May June 1980 - Commodore Computers

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MAY/JUNE. I <strong>1980</strong>. ISSUE 4. COMPUTE. 111 Ill CHEEP PRINT Hard Copy For Soft CHEEP PRINT SOFTWARE Cheep Print for PET is written mostly in BASIC; a little bit of machine code is used to BASIC; a little bit of machine code is used to insure accuracy in timing the output signals. I have chosen to put the machine code in the second cassette buffer, but the code is completely relocatable and may, for instance, be placed in high memory if you change the top-of-memory pointer and command CLR before trying to run the program (neglecting CLR causes trying to run the program (neglecting CLR causes strings to overwrite the machine code; you can guess how I found thiss out.) The BASIC part of Cheep Print is designed to live at the beginning of some other program, which I[ will refer to as the host program, and serves both to list the host program while it is under development and as data output software after the program has been completed. The host program is assumed to have line numbers of 100 and up. I have tried to structure Cheep Print so that it contains subroutines that can be called by the host program. . If you look over the listing of Cheep Print, which was produced by Cheep Print itself-- the comments were added afterwards for documentation -- you will see that most of the program is taken up with formatting the output for the printer, and with the details of listing a program. To use Cheep Print, start by making a master copy of the program that contains all the options that you might ever need; this copy should be saved for future use. Then make a sub-master that has the various parameters and options for the printer that you will be using most. You can simply load the master and delete those options that aren't needed, incidentally gaining more space for the host program. You will probably want to use Cheep Print to list itself a few times, just to make sure that the formatting is satisfactory, and to gain familiarity with the sequence of operations required. When you are about to start developing a new program, enter the sub-master copy of Cheep Print and then key in the host program. As you save your host program, Cheep Print will come along with it. Line 1 of Cheep print is a GOTO to the entry point of your host program, so that a simple RUN command will execute the host program. If you want a listing of any part of the program, m , simply command RUN 10; you will be prompted to check that your cassette recorder is properly set up -- — cables connected and running in record mode -- ~ and then you will be asked which lines you want listed. The options are the same as for the screen listing on PET: hit RETURNRN only, and gett everything; enter A-B B (a hyphen must be used as a separator here) and you get lines A through B inclusive; A- gives everything from Cost Cos! C A McCorlhy McCarthy 1359 W Idaho Ave SI St Poul. Paul. MN 55108 A onwards, B- gives everything up through B; and A alone, with no hyphen, lists the single line A. As the program listing proceeds, the line that is currently being processed for the Cheep Print output is listed at the top of the screen. When the message "BREAK IN 80" appears, the listing is done and you can turn off the recorder. One of the Cheep Print listing options is to put One of the Cheep Print listing options is to put each statement on its own private print line, thus leaving much welcome space for comments. I have used this style for the listing of Cheep Print; I hope that the comments on this listing suffice to explain what is going on, , and how to structure the various options for your specific needs. There is, however, one point that must be emphasized. The LIST instruction of line 2 needs to have precisely five characters as argument. The first time that you enter Cheep Print from the keyboard, key in something like 2 LIST LIST- LINES or 2 LIST12345. This is important because eventually line numbers are going to be POKED here by the commands of line 19; we need to leave enough room for the longest possible line numbers of five digits. The other principal subroutines of Cheep Print, which the host program may find useful, are: which the host program may find useful, are: 3-4 contains identification information such as the name of the program, date, revision, etc.; I have found this useful also when SAVEing or VERIFYing a program with PET's internal cassette recorder. The command LIST 3 puts this data on the screen, then I type the word ""SAVE" and two spaces over the line number and S$-; hit RETURN, and the program gets saved with a title, without the fuss of entering the title by hand. 7 outputs the string PS, P$, and 8 outputs the single character which has ASCII code P. 39 effects a carriage return and linefeed, and updates the variables PX and PY which give the current print position at the printer. 40-41 checks whether it's time for the printer to go to the next page, and if so, it executes 42-44. 42 linefeeds to the end of the current page, 43 is an option, useful for continuous roll paper; if the initial "RETURN" is deleted, a line of hyphens if the initial "RETURN" is deleted, a line of hyphens is printed at regular intervals, so your paper can be cut neatly into single sheets of uniform size. With fan-fold paper, line 43 may be ignored. 44 linefeeds to the top margin of where you want to start printing on the paper. 45-49 format the string S$ for output: space from the left edge of the paper to the left margin, print SS S$ if it fits on the current line; if it doesn't fit, output as much as does fit, , aand then repeat the process with the portion of SS S$ that's left over. 70 is a general purpose start-up routine. It calls 70 is a general purpose start-up routine. It calls
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MAY / JUNE 1980 ISSUE 4. $2.00 MAY/
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May June 1980 - Commodore Computers

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