þþ· d6X* ATARI 1050 DISK DRIVE OPERATING SYSTEM -- part 5nX*xX* command $24‚1X* on flag = 0 check rotation time of disketteŒ"X* otherwise, check motor speed–X* '‡TTRK201 †TMOTON;motor on, if neededªQ>´ P†SEKBUF¾P†SEKBUFÈQ†TSTRNG;move test bytesÒP„ALEN;to address lengthÜQ†TSTRNGæP…ACRC1;and CRCðQ†TSTRNGú P…ACRC2 Q„FLAG%FˆTTRK2011;check on 0 actual trackR>" HˆTTRK2012,!…MOTHL;on 1 motor speed6X*@ˆTTRK2012Q…ERRORJL>€;indicate errorT P…ERROR^HˆTTRK2013;br alwayshˆTTRK2014Q…ERRORrM>;indicate no error| P…ERROR†"ˆTTRK2013Q>Ð;interrupt command P†FCNTRLš …QUITT;return 'C' or 'E'¤*!†SNDSEK;return sector with error table®X*¸!ˆTTRK2011 …WSONE;read sector 1ÂEˆTTRK2012;br if not presentÌ …SPEED;check rotation timeÖEˆTTRK2012;errorà!ˆTTRK2014;no errorêX*ôX* check motor speedþX*…MOTHLQ>;goto track 20 P…TRACK „SEEK& †MOTOFF;motor off0$>2: †DELAY2;wait until quietDQƒDRANM>;motor onXPƒDRAb$Q>À;'read address' to controllerl P†FCNTRLv)$>†ATRACK;destination address for data€†MOTHL1Q>ŠP‡TIM1024;set timer”†MOTHL2*ƒDRAž G†MOTHL3;DRQ from controller?¨*†T1024I;timeout?² I†MOTHL2¼#†SEKBUF;incr. time counterÆ H†MOTHL1Ð#†SEKBUFÚ H†MOTHL1äQ…TIM64;reset timerî&!ˆTTRK2012;overflow, takes too longø†MOTHL4*ƒDRA;DRQ? I†MOTHL4 !†MOTHL3Q†DATREG;read data byteP†SEKBUF9;and store it 2* I†MOTHL44Q>>,†MOTHL5*†FCNTRL;wait for controller readyH H†MOTHL5R Q†ATRACK\R>;track 20?fF†MOTHL6;br if sop7†MOTHL7Q>À;'read address' again, motor not on speedz P†FCNTRL„$>†ATRACK;dest. addr., againŽH†MOTHL2;do it again˜X*¢†MOTHL6Q†FCNTRL¬H†MOTHL7;error, try again¶‡MOTTHL8*†T1024IÀI‡MOTTHL8;wait for timeoutÊQ…TIM64;reset timerÔ!ˆTTRK2014;doneÞX*èX* wait for sector 1òX*ü…WSONEQ>;sector 1 P†SEKREG Q†DATREGQ>‚;READ SECTOR$ P†FCNTRL.Q>æ;set timeout8 ‡TIMEOUTB†SWONE1*ƒDRA;wait for DRQLJ†WSONE2;IRQ, errorV I†SWONE1`Q…TIM64;reset timerjQ†DATREG;get data bytet …FORCE;interrupt command~ Q†DATREGˆ ,;done’:œ†WSONE2;;error¦:°X*º X* check time of one rotationÄX*Î…SPEEDQ>;sector 1Ø P†SEKREGâ Q>‚;readì P†FCNTRLö%> †DELAY3;delay †SPEED1*ƒDRA;data? G†SPEED2%> ;no, delay( †DELAY324<4F4P4Z#†SEKBUF;time count + 1d H†SPEED1n#†SEKBUFx H†SPEED1‚#;;error, overflow, diskette jamsŒ:–†SPEED2,;ok  †SPEED3:ªX*´X* break routine¾'X* fatal errors of floppy comes hereÈX*Ò"…BREAK …FORCE;interrupt commandÜQ><æLƒDRB;reset PORT BðPƒDRBú!…TFAIL;motor on/offX*& ª=ª=ª=ª=ª=ª=ª=ª=ª;fillersX*"X* jump table for commands,'X* -- R, P, W, S, $21, $22, $23, $246X*@*†JMPTBL 4„READ=4…WRITE=4†VWRITE=4…RSTATJ$ 4…SFORM=4…DFORM=4„TEST=4‡TTRK201T*†JMPTBH 5„READ=5…WRITE=5†VWRITE=5…RSTAT^$ 5…SFORM=5…DFORM=5„TEST=5‡TTRK201h& ª=ª=ª=ª=ª=ª=ª=ª=ª;fillersr†TSTRNG K==;test bytes|X*† X* vectorsX*š …START;reset vector¤ …BREAK