Transparent addressing for CRT controller
AssigneeHoneywell Inc.
InventorsConrad Boisvert, William J. Greger
Life of this patent
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Abstract
A controller for a CRT is disclosed having processor terminals for connecting the controller to a processor, CRT terminals for connecting the controller to a CRT, a refresh address generator for generating refresh addresses so that a display on the CRT can be refreshed, an update address generator for generating update addresses so that information in a refresh memory can be updated, refresh memory terminals for connecting the update address generator and the refresh address generator to a refresh memory, and a control circuit for exclusively connecting the update address generator and the refresh address generator to the refresh memory terminals so that only one of the generators has control of the refresh memory at a time.
Claims37
A controller for cathode ray tubes comprising:
- processor terminal means for connecting said controller to a processor;
- CRT terminal means for connecting said controller to a cathode ray tube;
- refresh address generator means for generating refresh addresses to be connected to a refresh memory so that a display on the CRT can be refreshed;
- update address generator means for generating update addresses to the refresh memory so that information within the refresh memory can be updated;
- refresh memory terminal means for connecting the update address generator means and the refresh address generator means to the refresh memory;
- and,
- control means for exclusively connecting said update address generator means and said refresh address generator means to said refresh memory terminal means so that only one of said generator means has control of said refresh memory at a time.
A controller for cathode ray tubes (CRT) comprising:
- input terminal means for connecting said controller to a processor;
- cathode ray tube terminal means for connecting said controller to a cathode ray tube;
- refresh memory terminal means for connecting said controller to a refresh memory;
- address generator means connected to said input terminal means, to said cathode ray tube terminal means and to said refresh memory terminal means for generating update addresses to said refresh memory terminal means so that a refresh memory connected to said refresh memory terminal means can be updated with new information and for generating refresh addresses to said refresh memory terminal means so that a refresh memory connected to said refresh address terminal means can be addressed to refresh a display on a cathode ray tube connected to said cathode ray tube terminal means;
- and,
- control means connected to said address generator means for controlling said address generator means so that only one of said update address and said refresh address can be connected to said refresh memory terminal means at a time.
Dependencies are inferred from the claim text.