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00001A50: 53 A0 43 4F 4D 50 4C 45  54 45 44 2E 20 D0 4C 45  |S.COMPLETED. .LE|
00001A60: 41 53 45 20 A0 48 41 56  45 A0 4F 4E 45 A0 41 56  |ASE .HAVE.ONE.AV|
00001A70: 41 49 4C 41 42 4C 45 2E  22 3A 8D 31 33 35 30 00  |AILABLE.":.1350.|
00001A80: B8 1E 28 05 9C 3A 99 22  93 11 11 11 11 11 11 11  |..(..:."........|
00001A90: 11 11 11 1D 1D 1D 1D 12  20 44 45 4D 4F 4E 53 54  |........ DEMONST|
00001AA0: 52 41 54 49 4F 4E A0 50  52 4F 47 52 41 4D A0 4C  |RATION.PROGRAM.L|
00001AB0: 4F 41 44 49 4E 47 20 92  22 00 EC 1E 32 05 8B C2  |OADING ."...2...|
00001AC0: 28 34 35 30 35 38 29 B2  31 38 30 A7 3A 24 58 2C  |(45058).180.:$X,|
00001AD0: C2 28 34 35 30 35 31 29  AB 34 38 2C 22 46 49 4C  |.(45051).48,"FIL|
00001AE0: 49 4E 47 20 33 20 20 20  30 30 54 30 31 00 F4 1E  |ING 3   00T01...|
00001AF0: 3C 05 93 3A 80 00 3A 1F  46 05 99 22 13 1D 1D 1D  |<..:..:.F.."....|
00001B00: 11 11 11 11 11 11 11 11  11 11 11 11 11 11 11 11  |................|
00001B10: 11 11 11 11 11 11 11 12  20 50 52 45 53 53 A0 54  |........ PRESS.T|
00001B20: 48 45 A0 53 50 41 43 45  A0 4B 45 59 A0 54 4F A0  |HE.SPACE.KEY.TO.|
00001B30: 43 4F 4E 54 49 4E 55 45  20 92 22 00 49 1F 50 05  |CONTINUE .".I.P.|
00001B40: 92 35 39 34 31 30 2C 34  2C 34 00 5D 1F 5A 05 81  |.59410,4,4.].Z..|
00001B50: 42 B2 31 A4 33 30 3A A1  41 24 3A 82 3A 8E 00 00  |B.1.30:.A$:.:...|

....D..:.59468,14.[.N..".WITH THE HOPE T
HAT THE SHORT BREAK WAS  WELCOME, LET'S 
CONTINUE ";...X.."WITH THIS PET-  SOFT T
UTORIAL.":.".YOU'LL ";.Z...."REMEMBER TH
AT WE WERE EXAMINING  THE VARIOUS STATEM
ENTS WITH WHICH ";.&...."YOU   NEED TO B
E FAMILIAR, AND WE HAD JUST    LOOKED AT
 PRINT# - A ";.F...."STATEMENT WHICH    
PRINTS DATA ON TO TAPE, RATHER THAN ";..
. .."THE DISPLAY.":.".THE NEXT INSTRUCTI
ON WE MUST LEARN ";......"IS   GET# (DON
'T FORGET THE #). GET# WILL    CAUSE 1 C
HARACTER AT ";.6...."A TIME TO BE READ  
FROM A DATA TAPE. THERE IS NO LIMIT TO  
THE ";......"NUMBER OF CHARACTERS WHICH 
CAN BE   'GOT' IN THIS WAY (UNLIKE THE "
;...H.."'79 LIMIT'FOR PRINT#).":.".THERE
'S ";...R.."ONE MORE INSTRUCTION FOR US 
TO  LOOK AT: (ST)."......1350.-....".(ST
) IS SIMPLY A PROGRAM DEVICE TO TEST THE
 CONDITION ";.P...."OF A FILE.":.".IF (S
T) IS EQUAL TO 64, THEN AN EOF (ENDOF ";
......"FILE) HAS BEEN SENSED. IF (ST) EQ
UALS128, THEN AN EOT (END OF ";......"TA
PE) HAS BEEN SENSED. YOU'LL HAVE GATHERE
D, ";.4...."INCIDENT- ALLY, THAT (ST) MU
ST APPEAR IN BRACKETS (AS IT DOES ";.`..
.."HERE) WHEN YOU USE IT IN A  PROGRAM."
..."..".WITH (ST), ANY VALUE OTHER THAN 
64 OR   128 IS A FAULT AND, ";...,.."TO 
AVOID 'CRASHES', YOUR PROGRAMS SHOULD AL
WAYS TEST ";.+.6.."FOR    SUCH A POSSIBI
LITY.":.".THE TEST STATEMENTS ARE FAIRLY
 ";.P.@.."STRAIGHT-FORWARD (BUT YOU MIGH
T LIKE TO NOTE THEMDOWN), AND ";...J.."W
E'LL LOOK AT THEM NEXT.":.1350...T..".TO
 TEST FOR SPECIFIC CONDITIONS IN PRO- GR
AMS, WE USE (ST) ";...^.."TOGETHER WITH 
THE ANDSTATEMENT, AND TWO SPECIAL NUMBER
S.".F.H..".TO TEST FOR EOF, WE SAY 'IF (
ST) ";...R.."AND 64 THEN GOTO (THE LINE 
NUMBER OF THE CLOSE STATEMENT)'.".E.|.."
.TO TEST FOR EOT, WE SAY 'IF (ST) AND 12
8THEN GOTO ";......"(THE LINE NUMBER OF 
THE CLOSE STATEMENT)'.":.".THE NUMBERS "
;.S...."REPRESENT THE 'BITS' SET IN PET'
S MEMORY - DON'T WORRY ABOUT THEM.".....
.".THE BEST WAY TO TEST FOR ANY ERROR TH
AT COULD PRODUCE ";......"A 'CRASH' IS T
O SAY 'IF   (ST) > 0 THEN GOTO (THE LINE
 NUMBER OF ";......" THE CLOSE STATEMENT
)'. IN TESTING FOR   ALL (ST) ";._...."C
ONDITIONS, THIS AUTOMATICALLY CLOSES THE
 FILE IF (ST) VARIES ";...B.."FROM '0',N
O MATTER WHAT THE CAUSE.":.1350.W.L..".Y
OU ARE NOW VERY NEAR THE POINT AT WHICHY
OU CAN TRY USING THE ";...V.."FILE SYSTE
M FOR   YOURSELF. THERE ARE, HOWEVER, SO
ME SOFT-WARE ";.`...."PROGRAM 'PATCHES' 
YOU SHOULD KNOW  ABOUT, TO HELP AVOID ";
......"ERRORS.":.".THE FIRST IS USED WHE
N RUNNING ";......"PRINT#   FILES IN WHI
CH THE OPEN STATEMENT HAS   CONCLUDED WI
TH ";......"A 1 OR 2 (THUS CALLING   EIT
HER AN EOF OR AN EOT). ";.C...."THE PATC
H     MAKES SURE THAT PET KNOWS WHERE IT
S TAPEBUFFER IS, ";......"BY USING POKE.
":.".YOU SHOULD NOTE THAT THIS ";......"
IS FOR PRINT# FILES ONLY, SINCE IT'S IMP
OSSIBLE TO    HAVE ";.%.&.."BOTH PRINT# 
AND INPUT# (OR PRINT#  AND GET#) OPERATI
ONS AT THE ";.D.0.."SAME TIME   WITHIN T
HE SAME FILE.":.".YOU'LL FIND THE ";...:
.."PATCH FULLY DESCRIBED ONTHE NEXT PAGE
.":.1350.W.D..".ON THE PREVIOUS PAGE, WE
 SAID THAT HERE WE'D LAY OUT ";...N.."TH
E FIRST OF OUR SOFTWARE  PATCHES. AS WE 
NOTED, IT'S ";.P.X.."INTENDED TO  TELL P
ET WHERE THE TAPE #1 BUFFER IS."...B..".
IT'S ACHIEVED LIKE THIS. IMMEDIATELY BE-
FORE AN OPEN COMMAND, ";.M.L.."INCLUDE T
HE LINE:":."......POKE 243,122:POKE";...
V.." 244,2":.".SHOULD YOU BE USING A SEC
OND TAPE UNIT  (TAPE #2), ";.R...."THEN 
THE LINE BECOMES:":."......POKE 243,58:P
OKE 244,3"......".THE GAP BETWEEN POKE A
ND THE NUMBERS CANBE REMOVED IN YOUR ";.
....."PROGRAM, OF COURSE.  IT'S ONLY BEE
N USED IN THE EXAMPLES TO  HELP ";.'....
"MAKE THEM CLEAR. REMEMBER, INCLUDE EITH
ER OR BOTH LINES, AS ";.V...."APPROPRIAT
E,   IMMEDIATELY BEFORE OPEN.".`....1350
......".THE SECOND PATCH IS A SMALL SUBR
OUTINE  WHICH SHOULD ";...F.."BE CALLED 
AFTER ALL PRINT# STATEMENTS. CALL IT IN 
THE NORMAL ";.).P.."WAY   WITH GOSUB AND
, OF COURSE, CHANGE THE   LINE NUMBERS "
;.J.Z.."IN THE LISTING BELOW TO    FIT Y
OUR PROGRAM.":.".A FULL ";......"EXPLANA
TION OF THE WAY IN WHICH  IT WORKS IS SO
MEWHAT ";......"OUTSIDE THE SCOPE  OF TH
IS TUTORIAL, AND INDEED OF THE AV- AIL";
.;...."ABLE PET MEMORY! USING IT WILL, H
OW- EVER, MAKE TROUBLE-FREE FILE ";.L...
."OPERATION  EVEN MORE CERTAIN. HERE IT 
IS:"......"...2000 IF PEEK(625)>180THEN2
020......"..2010 RETURN.F. .."..2020 POK
E59411,53:T=TI...*.."..2030 IFTI-T<6THEN
2030...4.."..2040 POKE59411,61:RETURN.7.
>..".THIS SUBROUTINE IS FOR TAPE #1. CHA
NGES ";.F.H.."FOR TAPE #2 ARE SHOWN ON T
HE NEXT PAGE.".P.R..1350...\..".THE SUBR
OUTINE NEEDS SOME SMALL CHANGES IF IT'S 
TO B.  USED ";...F.."WITH TAPE #2. FIRST
, HERE'S THE SUBROUTINE AGAIN:"...P.."..
.2000 IF PEEK(625)>180THEN2020.).Z.."..2
010 RETURN.H...."..2020 POKE59411,53:T=T
I.F...."..2030 IFTI-T<6THEN2030......"..
2040 POKE59411,61:RETURN......".FOR USE 
WITH TAPE #2, IT WILL LOOK LIKE THIS:"..
...."..*2000 IF PEEK(626)>180THEN2020...
..."..2010 RETURN......".*2020 POKE59456
,207:T=TI.6.J.."..2030 IFTI-T<6THEN2030.
X.T..".*2040 POKE59456,223:RETURN......"
.THE THREE CHANGED LINES ARE HAVE BEEN  
 ASTERISKED.";.S...."THE NEXT PAGE HAS A
 BRIEF    NOTE OF THE IDEA BEHIND ";....
.."PEEK/POKE       COMMANDS."......1350.
B....".FIRST, WHY THE POKE COMMANDS IN B
OTH THESOFTWARE PATCHES? ";.~...."EXPERI
ENCE HAS SHOWN  THAT MANY TAPE FILE PROB
LEMS ";.G...."HA.E CENT- RED ON THE STAR
T-UP OF THE CASSETTE UNITDRIVE MOTOR. ";
...$.."AVOIDING TECHNICALITIES,   THE PA
TCHES OVERCOME THESE BY PUT";.L...."TING
   THE DRIVE UNDER PROGRAM CONTROL.":.".
SIMILARLY, ";...8.."THE PEEK COMMAND EXA
MINES THETAPE BUFFER, AND ALSO CONTROLS 
THE ";.Q.B.."DRIVEMOTOR AT THE CORRECT P
OINTS, TO MINIMISEERRORS."...L..".A COMP
LETE SAMPLE FILE PROGRAM, CONTAIN-ING AL
L THE ";.I.V.."SAFETY FEATURES AND PATCH
ES DESCRIBED, FORMS THE ";...`.."LAST PA
RT OF THIS  TUTORIAL.":.".IT WILL REPAY 
";...J.."STUDY, WHICH YOU CAN DO BYLISTI
NG IT, OF COURSE.".C.T..1350...~..".BEFO
RE WE FINALLY LOAD THE LAST SECTION OF T
HE TUTORIAL ";.>...."(THE SAMPLE FILE),W
OULD YOU LIKE TO REVIEW THIS ";......"SE
COND SECTION  AGAIN?":.".IF YOU WOULD, P
RESS Y (FOR 'YES'). ";.E...."YOU  WILL T
HEN AUTOMATICALLY GO BACK TO THE  BEGINN
ING ";......"OF THE SECTION."......".IF,
 HOWEVER, YOU ARE HAPPY WITH YOUR UN-DER
STANDING OF ";.G...."WHAT YOU'VE LEARNT,
 PRESSN (FOR 'NO') AND CARRY ON TO THE N
EXT   ";...D.."PAGE, WHICH BRIEFLY DESCR
IBES THE FILE  PROGRAM BEFORE LOADING.".
..N..".......... WOULD YOU LIKE TO REVIE
W ? ."...X..A$:.A$."".1240.,....A$."N"..
".................... NO .":.I.1.1750:.:
.1290.B....A$."Y".."....................
 YES .":.I.1.1500:......."..............
...........RETURNING TO FIRST PAGE IN A 
FEW SECONDS.";.B....I.1.6000:.:.100.....
.1350:."...........WE'LL NOW LOAD THE DE
MONSTRATION FILE   ";.G...."PROGRAM. YOU
'LL NEED A BLANK CASSETTE   AFTER THE LO
ADING ";.~...."IS COMPLETED. PLEASE  HAV
E ONE AVAILABLE.":.1350...(..:."........
........ DEMONSTRATION PROGRAM LOADING .
"...2..B(45058).180.:$X,B(45051).48,"FIL
ING 3   00T01...<..:..:.F.."............
................ PRESS THE SPACE KEY TO 
CONTINUE .".I.P..59410,4,4.].Z..B.1.30:.
A$:.:...

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