CLUB 100 LIBRARY - 415/939-1246 BBS, 937-5039 NEWSLETTER, 932-8856 VOICE 2/16/85 The CARTPT program is a quick way of reviewing data in the form x,y by plotting in Cartesian (rectangular) coordinates. The user is given a choice of LINEAR, LOG Y, LOG X, and LOG LOG scales (popular graphpaper formats). Data can be entered from the keyboard (normally used only for small quantities of data) or from a RAM file (containing only numerical data in the form x,y....x,y). The RAM file is preferrable becaues it allows the user to return and replot in different scale formats without re-entering data. Additionally, the RAM file can serve as a type of interface between this program and data generated by any other user program or even realtime data. When the program runs, it presents menus allowing selection of SCALES, INPUT TYPE, and whether data points are to be connected by a LINE. The program automatically scales the data to utilize the full screen size of the Model 100. Once the completed graph is displayed, hit [F1] to dump screen to a printer (7 bit graphics for RS LP VII, DMP100 or similar format) and/or hit [F2] to return to scale selection menu for different scales (this function is available for file entered data only). Notes: If the LINE option is selected, additional time is required for sorting values into sequence, so a delay will be noticed if there are many data points. Be careful about making CHANGES to the graphics driver inasmuch as altering Port calls can have undesirable side effects. Your computer will not be damaged, however a RESET (and loss of files in memory) may become necessary. If you need only to make simple changes to command codes sent to your printer to activate/deactivate graphics mode, however, there should be little danger. To make this program compatable with the 7 bit graphics driver only 63 of the 64 possible pixel rows have been used. If you feel that some data has been garbled in downloading the graphics driver section, it is advisable to get a second copy and compare. For additional information on ports (and many other useful items not discussed in the factory publications) I recommend "Hidden Powers of the TRS-80 Model 100" by Christopher L. Morgan (Plume/Waite Books) Jay Holovacs; 95 King George Rd.; Warren, NJ 07060