G - Physics – 09 – G
Patent
G - Physics
09
G
354/24, 354/236.
G09G 1/16 (2006.01) G01R 13/34 (2006.01)
Patent
CA 1304162
ABSTRACT OF THE DISCLOSURE A digital engine analyzer responsive to analog signals produced by an engine being analyzed for generating a display on a CRT screen of information in graphic and/or alphanumeric form by addressing a character ROM to read out character matrix data which defines characters to be displayed, the size of the characters displayed being presented in a double high-double wide format with the character video being generated by a 7 x 9 character matrix corresponding to 14 beam columns by 18 beam rows as stored in the character ROM but being read out as a 7 x 8 character matrix corresponding to 14 beam columns by 16 beam rows by addressing the data in the first and last rows of the character matrix for a single beam scan and addressing the intermediate rows of the character matrix for two consecutive bema scans whereby the number of character rows presented on the display screen is increased from 14 to 16 for a 256 beam row screen. Conventional alphanumeric characters are addressed using standard ASCII codes with inverse video provided by the use of complementary inverse video characters which are addressed using an expanded code, with each inverse character matrix being stored an integral number of memory locations away from corresponding standard character matrices. For presentation of information in graphic form, character blocks representing full and partial values of a full scale value for a variable to be displayed are stored in the character ROM, addressing of character blocks for creating a bar graph representation is carried out using parameters of the engine under test and the magnitude of the analog value to be displayed in generating address data for the character ROM, the bar graph being ?nstructed from one or more character blocks.
611847
Govekar Craig F.
Putrow Michael C.
Smart & Biggar
Snap-On Tools Corporation
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