ZX81 Programs


Read about, play, run, or list games, animations, and more. These are my programs from the ’80s to today.

ZX81 Program Listing

**THE BALL**SLR/1983/2012/2014** (ballmc.p)


SYSTEM VARIABLES

PROG  : 16509
D-FILE: 29094
VARS  : 29887
E-LINE: 29888
STKBOT: 29888
STKEND: 29888


LEGEND

A means INVERSE A
A means GRAPHICS A
PRINT means treat as KEYWORD P


PROGRAM LISTING

   0 REM MCII
30403 ?/INKEY$?INKEY$?CALL INKEY$
??INKEY$?  ??INKEY$?5PI?8PI?
INPUT PI?ERR MSGS CALL LN V284
IF INT £FAST STR$ ACS ?CAY-LN 5
PILN (INKEY$)(BLN UNPLOT RNDK;)
CONT 7LN UNPLOT RNDK=)HOME  LN
UNPLOT RNDK>2SLN UNPLOT RNDK)/=
LN 2INKEY$)CONT 7LN 2INKEY$)
HOME  LN 2INKEY$2SLN 2INKEY$21
LN 2INKEY$SGN LPRINT TAN FAST B
GOSUB DELETE LPRINT TAN Y0B
GOSUB DELETE S7W/RAND ;?5PI?J
LINE ?J?7TAN RND)5 FAST GOSUB
UNDRAW /RNDD7FAST ;FOR 5CHR$ 2
GOSUB PISTOP AT FOR GOSUB K
LPRINT 1Q2D6:RNDCLEAR QT5CLEAR Q
U7TAN LN V21COPY RETURN JFAST
GOSUB PILPRINT COS //LN V2G4IF
LN V2?RETURN COPY CSAVE 1COPY
RETURN JFAST GOSUB PILPRINT C
INPUT JERR MSGS 8COS 9EDIT LN XE
ASN DRNDTAN ACS UNPLOT 6ORNDEO
RND?NEW ?PCOS LN CALL INKEY$C
NEXT TAN YF( AND GOTO PICHAR Y1
ACS CK2Y4ACS DK2ACS EPRINT LN
INT INKEY$EACS ?K2INPUT ?CHAR )2
£UKRND<IF VAL INKEY$LET J4/2LET
KRETURN AS2INPUT ?/QY*( AND
GOTO PI?NEW 3DEF PROC VAL VAL
VAL JACS (ACS (ACS (POP LINE DD
AT CHAR DAT CHAR DGOSUB UNDRAW
£RNDD76:RNDAT Y/(MURNDY5)MTRND
TAN STR$ FAST VAL RETURN
8218 RNDACS AUTO C5LN ( /QE:RND
LN DO PI/CRETURN RNDABS JPI51RND
ACS AUTO C5LN ( /*E:RNDPRINT
LET E:RND?76:RND5TRNDPAT LPRINT
SGN TAN 7PRINT 6:RNDCLEAR QT5UU
RNDXMURNDRETURN 2ATN PUSH PILET
TAN U5RNDRETURN  CTXM5RND/AE£RND
1SAVE 2DQ?FAST LN CALL INKEY$C
CLS LPRINT RETURN CASN ES
RETURN ZC:RETURN D4EACS 0F?O4
CLS ?/INKEY$LN PUSH A/ABS ?LCOS
,LN 5PI<"/PRINT RETURN CALL SD
RETURN ""ACS R AND FPINEW Z5)1
CHAR 4RETURN 5K£RETURN 1C4
RETURN *S4JLN 5PIACS 5PI7/PRINT
NEW ZLN 5PIJ?APIINT F?MCIF LN O
CALL VAL UNDRAW PI)  STR$ FOR 7D
FOR D?+?0FOR KPLOT FOR FOR J?3
LINE ?3?OC/FOR JACS 0ACS 1?+?0
IF DCALL ?+DEF PROC ?0CHAR STOP
;STOP /<>LPRINT AT ACS ?TAB (
INKEY$TAN ERR MSGS ?*>=(INKEY$
FOR ?CCHAR ACS ?TAB (INKEY$TAN
GOSUB OFFMRNDONICLEAR ?RT GOSUB
DELETE /GOSUB DELETE /READ
END PROC GOSUB DELETE K176MRND
ACS WERR MSGS EDIT TAN LN   E-
RND7PRINT LN -DPOKE LN -DPOKE
LN SCHAR LN INPUT DEF PROC INT ?
LN RAUTO LN <>AUTO TAN LN LEN
AUTO YCODE LN RUN DEF PROC LN *
EDIT /$LN RAUTO 5  LN >ERR MSGS
7LN NEXT AUTO FAST LN LEN AUTO
LPRINT LN >ERR MSGS LN A
ERR MSGS LN LLIST A)CLEAR CALL 1
LN IF DEF PROC E?RNDLN INPUT
DEF PROC )RUN CALL 14 LN IF
DEF PROC E?RNDLN INPUT DEF PROC
LN .CHAR LN .CHAR YRUN LN RUN
DEF PROC Y?LN RUN DEF PROC LN
LET DEF PROC RETURN YTAB DRND5
LIST CALL FAST LN ESE?RNDDIM LN
POKE DEF PROC 4CLS INT ?
30455  
30386 DER II ENDAT YTAN ?BDPOKE 6
?RNDGOSUB OFF0RND<5?RNDLN OFF
DPOKE 5  6?RNDE?RND6?RNDLN A
DEF PROC WM5END PROC 5?RNDFAST
LN 7DPOKE LPRINT FAST 7776-RNDU*
RNDM5RNDLN -DPOKE RETURN PAUSE
ATN NEXT ERR MSGS RETURN RAND
ATN CHR$ UNDRAW RETURN IF ATN ,
EDIT RETURN THEN CREM RETURN
DIM ATN JDEF PROC RETURN GOTO
ATN ?DPOKE RETURN GOSUB ATN >
DPOKE RETURN FOR ATN PAUSE
UNDRAW RETURN NEXT ATN 2PROTECT
RETURN SLOW ATN ""AUTO RETURN
POKE ATN VAL UNDRAW RETURN FAST
ATN LAUTO RETURN INPUT ATN Y
PROTECT RETURN PLOT ATN DATA
EDIT RETURN UNPLOT ATN 6EDIT
RETURN LET ATN 2 RETURN CLS ATN
KUNDRAW RETURN STOP ASN £UNDRAW
RETURN PRINT ATN LET DPOKE
RETURN LPRINT ATN CHR$ DPOKE
RETURN NEW ATN 2DPOKE RETURN
COPY ATN UNPLOT ERR MSGS RETURN
REM CPROTECT RETURN SCROLL ATN P
UNDRAW RETURN RETURN ATN $
ERR MSGS RETURN CLEAR ATN A
DEF PROC RETURN  4;E-RND-DPOKE
RETURN
8202 2DEF PROC TAB QERR MSGS LN
£UNDRAW LN LEN AUTO YSLN RUN
DEF PROC ?DRNDLN HTRACE 5=RND?S
UNDRAW 5PUSH A?SUNDRAW 5?7?S
UNDRAW SCROLL RETURN ?4SGN LN
RUN DEF PROC 5/DPOKE LN SUNDRAW
/LEN 1RETURN RETURN GOSUB POP
ACS 1**?POKE DEF PROC UNTIL 7
RESTORE STR$ FOR FAST 67RND6SRND
LN .CHAR LN INPUT DEF PROC JLN
RUN DEF PROC LPRINT LN BREAK
DPOKE ..FOR SGN LN OFFDPOKE
GOSUB OFF?RNDLN OFFDPOKE FAST
GOSUB OFF?RNDBGOSUB DELETE
LPRINT **6?RND?SCROLL CHAR ?7?7
TAN RESTORE 7UNTIL 7TAN FAST AT
E0RND7LN NOSTALGIC DPOKE FOR B
GOSUB PISQR E?RNDGOSUB DELETE **
FOR 7/GOSUB Y?PRINT LN -DPOKE
LN DO PROTECT LN BREAK DPOKE
FOR LN NOSTALGIC DPOKE FOR LET ?
UUNDRAW YLN /DIM FAST SCROLL
RETURN
10249 C5PRINT LN RUN DEF PROC
LET LPRINT TAN VAL FAST E?RND
PRINT ?FAST 76?RNDLN POKE
DEF PROC RETURN D4-Y
52727 LN INPUT DEF PROC JLN RUN
DEF PROC LET A ?LN INPUT
DEF PROC /2LPRINT LET LPRINT AT
JTAN 5CLEAR ACS LN XUNDRAW 51
EXP LN XUNDRAW LN LET DPOKE 5
CLEAR ACS LN XUNDRAW 51:?X
UNDRAW LN -DPOKE RETURN
8198 ERROR LN -DPOKE RETURN
INKEY$CZRETURN
51890 "CYRETURN AT C?RETURN CHR$
ASN >=ERROR RETURN TAB ASN GOTO
ERROR RETURN ,ASN OERROR PRINT E
-RND7LET 1TERROR VAL 1  VAL 1M
TRACE VAL ?CHAR UNDRAW 5INPUT
DEF PROC LN SUNDRAW /RESEQ 5RND
TRACE LN SUNDRAW /7LN LOOP
ERROR 5IF DEF PROC LN SUNDRAW /
CHAR Y?LN BDPOKE E?RNDFAST LN X
UNDRAW 1COPY COPY LN TRACE  7
PRINT LN RUN DEF PROC LET
RETURN "C5LN BDPOKE /INPUT
LPRINT VAL GOSUB OFF?RNDLN OFF
DPOKE Y)LN UUNDRAW Y1LPRINT ?U
UNDRAW LN IUNDRAW LN SQR UNDRAW
5CALL EDIT LN XUNDRAW 5PRINT A
LN SUNDRAW LN -DPOKE RETURN ,C>
RETURN ;ASN CLS DPOKE RETURN +
ASN CLS DPOKE 5.CHAR LN SUNDRAW
JTAN 5XERROR LN SUNDRAW ?CLS
DPOKE 51RNDACS AUTO TAB :"JLN
RUN DEF PROC UTRNDRETURN )S
UNDRAW :(Y/5URND-CHAR ?PRINT A
LN ERR MSGS UNDRAW Y?LN BDPOKE 5
RUN DEF PROC LN SUNDRAW /JLN H
TRACE 5RUN ERROR LN SUNDRAW /8?
NEW 3DEF PROC 51RNDACS AUTO C:5S
RND-ACS COPY LEN WUSR ?A?2DUTRND
CHR$ 5QUNPLOT .CHAR /RY
50167 LN ABS 5IF DEF PROC LN S
UNDRAW ?.ERROR LN NOSTALGIC
DPOKE STR$ LN NOSTALGIC DPOKE
STR$ AT SGN TAN RETURN RNDABS
CONT ERR MSGS 1WRND2LN LINE
CALL RETURN 0SSRETURN RNDKTLN -
DPOKE 7/INPUT RETURN (ME
END PROC C4RETURN $4272SACS
COPY 2LN 6CHAR A ?DDGOSUB
UNDRAW ?RNDDCHAR UEEND PROC
RETURN $CARETURN (42JTAN ?TAN Y1
TAN E4RND91WRNDJMTEND PROC SY
ACS ?4KACS LIST ACS RNDFAST 5T
END PROC OASN CONT ERR MSGS
LPRINT ?FFAST LN SCROLL CHAR
LPRINT 7ACS ?CNEXT J?6DEND PROC
UTEND PROC LN DPEEK CHAR RETURN
14"Y5LN UUNDRAW 5SAVE CHAR LN S
UNDRAW UTEND PROC 55END PROC
ERROR 4S**?TAN EDEND PROC )M 
GOSUB DELETE GOSUB OFF?RNDGOSUB
DELETE SQR INT 6FAST LN
NOSTALGIC DPOKE ?NLPRINT ""
GOSUB OFF1END PROC LN OFFDPOKE )
  LN OFFDPOKE E?RNDGOSUB OFF1
END PROC ;61END PROC 1  ?COS :
LN -DPOKE LN SCHAR RETURN 1ASN
RESEQ RETURN  4SLN DPOKE ACOPY
FAST LN -DPOKE RETURN =TAB CONT
ERR MSGS LN HTRACE LPRINT ?
RETURN COPY 4£5SGN FOR LN X
UNDRAW 5OFFDPOKE ?SUNDRAW Y6?U
UNDRAW FAST 5NOSTALGIC TRACE LN
SUNDRAW LN -DPOKE LN LINE CALL
RETURN (46LPRINT LN ** 5STR$
VAL LN XUNDRAW 5DUP DEF PROC LN
SUNDRAW LN -DPOKE LN 3 5AT SGN
LN XUNDRAW 5?DEF PROC ?SUNDRAW
LN -DPOKE LN 3 LPRINT Y5LN U
UNDRAW 5?TRACE ?SUNDRAW I+FAST
LN -DPOKE RETURN (CRAND RETURN "
45LN LOOP ERROR /END WHEN
RETURN INKEY$4A5RNDTRACE LN S
UNDRAW /USER RETURN CHR$ 4"LN
ERR MSGS UNDRAW 5UTRACE LN S
UNDRAW /DELETE LN ABS /EDIT LN
SCHAR LN -DPOKE FAST LN LINE
CALL RETURN (4NLN -DPOKE LN H
TRACE E-RNDDATA LOOP LN XUNDRAW
/"LN -DPOKE RETURN TO TAB CONT
ERR MSGS LN OUNDRAW 5AUTO TRACE
LN SUNDRAW LPRINT Y5LN UUNDRAW 5
WHILE TRACE ?SUNDRAW LPRINT Y5
LN UUNDRAW 5HCHAR ?SUNDRAW 5
LINE TRACE LN SUNDRAW LN LINE
CALL RETURN )CDLPRINT X""LN -
DPOKE ?5 LN -DPOKE /FOR ?11 /D
LN POKE DEF PROC 1  GCOS £)D
END PROC >TAN B.GOSUB DELETE
ERR MSGS EDIT LIST INT FSTR$ LN
NOSTALGIC DPOKE FOR SGN ;FOR
TAN E1END PROC 65END PROC TAN ?L
COS E5END PROC FOR GOSUB KGOSUB
DO 5END PROC TAN FAST E5
END PROC GOSUB OFF1END PROC B
GOSUB DELETE FAST AT LPRINT LN
NOSTALGIC DPOKE VAL FAST LN ?
DEF PROC LPRINT AT ?7?TAN FOR TA
?RETURN  C1ACS  DRAW ?FOR 5  
ACS T3K1;FOR DFOR (PRINT TAN J
PRINT LN ERR MSGS UNDRAW LN
LINE CALL RETURN + AND RNDDRAW
RETURN ;ABS RNDDRAW YFAST LN B
DPOKE LN -DPOKE PRINT LN
ERR MSGS UNDRAW LET RETURN +C4
RETURN -47AT LINE ?RETURN  44
PRINT FAST /PEEK FAST 5ERR MSGS
EDIT LN XUNDRAW LN NEXT TRACE Y
FAST 5PUSH NOSTALGIC LN UUNDRAW
/ZPRINT VAL /0RETURN /C(RETURN *
TAB CONT ERR MSGS LN VDRAW 5)
TRACE LN SUNDRAW /BLN VDRAW 5
CLEAR DEF PROC /NEXT YLPRINT LN
BDPOKE LET RETURN  COS RETURN +C
)LN VDRAW 5BFOR LN XUNDRAW 5
GOSUB DELETE LN XUNDRAW /SCROLL
LN VDRAW Y;LN BDPOKE /<>YSGN ?B
DPOKE RETURN )4USR LN -DPOKE /
INT RETURN PEEK 4?LN ERR MSGS
UNDRAW 5A ?XUNDRAW RETURN USR 4>
LN ERR MSGS UNDRAW 5PUSH DRAW ?S
UNDRAW 1?DRAW VAL FAST TAN
NOSTALGIC PUSH TAN RETURN CODE 4
G55END PROC YELN UUNDRAW YFAST
LN BDPOKE ICOPY LN 5 YSGN LN B
DPOKE 5>DRAW /USR E5END PROC
GOSUB DO 5END PROC JGOSUB
DELETE LINE ?COS ,?TAN RETURN
RND455ARND/VRETURN ABS 4)LN
ERR MSGS UNDRAW 5ACS ?LN X
UNDRAW YCODE 5?UNDRAW ?UUNDRAW
RETURN INT ASN ERR MSGS UNDRAW
RETURN LEN 4,LN -DPOKE LN SCHAR
LN -DPOKE Y5LN UUNDRAW 5>=DRAW /
F77LN NOSTALGIC DPOKE FOR TAN
RETURN SGN 4+LN ERR MSGS UNDRAW
5LIST DRAW ?SUNDRAW ?PCOS ACS ?5
1 TAB ?UNDRAW TAN RETURN SQR
TAB CONT ERR MSGS LN ERR MSGS
UNDRAW 5SUNDRAW ?SUNDRAW JXACS ?
C2INT G?ELSE A )RND TAGOSUB
DELETE K1;ZACS >EGOSUB
CLR STACK EGOSUB CLR STACK (
LIST CLR STACK LINE TAN LN H
TRACE LN -DPOKE PRINT YFAST LN B
DPOKE LN HTRACE YSGN LN BDPOKE
LET TAN LN -DPOKE RETURN -PRINT
ATN -DPOKE RETURN (C-RETURN RNDK
$RETURN AUSR ?UNDRAW >=8UNDRAW
LET ATN ELSE UNDRAW TAN LN
TRACE DRAW /PLOT LN HTRACE /LET
5?UNDRAW /CHAR ?JLINE ?J?7TAN
LN SCHAR RETURN  ASN >DEF PROC Y
E/PLN DO PROTECT Y5/I)(BLN A
DPOKE LN $ERR MSGS U5END PROC
DEF PROC £E?RND6?RNDT4LN BDPOKE
(CLS $4PLOT LPRINT GOSUB UNDRAW
?RNDTAN 5ES/75"RNDYLN LN BDPOKE
?LN BDPOKE ??BDPOKE LN IUNDRAW
LN SQR UNDRAW 5FOR ?/GOSUB
RETURN ,TAB CONT ERR MSGS TAN
LN LINE CALL RETURN
10245 TRACE /AYE5ORNDLN UUNDRAW Y
65MRND?UUNDRAW LN -DPOKE LN S
CHAR FAST FAST LN -DPOKE LN I
UNDRAW Y7LN BDPOKE 5GOSUB DO LN
XUNDRAW LPRINT LN XUNDRAW Y677
LN UUNDRAW LPRINT GOSUB OFF?RND?
OFFDPOKE LN -DPOKE LN SCHAR
FAST FAST YELN UUNDRAW 576LN X
UNDRAW LPRINT LN XUNDRAW 77Y
GOSUB LN BDPOKE YOFFLN UUNDRAW Y
B5GOSUB DELETE LN UUNDRAW YIF
LPRINT LN NOSTALGIC DPOKE FOR ?U
UNDRAW 5  /?LN -DPOKE RETURN  
LN )TRACE LET RETURN AABS CONT
ERR MSGS RETURN 0 AND CONT
ERR MSGS CHR$ 0T DEF PROC D/ TO
FAST E-RND)5 ;6-RNDLPRINT TAN
LN -DPOKE LN SCHAR RETURN 1C1
PRINT FAST 5*EDIT LN SUNDRAW
LPRINT LET RETURN  TAB EXIT Y
FOR LN BDPOKE LN SUNDRAW Y5LN U
UNDRAW LN -DPOKE 5VPROTECT ?S
UNDRAW GOSUB UNDRAW 1END PROC
VAL FAST LN 2EDIT 61END PROC
FAST LN PAUSE PROTECT RETURN
10249 KPRINT LN $EDIT /LIST SGN
GOSUB DELETE FAST AT LPRINT LN 6
TRACE AT GOSUB CALL 1END PROC
FAST LN 2EDIT 1LN ?DEF PROC
LPRINT TAN FAST LN LET DEF PROC
LPRINT RETURN ?""J?FY
48672 £RND1SAVE 2DYL?TAN ?7Y
48672 /PAUSE LN 2EDIT FAST FAST
LN PAUSE PROTECT RETURN
10257 CARETURN 0SLET RETURN AK
GOSUB LN $EDIT /CONT 5  SGN ,
RETURN -C(RETURN LC?CHR$ 0DFAST
DDAT DT DEF PROC D</CONT SGN ,
RETURN -PRINT LN NEW PROTECT
LET ""??UNDRAW Y.PRINT LN I
UNDRAW LN SQR UNDRAW 5UNDRAW
DPOKE LN XUNDRAW YYLN BDPOKE
LET LN BDPOKE YM5KRNDLN UUNDRAW
5,RND?SUNDRAW Y4/**?PCOS ?NCOS R
TAN ?PC2RTAN ?NCOS RTAN E-RND7(C
PLOT RETURN INKEY$ASN ERR MSGS
AUTO RETURN CHR$ ASN ERR MSGS
AUTO RETURN "ASN ERR MSGS AUTO 7
LN IUNDRAW RETURN OR 4S5?EDIT
LN SUNDRAW YABS /CHAR RETURN
AND 455EEDIT /LIST PRINT YB5
GOSUB DELETE LN UUNDRAW LET
RETURN =44YTAB /GRETURN <>44Y
ASN /8RETURN >C+RETURN <4EYASN
LN 5AUTO /<RETURN >=4S5C7LN X
UNDRAW YPAUSE /ERETURN <=TAB
CONT ERR MSGS YIF LN 5AUTO LN -
DPOKE RETURN AND ASN ,EDIT TAN
LN BDPOKE ESRND7LN BREAK DPOKE
FOR LN NOSTALGIC DPOKE FOR ?X
UNDRAW LN XAUTO 65END PROC 6E
END PROC TAN E5END PROC QCOPY 7
TAN 5NOSTALGIC TRACE LN SUNDRAW
LN 3 LN -DPOKE PRINT 5NAUTO LN S
UNDRAW LN 3 5XAUTO LN SUNDRAW 52
AUTO LN SUNDRAW LET RETURN =44Y
TAB /ARETURN <>44YASN /2RETURN >
4EYASN LN 5AUTO /ARETURN <C<
RETURN >=44Y AND /ERETURN <=TAB
CONT ERR MSGS 5C7LN XUNDRAW Y
ABS ?+AUTO EEEND PROC GOSUB
UNDRAW 1END PROC SWOY""RETURN  
COS 77/POKE 5RAUTO ?SUNDRAW LN
SCROLL 25VRNDACS QTAN 5LEN AUTO
?SUNDRAW 5VRNDACS PLOT ?E252 LN
**D""FAST LN 2DEF PROC SGN ?
DATA S52 LN **D""LN 2DEF PROC
COS LN 2DEF PROC COS LOOP DATA E
£RND/SCROLL 777VAL 7777VAL LN
EXP AUTO 57 LN **DAT LN 2D7Y
28963 7AT ?7?7QREM 7?7?7TAN 77
AUTO 7ERROR D7U£RND1""U$RND0TAN
LN -DPOKE LN SCHAR Y5LN UUNDRAW
YGOSUB LN BDPOKE YOFF51END PROC
LN UUNDRAW 5OFFDPOKE LN SUNDRAW
LN HTRACE 5UNTIL DEF PROC ?S
UNDRAW 7D7FAST FAST AT E1
END PROC LN COS :AT LN DUP
DEF PROC GOSUB DO 1END PROC TAN
E1END PROC DATA LOOP <Q /7E1
END PROC ?LCOS GOSUB KTAN FAST
LN ERR MSGS UNDRAW 5GOSUB
UNDRAW LN XUNDRAW LPRINT LN X
UNDRAW 5DD?XUNDRAW LN DPOKE 5
NOSTALGIC DPOKE LN SUNDRAW 5FOR
SGN ?XUNDRAW E4RND9QCOPY FQCOPY
FQ 6DEND PROC Y5E?RNDLN UUNDRAW
I:U5END PROC LINE LN XUNDRAW 5
ATN DEF PROC ?SUNDRAW £JM5RNDT4?
7(UNPLOT $4RUN 54 6?RNDE0RND1
HOME  D61END PROC 65END PROC
TAN ?HRND?:RND?)RND?1RND?4RND
FOR ?7RNDACS ?  EXP ?LN ?QDREM
30241 :(LN ATN DEF PROC ?Y
END PROC THE BALL<BY:STEVEN REID
(C)1983>)3END PROC 1LN IF
DEF PROC LN .CHAR ?END WHEN
END PROC                        
         )EDIT END PROC 1LN
IF DEF PROC LN .CHAR 52 FAST 5= 
SGN 7GOSUB DO FOR WHEN 6GOSUB
WHEN ?$END PROC  )£END PROC 11 
LN IF DEF PROC 5S LN RUN ERROR ?
LEND PROC     AAAAHHHHAAHH  )3
END PROC 1LN IF DEF PROC 53 
LN RUN ERROR ?CODE END PROC  )?
END PROC 11 LN IF DEF PROC LN .
CHAR EFOR WHEN 76FOR WHEN GOSUB
OFFGOSUB WHEN BGOSUB DELETE IF G
END PROC ?4                     
           )SLOW END PROC 1LN
IF DEF PROC 5  6LOAD WHEN 5IF  6
NEXT WHEN 51 LN ?UNDRAW 6RUN
WHEN 51 6CLS WHEN 5= 6COPY WHEN
51 67INDENT ECOPY WHEN 6EINDENT
E7INDENT 6"INDENT 5?INDENT LN
SAVE CHAR LN NOSTALGIC TRACE ?
EDIT  )PROTECT 11 LN LINE TRACE
5?INDENT LN ?TRACE 5<INDENT LN
SAVE CHAR LN NOSTALGIC TRACE ?
PUSH  )POP 11 LN LINE TRACE 5<
INDENT LN ?TRACE 51 6*INDENT E
COPY WHEN FAST EEINDENT SGN B
GOSUB DELETE ASN FEEINDENT FAST
E"INDENT SGN CALL EDIT LN PRINT
A5<INDENT LN SAVE CHAR 5<INDENT
LN HCHAR LN IF DEF PROC LN .
CHAR E7INDENT FAST E"INDENT SGN
BGOSUB DELETE ASN **EEINDENT
FAST E"INDENT SGN CALL EDIT LN
PRINT A5<INDENT LN SAVE CHAR 5<
INDENT LN HCHAR LN IF DEF PROC
LN .CHAR ECOPY WHEN FAST E7
INDENT SGN CALL EDIT LN PRINT A5
?INDENT LN SAVE CHAR 5?INDENT
LN HCHAR LN IF DEF PROC LN .
CHAR ELOAD WHEN FAST 51 SGN B
GOSUB DELETE TAB ADELETE LN ;DO
ELOAD WHEN FAST 5  SGN BGOSUB
DELETE TAB ;DELETE LN DPEEK
EXIT ECOPY WHEN 6EINDENT E7
INDENT 6"INDENT ECOPY WHEN FAST
ERUN WHEN SGN ;6COPY WHEN E7
INDENT FAST ECLS WHEN SGN ;67
INDENT ECOPY WHEN FAST 52 SGN B
GOSUB DELETE TAB LOOP DELETE E
RUN WHEN LN ?UNDRAW 6RUN WHEN E
COPY WHEN FAST 5= SGN BGOSUB
DELETE TAB DUP DELETE ERUN WHEN
LN ?UNDRAW 6RUN WHEN E7INDENT
FAST 51 SGN BGOSUB DELETE TAB W
DELETE ECLS WHEN LN ?UNDRAW 6
CLS WHEN E7INDENT FAST 52 SGN B
GOSUB DELETE TAB ;DELETE ECLS
WHEN LN ?UNDRAW 6CLS WHEN E*
INDENT FAST 52 SGN BGOSUB
DELETE TAB HDELETE 51 6LOAD
WHEN ELOAD WHEN FAST 51 SGN B
GOSUB DELETE TAB YDELETE ?LN
DELETE E*INDENT FAST 51 SGN ;6*
INDENT ?LIST DELETE E*INDENT
FAST 51 SGN BFOR GOSUB DELETE 6*
INDENT E*INDENT FAST 51 SGN B
GOSUB DELETE TAB LIST DELETE 5  
6LOAD WHEN LN NOSTALGIC TRACE
LN RNDTRACE LN LINE TRACE LN N
AUTO ? DO Q)COPY DELETE 11 LN
LINE TRACE LN XAUTO LN 2AUTO
TAB <DO TAN LN NWHILE ?50 SGN B
GOSUB DELETE TAB CALL DO 5?
INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?ODO  )NDO 11 
LN LINE TRACE 5?INDENT LN ?
TRACE E*INDENT FAST 5. SGN B
GOSUB DELETE TAB END WHEN DO 5<
INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?RESTORE DO  )
DATA DO 11 LN LINE TRACE 5<
INDENT LN ?TRACE E*INDENT FAST 5
SGN BGOSUB DELETE TAB *DO 5?
INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?HDO A)EDO 11 
LN LINE TRACE 5?INDENT LN ?
TRACE E*INDENT FAST 5; SGN B
GOSUB DELETE TAB AT DO 5<INDENT
LN SAVE CHAR LN NOSTALGIC TRACE
?MDO H)LDO 11 LN LINE TRACE 5<
INDENT LN ?TRACE E*INDENT FAST 5
SGN BGOSUB DELETE TAB FOR DO 5
?INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?>=DO H)<=DO 11 
LN LINE TRACE 5?INDENT LN ?
TRACE E*INDENT FAST 5* SGN B
GOSUB DELETE TAB +LOOP 5<INDENT
LN SAVE CHAR LN NOSTALGIC TRACE
?TLOOP A)5LOOP 11 LN LINE TRACE
5<INDENT LN ?TRACE E*INDENT
FAST 5- SGN BGOSUB DELETE TAB Z
LOOP 5?INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?KLOOP A)JLOOP 1
1 LN LINE TRACE 5?INDENT LN ?
TRACE E*INDENT FAST 5+ SGN B
GOSUB DELETE TAB PUSH LOOP 5<
INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?RESEQ LOOP H)
INDENT LOOP 11 LN LINE TRACE 5<
INDENT LN ?TRACE E*INDENT FAST 5
SGN BGOSUB DELETE TAB <LOOP 5?
INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?RLOOP H)6LOOP 1
1 LN LINE TRACE 5?INDENT LN ?
TRACE E*INDENT FAST 5) SGN B
GOSUB DELETE TAB XLOOP 5<INDENT
LN SAVE CHAR LN NOSTALGIC TRACE
?ILOOP A)HLOOP 11 LN LINE TRACE
5<INDENT LN ?TRACE E*INDENT
FAST 5: SGN BGOSUB DELETE TAB
SCROLL LOOP 5?INDENT LN SAVE
CHAR LN NOSTALGIC TRACE ?**LOOP
 )NOT LOOP 11 LN LINE TRACE 5?
INDENT LN ?TRACE E*INDENT FAST 5
SGN BGOSUB DELETE TAB )EXIT 5<
INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?2EXIT  )1EXIT 1
1 LN LINE TRACE 5<INDENT LN ?
TRACE E*INDENT FAST 5S SGN B
GOSUB DELETE TAB VEXIT 5?INDENT
LN SAVE CHAR LN NOSTALGIC TRACE
?GEXIT  )FEXIT 11 LN LINE TRACE
5?INDENT LN ?TRACE E*INDENT
FAST 5D SGN BGOSUB DELETE TAB
BREAK EXIT 5<INDENT LN SAVE
CHAR LN NOSTALGIC TRACE ?UNTIL
EXIT  )EXIT EXIT 11 LN LINE
TRACE 5<INDENT LN ?TRACE TAN E*
INDENT FAST 5D SGN BGOSUB
DELETE TAB (EXIT 5?INDENT LN
SAVE CHAR LN NOSTALGIC TRACE ?Q
EXIT  ) EXIT 11 LN LINE TRACE 5?
INDENT LN ?TRACE E*INDENT FAST 5
S SGN BGOSUB DELETE TAB UEXIT 5<
INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?FEXIT  )EEXIT 1
1 LN LINE TRACE 5<INDENT LN ?
TRACE E*INDENT FAST 5$ SGN B
GOSUB DELETE TAB SLOW EXIT 5?
INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?STR$ EXIT H)
USR EXIT 11 LN LINE TRACE 5?
INDENT LN ?TRACE E*INDENT FAST 5
SGN BGOSUB DELETE TAB :UNTIL 5
<INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?COPY EXIT A)
RETURN EXIT 11 LN LINE TRACE 5<
INDENT LN ?TRACE E*INDENT FAST 5
SGN BGOSUB DELETE TAB SUNTIL 5
?INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?DUNTIL A)C
UNTIL 11 LN LINE TRACE 5?INDENT
LN ?TRACE E*INDENT FAST 5> SGN B
GOSUB DELETE TAB *UNTIL 5<
INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?DO UNTIL H)
DELETE UNTIL 11 LN LINE TRACE 5<
INDENT LN ?TRACE E*INDENT FAST 5
SGN BGOSUB DELETE TAB £UNTIL 5
?INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ??UNTIL H)?
UNTIL 11 LN LINE TRACE 5?INDENT
LN ?TRACE E*INDENT FAST 5- SGN B
GOSUB DELETE TAB QUNTIL 5<
INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?BUNTIL A)A
UNTIL 11 LN LINE TRACE 5<INDENT
LN ?TRACE E*INDENT FAST 5* SGN B
GOSUB DELETE TAB STEP UNTIL 5?
INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?SGN UNTIL A)
SQR UNTIL 11 LN LINE TRACE 5?
INDENT LN ?TRACE E*INDENT FAST 5
SGN BGOSUB DELETE TAB SWHILE 5
<INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?CLS UNTIL H)IF
UNTIL 11 LN LINE TRACE 5<INDENT
LN ?TRACE E*INDENT FAST 5; SGN B
GOSUB DELETE TAB OWHILE 5?
INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?9WHILE  )8
WHILE 11 LN LINE TRACE 5?INDENT
LN ?TRACE E*INDENT FAST 5, SGN B
GOSUB DELETE TAB RESTORE WHILE 5
<INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?DEF PROC WHILE
 )AUTO WHILE 11 LN LINE TRACE 5<
INDENT LN ?TRACE E*INDENT FAST 5
SGN BGOSUB DELETE TAB HWHILE 5
?INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ??WHILE  )?
WHILE 11 LN LINE TRACE 5?INDENT
LN ?TRACE E*INDENT FAST 50 SGN B
GOSUB DELETE TAB MWHILE 5<
INDENT LN SAVE CHAR LN
NOSTALGIC TRACE ?7WHILE  )6
WHILE 11 LN LINE TRACE 5<INDENT
LN ?TRACE TAN 51 FAST ENEXT
WHEN SGN 7GOSUB DO .INDENT 61
INDENT E.INDENT 76.INDENT GOSUB
OFF1INDENT BGOSUB DELETE IF ?
WHILE E3INDENT FAST 5  SGN B
GOSUB DELETE PAUSE LET WHILE E3
INDENT FAST 51 SGN BFOR GOSUB
DELETE 63INDENT E3INDENT FAST 51
 SGN BGOSUB DELETE TAB 0WHEN 5+ 
FAST 5: SGN CALL EDIT LN PRINT A
?<WHEN     )?WHEN 14 LN IF
DEF PROC ENEXT WHEN 67INDENT LN
NOSTALGIC TRACE LN RNDTRACE LN
LINE TRACE LN NAUTO ?MWHEN 7)L
WHEN 11 LN LINE TRACE LN XAUTO
LN 2AUTO TAB END PROC WHEN E
NEXT WHEN FAST 5S SGN ;6NEXT
WHEN ENEXT WHEN FAST 5CONT 7SGN
BGOSUB DELETE PAUSE HOME WHEN 5
CONT 76NEXT WHEN LN NOSTALGIC
TRACE LN RNDTRACE LN LINE TRACE
LN NAUTO ??WHEN 6)?WHEN 11 LN
LINE TRACE LN XAUTO LN 2AUTO
TAB +WHEN ENEXT WHEN FAST 5S 
SGN BFOR GOSUB DELETE 6NEXT
WHEN ENEXT WHEN FAST 5  SGN B
GOSUB DELETE ASN GWHEN IF GWHEN
5  6NEXT WHEN E7INDENT FAST E
NEXT WHEN SGN BGOSUB DELETE TAB
VWHEN TAN 5+ FAST 5: SGN CALL
EDIT LN PRINT AENEXT WHEN LN
INPUT DEF PROC ?ABS WHEN  )SGN
WHEN 11 LN IF DEF PROC 5S 63
INDENT TAN TAN         + + 1   
IF    COPY COPY   COPY COPY   : 
  )   ?   >   "?1 F?1 )   CLS  
CLS      IF    1 7WHEN  REM     
  MCODER II         COPYRIGHT 19
83   D C THRELFALL COMPILER AT 1
7300 PROG AT 20500
   0 REM MCII
30403 ?/INKEY$?INKEY$?CALL INKEY$
??INKEY$?  ??INKEY$?5PI?8PI?
INPUT PI?ERR MSGS CALL LN V284
IF INT £FAST STR$ ACS ?CAY-LN 5
PILN (INKEY$)(BLN UNPLOT RNDK;)
CONT 7LN UNPLOT RNDK=)HOME  LN
UNPLOT RNDK>2SLN UNPLOT RNDK)/=
LN 2INKEY$)CONT 7LN 2INKEY$)
HOME  LN 2INKEY$2SLN 2INKEY$21
LN 2INKEY$SGN LPRINT TAN FAST B
GOSUB DELETE LPRINT TAN Y0B
GOSUB DELETE S7W/RAND ;?5PI?J
LINE ?J?7TAN RND)5 FAST GOSUB
UNDRAW /RNDD7FAST ;FOR 5CHR$ 2
GOSUB PISTOP AT FOR GOSUB K
LPRINT 1Q2D6:RNDCLEAR QT5CLEAR Q
U7TAN LN V21COPY RETURN JFAST
GOSUB PILPRINT COS //LN V2G4IF
LN V2?RETURN COPY CSAVE 1COPY
RETURN JFAST GOSUB PILPRINT C
INPUT JERR MSGS 8COS 9EDIT LN XE
ASN DRNDTAN ACS UNPLOT 6ORNDEO
RND?NEW ?PCOS LN CALL INKEY$C
NEXT TAN YF( AND GOTO PICHAR Y1
ACS CK2Y4ACS DK2ACS EPRINT LN
INT INKEY$EACS ?K2INPUT ?CHAR )2
£UKRND<IF VAL INKEY$LET J4/2LET
KRETURN AS2INPUT ?/QY*( AND
GOTO PI?NEW 3DEF PROC VAL VAL
VAL JACS (ACS (ACS (POP LINE DD
AT CHAR DAT CHAR DGOSUB UNDRAW
£RNDD76:RNDAT Y/(MURNDY5)MTRND
TAN STR$ FAST VAL RETURN
8218 RNDACS AUTO C5LN ( /QE:RND
LN DO PI/CRETURN RNDABS JPI51RND
ACS AUTO C5LN ( /*E:RNDPRINT
LET E:RND?76:RND5TRNDPAT LPRINT
SGN TAN 7PRINT 6:RNDCLEAR QT5UU
RNDXMURNDRETURN 2ATN PUSH PILET
TAN U5RNDRETURN  CTXM5RND/AE£RND
1SAVE 2DQ?FAST LN CALL INKEY$C
CLS LPRINT RETURN CASN ES
RETURN ZC:RETURN D4EACS 0F?O4
CLS ?/INKEY$LN PUSH A/ABS ?LCOS
,LN 5PI<"/PRINT RETURN CALL SD
RETURN ""ACS R AND FPINEW Z5)1
CHAR 4RETURN 5K£RETURN 1C4
RETURN *S4JLN 5PIACS 5PI7/PRINT
NEW ZLN 5PIJ?APIINT F?MCIF LN O
CALL VAL UNDRAW PI)  STR$ FOR 7D
FOR D?+?0FOR KPLOT FOR FOR J?3
LINE ?3?OC/FOR JACS 0ACS 1?+?0
IF DCALL ?+DEF PROC ?0CHAR STOP
;STOP /<>LPRINT AT ACS ?TAB (
INKEY$TAN ERR MSGS ?*>=(INKEY$
FOR ?CCHAR ACS ?TAB (INKEY$TAN
GOSUB OFFMRNDONICLEAR ?RT GOSUB
DELETE /GOSUB DELETE /READ
END PROC GOSUB DELETE K176MRND
ACS WERR MSGS EDIT TAN LN   E-
RND7PRINT LN -DPOKE LN -DPOKE
LN SCHAR LN INPUT DEF PROC INT ?
LN RAUTO LN <>AUTO TAN LN LEN
AUTO YCODE LN RUN DEF PROC LN *
EDIT /$LN RAUTO 5  LN >ERR MSGS
7LN NEXT AUTO FAST LN LEN AUTO
LPRINT LN >ERR MSGS LN A
ERR MSGS LN LLIST A)CLEAR CALL 1
LN IF DEF PROC E?RNDLN INPUT
DEF PROC )RUN CALL 14 LN IF
DEF PROC E?RNDLN INPUT DEF PROC
LN .CHAR LN .CHAR YRUN LN RUN
DEF PROC Y?LN RUN DEF PROC LN
LET DEF PROC RETURN YTAB DRND5
LIST CALL FAST LN ESE?RNDDIM LN
POKE DEF PROC 4CLS INT ?
30455  
30386 DER II ENDAT YTAN ?BDPOKE 6
?RNDGOSUB OFF0RND<5?RNDLN OFF
DPOKE 5  6?RNDE?RND6?RNDLN A
DEF PROC WM5END PROC 5?RNDFAST
LN 7DPOKE LPRINT FAST 7776-RNDU*
RNDM5RNDLN -DPOKE RETURN PAUSE
ATN NEXT ERR MSGS RETURN RAND
ATN CHR$ UNDRAW RETURN IF ATN ,
EDIT RETURN THEN CREM RETURN
DIM ATN JDEF PROC RETURN GOTO
ATN ?DPOKE RETURN GOSUB ATN >
DPOKE RETURN FOR ATN PAUSE
UNDRAW RETURN NEXT ATN 2PROTECT
RETURN SLOW ATN ""AUTO RETURN
POKE ATN VAL UNDRAW RETURN FAST
ATN LAUTO RETURN INPUT ATN Y
PROTECT RETURN PLOT ATN DATA
EDIT RETURN UNPLOT ATN 6EDIT
RETURN LET ATN 2 RETURN CLS ATN
KUNDRAW RETURN STOP ASN £UNDRAW
RETURN PRINT ATN LET DPOKE
RETURN LPRINT ATN CHR$ DPOKE
RETURN NEW ATN 2DPOKE RETURN
COPY ATN UNPLOT ERR MSGS RETURN
REM CPROTECT RETURN SCROLL ATN P
UNDRAW RETURN RETURN ATN $
ERR MSGS RETURN CLEAR ATN A
DEF PROC RETURN  4;E-RND-DPOKE
RETURN
8202 2DEF PROC TAB QERR MSGS LN
£UNDRAW LN LEN AUTO YSLN RUN
DEF PROC ?DRNDLN HTRACE 5=RND?S
UNDRAW 5PUSH A?SUNDRAW 5?7?S
UNDRAW SCROLL RETURN ?4SGN LN
RUN DEF PROC 5/DPOKE LN SUNDRAW
/LEN 1RETURN RETURN GOSUB POP
ACS 1**?POKE DEF PROC UNTIL 7
RESTORE STR$ FOR FAST 67RND6SRND
LN .CHAR LN INPUT DEF PROC JLN
RUN DEF PROC LPRINT LN BREAK
DPOKE ..FOR SGN LN OFFDPOKE
GOSUB OFF?RNDLN OFFDPOKE FAST
GOSUB OFF?RNDBGOSUB DELETE
LPRINT **6?RND?SCROLL CHAR ?7?7
TAN RESTORE 7UNTIL 7TAN FAST AT
E0RND7LN NOSTALGIC DPOKE FOR B
GOSUB PISQR E?RNDGOSUB DELETE **
FOR 7/GOSUB Y?PRINT LN -DPOKE
LN DO PROTECT LN BREAK DPOKE
FOR LN NOSTALGIC DPOKE FOR LET ?
UUNDRAW YLN /DIM FAST SCROLL
RETURN
10249 C5PRINT LN RUN DEF PROC
LET LPRINT TAN VAL FAST E?RND
PRINT ?FAST 76?RNDLN POKE
DEF PROC RETURN D4-Y
52727 LN INPUT DEF PROC JLN RUN
DEF PROC LET A ?LN INPUT
DEF PROC /2LPRINT LET LPRINT AT
JTAN 5CLEAR ACS LN XUNDRAW 51
EXP LN XUNDRAW LN LET DPOKE 5
CLEAR ACS LN XUNDRAW 51:?X
UNDRAW LN -DPOKE RETURN
8198 ERROR LN -DPOKE RETURN
INKEY$CZRETURN
51890 "CYRETURN AT C?RETURN CHR$
ASN >=ERROR RETURN TAB ASN GOTO
ERROR RETURN ,ASN OERROR PRINT E
-RND7LET 1TERROR VAL 1  VAL 1M
TRACE VAL ?CHAR UNDRAW 5INPUT
DEF PROC LN SUNDRAW /RESEQ 5RND
TRACE LN SUNDRAW /7LN LOOP
ERROR 5IF DEF PROC LN SUNDRAW /
CHAR Y?LN BDPOKE E?RNDFAST LN X
UNDRAW 1COPY COPY LN TRACE  7
PRINT LN RUN DEF PROC LET
RETURN "C5LN BDPOKE /INPUT
LPRINT VAL GOSUB OFF?RNDLN OFF
DPOKE Y)LN UUNDRAW Y1LPRINT ?U
UNDRAW LN IUNDRAW LN SQR UNDRAW
5CALL EDIT LN XUNDRAW 5PRINT A
LN SUNDRAW LN -DPOKE RETURN ,C>
RETURN ;ASN CLS DPOKE RETURN +
ASN CLS DPOKE 5.CHAR LN SUNDRAW
JTAN 5XERROR LN SUNDRAW ?CLS
DPOKE 51RNDACS AUTO TAB :"JLN
RUN DEF PROC UTRNDRETURN )S
UNDRAW :(Y/5URND-CHAR ?PRINT A
LN ERR MSGS UNDRAW Y?LN BDPOKE 5
RUN DEF PROC LN SUNDRAW /JLN H
TRACE 5RUN ERROR LN SUNDRAW /8?
NEW 3DEF PROC 51RNDACS AUTO C:5S
RND-ACS COPY LEN WUSR ?A?2DUTRND
CHR$ 5QUNPLOT .CHAR /RY
50167 LN ABS 5IF DEF PROC LN S
UNDRAW ?.ERROR LN NOSTALGIC
DPOKE STR$ LN NOSTALGIC DPOKE
STR$ AT SGN TAN RETURN RNDABS
CONT ERR MSGS 1WRND2LN LINE
CALL RETURN 0SSRETURN RNDKTLN -
DPOKE 7/INPUT RETURN (ME
END PROC C4RETURN $4272SACS
COPY 2LN 6CHAR A ?DDGOSUB
UNDRAW ?RNDDCHAR UEEND PROC
RETURN $CARETURN (42JTAN ?TAN Y1
TAN E4RND91WRNDJMTEND PROC SY
ACS ?4KACS LIST ACS RNDFAST 5T
END PROC OASN CONT ERR MSGS
LPRINT ?FFAST LN SCROLL CHAR
LPRINT 7ACS ?CNEXT J?6DEND PROC
UTEND PROC LN DPEEK CHAR RETURN
14"Y5LN UUNDRAW 5SAVE CHAR LN S
UNDRAW UTEND PROC 55END PROC
ERROR 4S**?TAN EDEND PROC )M 
GOSUB DELETE GOSUB OFF?RNDGOSUB
DELETE SQR INT 6FAST LN
NOSTALGIC DPOKE ?NLPRINT ""
GOSUB OFF1END PROC LN OFFDPOKE )
  LN OFFDPOKE E?RNDGOSUB OFF1
END PROC ;61END PROC 1  ?COS :
LN -DPOKE LN SCHAR RETURN 1ASN
RESEQ RETURN  4SLN DPOKE ACOPY
FAST LN -DPOKE RETURN =TAB CONT
ERR MSGS LN HTRACE LPRINT ?
RETURN COPY 4£5SGN FOR LN X
UNDRAW 5OFFDPOKE ?SUNDRAW Y6?U
UNDRAW FAST 5NOSTALGIC TRACE LN
SUNDRAW LN -DPOKE LN LINE CALL
RETURN (46LPRINT LN ** 5STR$
VAL LN XUNDRAW 5DUP DEF PROC LN
SUNDRAW LN -DPOKE LN 3 5AT SGN
LN XUNDRAW 5?DEF PROC ?SUNDRAW
LN -DPOKE LN 3 LPRINT Y5LN U
UNDRAW 5?TRACE ?SUNDRAW I+FAST
LN -DPOKE RETURN (CRAND RETURN "
45LN LOOP ERROR /END WHEN
RETURN INKEY$4A5RNDTRACE LN S
UNDRAW /USER RETURN CHR$ 4"LN
ERR MSGS UNDRAW 5UTRACE LN S
UNDRAW /DELETE LN ABS /EDIT LN
SCHAR LN -DPOKE FAST LN LINE
CALL RETURN (4NLN -DPOKE LN H
TRACE E-RNDDATA LOOP LN XUNDRAW
/"LN -DPOKE RETURN TO TAB CONT
ERR MSGS LN OUNDRAW 5AUTO TRACE
LN SUNDRAW LPRINT Y5LN UUNDRAW 5
WHILE TRACE ?SUNDRAW LPRINT Y5
LN UUNDRAW 5HCHAR ?SUNDRAW 5
LINE TRACE LN SUNDRAW LN LINE
CALL RETURN )CDLPRINT X""LN -
DPOKE ?5 LN -DPOKE /FOR ?11 /D
LN POKE DEF PROC 1  GCOS £)D
END PROC >TAN B.GOSUB DELETE
ERR MSGS EDIT LIST INT FSTR$ LN
NOSTALGIC DPOKE FOR SGN ;FOR
TAN E1END PROC 65END PROC TAN ?L
COS E5END PROC FOR GOSUB KGOSUB
DO 5END PROC TAN FAST E5
END PROC GOSUB OFF1END PROC B
GOSUB DELETE FAST AT LPRINT LN
NOSTALGIC DPOKE VAL FAST LN ?
DEF PROC LPRINT AT ?7?TAN FOR TA
?RETURN  C1ACS  DRAW ?FOR 5  
ACS T3K1;FOR DFOR (PRINT TAN J
PRINT LN ERR MSGS UNDRAW LN
LINE CALL RETURN + AND RNDDRAW
RETURN ;ABS RNDDRAW YFAST LN B
DPOKE LN -DPOKE PRINT LN
ERR MSGS UNDRAW LET RETURN +C4
RETURN -47AT LINE ?RETURN  44
PRINT FAST /PEEK FAST 5ERR MSGS
EDIT LN XUNDRAW LN NEXT TRACE Y
FAST 5PUSH NOSTALGIC LN UUNDRAW
/ZPRINT VAL /0RETURN /C(RETURN *
TAB CONT ERR MSGS LN VDRAW 5)
TRACE LN SUNDRAW /BLN VDRAW 5
CLEAR DEF PROC /NEXT YLPRINT LN
BDPOKE LET RETURN  COS RETURN +C
)LN VDRAW 5BFOR LN XUNDRAW 5
GOSUB DELETE LN XUNDRAW /SCROLL
LN VDRAW Y;LN BDPOKE /<>YSGN ?B
DPOKE RETURN )4USR LN -DPOKE /
INT RETURN PEEK 4?LN ERR MSGS
UNDRAW 5A ?XUNDRAW RETURN USR 4>
LN ERR MSGS UNDRAW 5PUSH DRAW ?S
UNDRAW 1?DRAW VAL FAST TAN
NOSTALGIC PUSH TAN RETURN CODE 4
G55END PROC YELN UUNDRAW YFAST
LN BDPOKE ICOPY LN 5 YSGN LN B
DPOKE 5>DRAW /USR E5END PROC
GOSUB DO 5END PROC JGOSUB
DELETE LINE ?COS ,?TAN RETURN
RND455ARND/VRETURN ABS 4)LN
ERR MSGS UNDRAW 5ACS ?LN X
UNDRAW YCODE 5?UNDRAW ?UUNDRAW
RETURN INT ASN ERR MSGS UNDRAW
RETURN LEN 4,LN -DPOKE LN SCHAR
LN -DPOKE Y5LN UUNDRAW 5>=DRAW /
F77LN NOSTALGIC DPOKE FOR TAN
RETURN SGN 4+LN ERR MSGS UNDRAW
5LIST DRAW ?SUNDRAW ?PCOS ACS ?5
1 TAB ?UNDRAW TAN RETURN SQR
TAB CONT ERR MSGS LN ERR MSGS
UNDRAW 5SUNDRAW ?SUNDRAW JXACS ?
C2INT G?ELSE A )RND TAGOSUB
DELETE K1;ZACS >EGOSUB
CLR STACK EGOSUB CLR STACK (
LIST CLR STACK LINE TAN LN H
TRACE LN -DPOKE PRINT YFAST LN B
DPOKE LN HTRACE YSGN LN BDPOKE
LET TAN LN -DPOKE RETURN -PRINT
ATN -DPOKE RETURN (C-RETURN RNDK
$RETURN AUSR ?UNDRAW >=8UNDRAW
LET ATN ELSE UNDRAW TAN LN
TRACE DRAW /PLOT LN HTRACE /LET
5?UNDRAW /CHAR ?JLINE ?J?7TAN
LN SCHAR RETURN  ASN >DEF PROC Y
E/PLN DO PROTECT Y5/I)(BLN A
DPOKE LN $ERR MSGS U5END PROC
DEF PROC £E?RND6?RNDT4LN BDPOKE
(CLS $4PLOT LPRINT GOSUB UNDRAW
?RNDTAN 5ES/75"RNDYLN LN BDPOKE
?LN BDPOKE ??BDPOKE LN IUNDRAW
LN SQR UNDRAW 5FOR ?/GOSUB
RETURN ,TAB CONT ERR MSGS TAN
LN LINE CALL RETURN
10245 TRACE /AYE5ORNDLN UUNDRAW Y
65MRND?UUNDRAW LN -DPOKE LN S
CHAR FAST FAST LN -DPOKE LN I
UNDRAW Y7LN BDPOKE 5GOSUB DO LN
XUNDRAW LPRINT LN XUNDRAW Y677
LN UUNDRAW LPRINT GOSUB OFF?RND?
OFFDPOKE LN -DPOKE LN SCHAR
FAST FAST YELN UUNDRAW 576LN X
UNDRAW LPRINT LN XUNDRAW 77Y
GOSUB LN BDPOKE YOFFLN UUNDRAW Y
B5GOSUB DELETE LN UUNDRAW YIF
LPRINT LN NOSTALGIC DPOKE FOR ?U
UNDRAW 5  /?LN -DPOKE RETURN  
LN )TRACE LET RETURN AABS CONT
ERR MSGS RETURN 0 AND CONT
ERR MSGS CHR$ 0T DEF PROC D/ TO
FAST E-RND)5 ;6-RNDLPRINT TAN
LN -DPOKE LN SCHAR RETURN 1C1
PRINT FAST 5*EDIT LN SUNDRAW
LPRINT LET RETURN  TAB EXIT Y
FOR LN BDPOKE LN SUNDRAW Y5LN U
UNDRAW LN -DPOKE 5VPROTECT ?S
UNDRAW GOSUB UNDRAW 1END PROC
VAL FAST LN 2EDIT 61END PROC
FAST LN PAUSE PROTECT RETURN
10249 KPRINT LN $EDIT /LIST SGN
GOSUB DELETE FAST AT LPRINT LN 6
TRACE AT GOSUB CALL 1END PROC
FAST LN 2EDIT 1LN ?DEF PROC
LPRINT TAN FAST LN LET DEF PROC
LPRINT RETURN ?""J?FY
48672 £RND1SAVE 2DYL?TAN ?7Y
48672 /PAUSE LN 2EDIT FAST FAST
LN PAUSE PROTECT RETURN
10257 CARETURN 0SLET RETURN AK
GOSUB LN $EDIT /CONT 5  SGN ,
RETURN -C(RETURN LC?CHR$ 0DFAST
DDAT DT DEF PROC D</CONT SGN ,
RETURN -PRINT LN NEW PROTECT
LET ""??UNDRAW Y.PRINT LN I
UNDRAW LN SQR UNDRAW 5UNDRAW
DPOKE LN XUNDRAW YYLN BDPOKE
LET LN BDPOKE YM5KRNDLN UUNDRAW
5,RND?SUNDRAW Y4/**?PCOS ?NCOS R
TAN ?PC2RTAN ?NCOS RTAN E-RND7(C
PLOT RETURN INKEY$ASN ERR MSGS
AUTO RETURN CHR$ ASN ERR MSGS
AUTO RETURN "ASN ERR MSGS AUTO 7
LN IUNDRAW RETURN OR 4S5?EDIT
LN SUNDRAW YABS /CHAR RETURN
AND 455EEDIT /LIST PRINT YB5
GOSUB DELETE LN UUNDRAW LET
RETURN =44YTAB /GRETURN <>44Y
ASN /8RETURN >C+RETURN <4EYASN
LN 5AUTO /<RETURN >=4S5C7LN X
UNDRAW YPAUSE /ERETURN <=TAB
CONT ERR MSGS YIF LN 5AUTO LN -
DPOKE RETURN AND ASN ,EDIT TAN
LN BDPOKE ESRND7LN BREAK DPOKE
FOR LN NOSTALGIC DPOKE FOR ?X
UNDRAW LN XAUTO 65END PROC 6E
END PROC TAN E5END PROC QCOPY 7
TAN 5NOSTALGIC TRACE LN SUNDRAW
LN 3 LN -DPOKE PRINT 5NAUTO LN S
UNDRAW LN 3 5XAUTO LN SUNDRAW 52
AUTO LN SUNDRAW LET RETURN =44Y
TAB /ARETURN <>44YASN /2RETURN >
4EYASN LN 5AUTO /ARETURN <C<
RETURN >=44Y AND /ERETURN <=TAB
CONT ERR MSGS 5C7LN XUNDRAW Y
ABS ?+AUTO EEEND PROC GOSUB
UNDRAW 1END PROC SWOY""RETURN  
COS 77/POKE 5RAUTO ?SUNDRAW LN
SCROLL 25VRNDACS QTAN 5LEN AUTO
?SUNDRAW 5VRNDACS PLOT ?E252 LN
**D""FAST LN 2DEF PROC SGN ?
DATA S52 LN **D""LN 2DEF PROC
COS LN 2DEF PROC COS LOOP DATA E
£RND/SCROLL 777VAL 7777VAL LN
EXP AUTO 57 LN **DAT LN 2D7Y
28963 7AT ?7?7QREM 7?7?7TAN 77
AUTO 7ERROR D7U£RND1""U$RND0TAN
LN -DPOKE LN SCHAR Y5LN UUNDRAW
YGOSUB LN BDPOKE YOFF51END PROC
LN UUNDRAW 5OFFDPOKE LN SUNDRAW
LN HTRACE 5UNTIL DEF PROC ?S
UNDRAW 7D7FAST FAST AT E1
END PROC LN COS :AT LN DUP
DEF PROC GOSUB DO 1END PROC TAN
E1END PROC DATA LOOP <Q /7E1
END PROC ?LCOS GOSUB KTAN FAST
LN ERR MSGS UNDRAW 5GOSUB
UNDRAW LN XUNDRAW LPRINT LN X
UNDRAW 5DD?XUNDRAW LN DPOKE 5
NOSTALGIC DPOKE LN SUNDRAW 5FOR
SGN ?XUNDRAW E4RND9QCOPY FQCOPY
FQ 6DEND PROC Y5E?RNDLN UUNDRAW
I:U5END PROC LINE LN XUNDRAW 5
ATN DEF PROC ?SUNDRAW £JM5RNDT4?
7(UNPLOT $4RUN 54 6?RNDE0RND1
HOME  D61END PROC 65END PROC
TAN ?HRND?:RND?)RND?1RND?4RND
FOR ?7RND POP    POP
 125 
   2 REM 5?RNDFAST 6?RND77AUTO 7
ERROR D777AUTO 7ERROR D777AUTO 7
ERROR D7SGN BGOSUB DELETE 6?RND
FOR E4RND?7?7FOR E?RNDGOSUB
UNDRAW ?RNDGOSUB KJTAN LN
SCROLL 25VRNDACS QI?FAST E4RND
AUTO 7ERROR LPRINT FAST VAL LN 7
DE4RND77AT SGN GOSUB KJTAN ?RND 
 ?     5WRNDJY7FOR BGOSUB
DELETE FOR ABS ?END PROC T 
DEF PROC TAN     
   3 REM       MCODER II        
 COPYRIGHT 1983   D C THRELFALL 
COMPILER AT 17300 PROG AT 20500
  10 REM BY:STEVEN L. REID <SLR>
          (DESIGNED)1983        
        <<<<THE BALL>>>>
  20 PRINT "THE BALL<BY:STEVEN R
EID(C)1983>"
  30 PRINT "                    
            "
  40 FOR A=2 TO 20
  50 PRINT " ";TAB 10;"    AAAAH
HHHAAHH  ";TAB 31;" "
  60 NEXT A
  70 PRINT "                    
            ";
  80 LET B=0
  90 LET H=-1
 100 LET V=1
 110 LET X=20
 120 LET Y=1
 130 LET C=X
 140 LET U=Y
 150 LET A$=" "
 160 LET B$=" "
 170 LET J=1
 180 IF X<>C THEN PRINT AT C,U;B
$
 190 IF Y<>U THEN PRINT AT C,U;B
$
 200 PRINT AT X,Y;A$
 210 REM **CHECK COLOR**
 220 IF B=1 THEN GOSUB 1000
 230 IF B=0 THEN GOSUB 2000
 240 REM **MOVEMENT**
 250 LET C=X
 260 LET U=Y
 270 LET X=X+H
 280 LET Y=Y+V
 290 IF X=2 THEN LET H=-H
 300 IF X=20 THEN LET H=-H
 310 IF Y=1 THEN LET V=-V
 320 IF Y=30 THEN LET V=-V
 330 IF J=30 THEN LET B=1
 340 IF B=1 THEN GOTO 370
 350 LET J=J+1
 360 GOTO 400
 370 LET J=J-1
 380 IF J=1 THEN LET B=0
 390 REM **GOTO START**
 400 IF INKEY$="Q" THEN GOTO 350
0
 410 GOSUB 3000
 420 GOTO 180
1000 REM **CHECK COLOR - 1**
1010 IF J=28 THEN LET A$=" "
1020 IF J=27 THEN LET B$=" "
1030 IF J=26 THEN LET A$="A"
1040 IF J=25 THEN LET B$="H"
1050 IF J=24 THEN LET A$="H"
1060 IF J=23 THEN LET B$="A"
1070 IF J=22 THEN LET A$="A"
1080 IF J=21 THEN LET B$="H"
1090 IF J=18 THEN LET A$="H"
1100 IF J=17 THEN LET B$="A"
1110 IF J=14 THEN LET A$=" "
1120 IF J=13 THEN LET B$=" "
1130 IF J=10 THEN LET A$=" "
1140 IF J=9 THEN LET B$=" "
1150 RETURN
2000 REM **CHECK COLOR - 0**
2010 IF J=9 THEN LET A$=" "
2020 IF J=10 THEN LET B$=" "
2030 IF J=13 THEN LET A$="H"
2040 IF J=14 THEN LET B$="A"
2050 IF J=17 THEN LET A$="A"
2060 IF J=18 THEN LET B$="H"
2070 IF J=21 THEN LET A$="H"
2080 IF J=22 THEN LET B$="A"
2090 IF J=23 THEN LET A$="A"
2100 IF J=24 THEN LET B$="H"
2110 IF J=25 THEN LET A$=" "
2120 IF J=26 THEN LET B$=" "
2130 IF J=27 THEN LET A$=" "
2140 IF J=28 THEN LET B$=" "
2150 RETURN
3000 REM **START MCODER?**
3010 IF S=0 THEN RETURN
3020 LET S=S-1
3030 IF S>0 THEN RETURN
3040 PRINT AT 2,1;"WAIT...";AT 3
,3;"THIS CAN BE";AT 4,5;"MUCH FA
STER*";
3050 FOR W=1 TO 100
3060 NEXT W
3500 CLS
3510 LET L=USR 20500
3520 CLS
3530 GOTO 10
3990 STOP
4000 SAVE "BALLMC"
4010 LET S=65
4020 GOTO 10
4030 REM * THE   BALL   REDUX * 
         * SLR 1983/2012/2014 *