36879,255:(14);5"ŠǠ""UESTION: HAT IS ONE OF THE BIGGEST PROBLEMS WITH THE ?"("NSWER: 22 * 23 SCREENFORMAT."2"OLUTION: ŠǠ"< 9000F"ŠǠ"NP"HE FOLLOWING PROGRAM IS A UTILITY WHICH GIVES THE àA 25*30 SCREEN FORMAT."Z"T WORKS BY LOWERING THE POSITION OF THE 'S SCREEN IN MEMORYAND ALTERING";d" THE REGISTERS WHICH CONTROL THE START OF SCREEN (TOP & LEFT) "4n"AND THE SIZE OF THE SCREEN (ROWS & COLUMNS).?x 9000\"ŠǠ""O FAR SO GOOD, BUT THERE ARE A COUPLE OF FURTHER POINTS TO COVER.""IRSTLY, THE 'S SCREEN EDITOR THINKS THAT IT STILL HAS A 22 * 23";" SCREEN."a"ECONDLY, BECAUSE OF THIS THE NORMAL CLEAR SCREEN COMMAND WON'T WORK."l 9000"ŠǠ""O GET ROUND THE FIRSTPROBLEM YOU HAVE TO EVERY CHARACTER TO THE";" SCREEN."@"HE ROUTINE TO DO THISSTARTS AT LINE 2000. T USES THREE VARIABLES."u"$ CONTAINS THE STRING TO BE DISPLAYED"" & ARE THE & CO-ORDINATES OF WHERE THE STRING IS TO BE DISPLAYED." 9000"ŠǠ"G"HE ROUTINE STARTING AT LINE 1000 TRANSFERSTHE àINTO THE EXPANDED";]"-SCREEN STATE."""HE ROUTINE AT LINE 3000 TAKES CARE OF THESECOND PROBLEM.","ERE A MACHINE-CODE ROUTINE IS LOADED INTOTHE CASSETTE BUFFER.";36" HEN CALLED THIS ROUTINE CLEARS THE ENTIRE SCREEN AREA.">@ 9000[J"ŠǠ"T"HE ROUTINE IS SLOWER THAN NORMAL PRINTING, MAINLY BECAUSE OF THE AMOUNT";^" OF WORK THAT HAS TO BE DONE CONVERTING CODES";h"INTO EQUIVALENTS."Xr"F YOU WANT TO USE THEEXPANDED SCREEN IN YOUR OWN PROGRAMS "}s"FOLLOW THIS PROCEDURE:": 9000t"ŠǠ"u"RANSFER THE SUBROUTINES 1000, 2000& 3000, RENUMBERING IF"'v"NECESSARY.":" TO 3000 AT THE START OF THE PROGRAM."Yw"O TRANSFER TO LARGE SCREEN, 2000."x"O DISPLAY INFORMATIONPLACE IT IN $. ET AND EQUAL TO THE"y"POSITION WHERE YOU WANT IT DISPLAYED AND 1000."| 9000 "ŠǠ","ND NOW TO THE PROGRAM"7 9000G"";(142)R60000(#"Ӡ''ϠŒ"2# A$: A$"C" 9010<#`631,76:632,207:633,34a634,66:635,73:636,71b637,32:638,50i639,34:640,44:641,56:642,135j643,82:644,213:645,13Bt 198,15U~ 52,30:56,30[