How theprogram works

Thisprogrambeginsby assigninga numberof printercommandsto BASIC stringvariables(lines1000to 1070).Youcanfmdmostof thesecommands nearthe beginningof chapter7.

TheWIDTH“LPT1:“255 statementin line 1090meansintlnitelinewidth. It preventsthe IBM-PCfrom insertingunwantedcarriagereturnsand line feedsin graphicsdata.

Actualprintingbeginsin line 1100.Usingthe preassignedcommands,the pmgramprintssamplesofitsdiffemntfonts,followedbysarnplesoftheprint pitches,then somedoubleand quadruple-sizedprinting.

Next comes the central attractionof the program: a line of text printed fourteentimesinexpandingandcontractingloopsto giveabarreleffect.The woxicis doneby fourprintercommands:a commandsettingtherightmargin (line 1370);a centeringcommand(line 1390);a commandto vary theline spacing(l”mes1410and 1460);and a commandto micro-adjustthe space betweencharactem(lines 1420and 1470).

Nexttheprogramreturnsto normalspacingandgivesa demonstrationofthe printer’sword-processingabilities:italicprinting,bold printing,underlin- ing, subscripts,etc.

Therowofcarsymbolsinthenextprintedlineiscreatedbydownloadingtwo new characterpatterns, which are printed in place of the character“<” (character60). Detailscan be foundin Chapter8.

‘l%efinalpartoftheprogramusesdotgraphicstopnntsome “SW’’logos with variousdensities.

The dot pattern of the logo was originallylaid out on graph paper, then eonvertedtothedatainlines2400to2670withthehelpof a calculator.Each number~presentseightverticaldots.(See’’Graphicscommands”inChapter 7 for details.)

The patternis printedin four rows, each eightdots high and 65 dots wide. Lines 1770 to 1840 ~ad the dot data into a string array variablenamed LOGO$.Line 1850sets the line spacingto 8fl’2inch so that the rows will connectvertically.Theloopin lines 1860to 1940andlines 1960to 2040do the printingin four passesof the printhead.

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Star Micronics ZA-250, ZA-200 user manual How theprogram works

ZA-200, ZA-250 specifications

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