If the Flag is not set, it is set and a message is sent to the Host Computer that the Line of Data is now dirty. Whenever the Host Computer receives this message for a Line of Data in its visible memory, it sends a request to the MDS to read that Line from Shared Memory and send it to the Host. Otherwise, a Host Line Dirty Flag is set. The Host Computer also sends a request to read a Line of Data when that Line of Data is scrolled onto a screen and the corresponding Host Line Dirty Flag is set.

REFERENCES:
patent: 4466098 (1984-08-01), Southard
patent: 5155824 (1992-10-01), Edenfield et al.
patent: 5371878 (1994-12-01), Coker

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