HP 40gs HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010.p - Page 293
The Print commands, PRDISPLAY, PRHISTORY, PRVAR <variable>, PRVAR <variable>
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The Print commands These commands were supplied for use with the battery operated HP infra-red thermal printer that is designed for use with any of the 39g family. This printer was originally designed for the first calculator in this family, the hp 38g, released in 1995. Very few of them sold because it was far easier to simply use the connectivity software to capture screens and images and then just paste them into a document on the PC. At the time of writing I was unable to find any reference to it on the HP website and it may no longer be available. Because it uses the infra-red port the commands will not operate with the hp 40gs. There may be a brief display of the communications symbol, a small arrow, in the top right corner of the display but there will be no other result. PRDISPLAY If you place this command in a program then the current display will be sent to the infra-red printer. PRHISTORY This command, whether issued in the HOME view or in a program, will send the entire contents of the History to the infra-red printer. PRVAR This command, whether issued in the HOME view or in a program, will send the value of the variable to the infra-red printer. This can be used to capture and send images of graphs without need for programming as follows: • set up the graph or image as required • press ON+PLOT to capture the image and store it in grob G0 • in the HOME view, issue the command PRVAR G0. 293