eug_titles/PT3/PTDemo

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This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.

Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.

Tape/disk:	Home » Personal collection » Acorn hard disk » misc » misc3
Filename:	eug_titles/PT3/PTDemo
Read OK:	✔
File size:	0997 bytes
Load address:	0000
Exec address:	0000

Duplicates

There are 4 duplicate copies of this file in the archive:

AEW website » eug » eug_5_25_discs_Eug-38_D-EUG38.dsd » U.PTDEM
Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_38.ADF » PTDemo
Personal collection » Acorn ADFS disks » Electron » EUG_submission.ADF » PT3/PTDemo
Personal collection » Acorn hard disk » misc » misc3 » eug_titles/PT3/PTDemo
Personal collection » Acorn hard disk » zipped_disks » elk03 » eug38/PTDemo

File contents

   10 REM Programming Technique Demo                Part 3: Screen Memory                Written by Dominic Ford 1998
   20 :
   30 REM Program Layout
   40 REM  100 - Main menu system
   50 REM 1000 - Slow plotting system
  100 REM Main menu
  110 REPEAT
  120 MODE 6:PRINT"       Programming Technique Demo                Part 3: Screen Memory                Written by Dominic Ford 1998"
  130 PRINT'"Please select:"''"1. Saving screen memory."'"2. Quit!"'''''"Sorry - the user defined character"'"demonstrations and the module for"'"multi-coloured characters are still in"
  140 PRINT"progress. They will form part of a more"'"substancial feature on characters next"'"issue."
  150 REPEAT:key$=GET$:UNTIL INSTR("12",key$)<>0
  160 IF key$="1" THEN MODE 4:PROCcad
  170 UNTIL key$="2"
  180 MODE 6:END
 1000 REM Module to draw CAD view of J3
 1010 :
 1020 DEFPROCcad
 1030 PRINT"ShipWrecked II: Jupiter 3 CAD View"
 1040 PRINT"=================================="
 1050 PRINT'"This is the graphics routine which I"'"used when producing the CAD View of"'"Jupiter 3 for the Shipwrecked II"'"instructions file. It takes quite a"'"while to calculate, and yet by saving"'"screen memory, it appears near"
 1060 PRINT"instantaneously on your screen in the"'"instruction system. This demonstration"'"will show how the picture is slowly"'"built up before being saved."'
 1070 PRINT"Press ESCAPE to quit plotting early, or"'"SPACE to return to the main menu after"'"plotting has finished (a bell rings to"'"indicate plotting is complete)"'''"Press <SPACE> to start"
 1080 REPEAT UNTIL INKEY(-99)
 1090 :
 1100 REM Set up screen (colour scheme +text)
 1110CLS:VDU19,1,2,0;0;0;0;:x=0:xo=0
 1120VDU23,1,0;0;0;0;:PRINTTAB(9,1)"CAD View of Jupiter 3";TAB(9,2)"---------------------";TAB(0,5)"Navigation";TAB(2,6)"Area";TAB(10,25)"Control      Tourist";TAB(11,26)"Disc         Disc";TAB(32,24)"Docking";TAB(34,25)"Bay"
 1140:
 1150 REM Plot main body of J3 (using rather unpleasant trigonometry!)
 1160FORtheta=0TO360STEP15:FORalpha=-20TO270STEP5
 1170IF alpha>160 THEN x=25 ELSE x=0
 1180IF alpha<181 THEN stat=TRUE ELSE stat=FALSE
 1190IF stat THEN MOVE550-xo-(alpha-5)*2+COS(theta*PI/180)*50,FNy(theta,alpha-5)
 1200IF stat THEN DRAW550-x-alpha*2+COS(theta*PI/180)*50,FNy(theta,alpha)
 1210IF stat AND ((alpha MOD 45)=0 OR alpha=-20) THEN DRAW550-x-alpha*2+COS((theta-30)*PI/180)*50,FNy(theta-30,alpha)
 1220MOVE650+(alpha-5)*2+COS(theta*PI/180)*50,FNy(theta,alpha-5)
 1230DRAW650+alpha*2+COS(theta*PI/180)*50,FNy(theta,alpha)
 1240IF (alpha MOD 45)=0 THEN DRAW650+alpha*2+COS((theta-30)*PI/180)*50,FNy(theta-30,alpha)
 1250xo=x:NEXT:xo=0:NEXT
 1260:
 1270 REM Beep and wait for space
 1280PRINTTAB(7,30)"Press <SPACE> to continue"
 1290VDU7:REPEAT UNTIL INKEY(-99)
 1300ENDPROC
 1310:
 1320DEFFNy(th,al)=600+250*SIN(th*PI/180)*SIN(al*PI/180)


r � Programming Technique Demo                Part 3: Screen Memory                Written by Dominic Ford 1998
 :
 � Program Layout
( �  100 - Main menu system
2" � 1000 - Slow plotting system
d � Main menu
n �
x~ � 6:�"       Programming Technique Demo                Part 3: Screen Memory                Written by Dominic Ford 1998"
�� �'"Please select:"''"1. Saving screen memory."'"2. Quit!"'''''"Sorry - the user defined character"'"demonstrations and the module for"'"multi-coloured characters are still in"
�a �"progress. They will form part of a more"'"substancial feature on characters next"'"issue."
� �:key$=�:� �"12",key$)<>0
� � key$="1" � � 4:�cad
� � key$="2"
�
 � 6:�
�$ � Module to draw CAD view of J3
� :
�
 ��cad
* �"ShipWrecked II: Jupiter 3 CAD View"
* �"=================================="
� �'"This is the graphics routine which I"'"used when producing the CAD View of"'"Jupiter 3 for the Shipwrecked II"'"instructions file. It takes quite a"'"while to calculate, and yet by saving"'"screen memory, it appears near"
$� �"instantaneously on your screen in the"'"instruction system. This demonstration"'"will show how the picture is slowly"'"built up before being saved."'
.� �"Press ESCAPE to quit plotting early, or"'"SPACE to return to the main menu after"'"plotting has finished (a bell rings to"'"indicate plotting is complete)"'''"Press <SPACE> to start"
8 � � �(-99)
B :
L* � Set up screen (colour scheme +text)
V�:�19,1,2,0;0;0;0;:x=0:xo=0
`��23,1,0;0;0;0;:�9,1)"CAD View of Jupiter 3";�9,2)"---------------------";�0,5)"Navigation";�2,6)"Area";�10,25)"Control      Tourist";�11,26)"Disc         Disc";�32,24)"Docking";�34,25)"Bay"
t:
~C � Plot main body of J3 (using rather unpleasant trigonometry!)
�$�theta=0�360�15:�alpha=-20�270�5
�� alpha>160 � x=25 � x=0
�!� alpha<181 � stat=� � stat=�
�D� stat � �550-xo-(alpha-5)*2+�(theta*�/180)*50,�y(theta,alpha-5)
�=� stat � �550-x-alpha*2+�(theta*�/180)*50,�y(theta,alpha)
�d� stat � ((alpha � 45)=0 � alpha=-20) � �550-x-alpha*2+�((theta-30)*�/180)*50,�y(theta-30,alpha)
�8�650+(alpha-5)*2+�(theta*�/180)*50,�y(theta,alpha-5)
�2�650+alpha*2+�(theta*�/180)*50,�y(theta,alpha)
�M� (alpha � 45)=0 � �650+alpha*2+�((theta-30)*�/180)*50,�y(theta-30,alpha)
�xo=x:�:xo=0:�
�:
� � Beep and wait for space
&�7,30)"Press <SPACE> to continue"

�7:� � �(-99)
�
:
(.ݤy(th,al)=600+250*�(th*�/180)*�(al*�/180)
�

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00000010  6e 67 20 54 65 63 68 6e  69 71 75 65 20 44 65 6d  |ng Technique Dem|
00000020  6f 20 20 20 20 20 20 20  20 20 20 20 20 20 20 20  |o               |
00000030  20 50 61 72 74 20 33 3a  20 53 63 72 65 65 6e 20  | Part 3: Screen |
00000040  4d 65 6d 6f 72 79 20 20  20 20 20 20 20 20 20 20  |Memory          |
00000050  20 20 20 20 20 20 57 72  69 74 74 65 6e 20 62 79  |      Written by|
00000060  20 44 6f 6d 69 6e 69 63  20 46 6f 72 64 20 31 39  | Dominic Ford 19|
00000070  39 38 0d 00 14 06 20 3a  0d 00 1e 15 20 f4 20 50  |98.... :.... . P|
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00000090  1e 20 f4 20 20 31 30 30  20 2d 20 4d 61 69 6e 20  |. .  100 - Main |
000000a0  6d 65 6e 75 20 73 79 73  74 65 6d 0d 00 32 22 20  |menu system..2" |
000000b0  f4 20 31 30 30 30 20 2d  20 53 6c 6f 77 20 70 6c  |. 1000 - Slow pl|
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000000d0  10 20 f4 20 4d 61 69 6e  20 6d 65 6e 75 0d 00 6e  |. . Main menu..n|
000000e0  06 20 f5 0d 00 78 7e 20  eb 20 36 3a f1 22 20 20  |. ...x~ . 6:."  |
000000f0  20 20 20 20 20 50 72 6f  67 72 61 6d 6d 69 6e 67  |     Programming|
00000100  20 54 65 63 68 6e 69 71  75 65 20 44 65 6d 6f 20  | Technique Demo |
00000110  20 20 20 20 20 20 20 20  20 20 20 20 20 20 20 50  |               P|
00000120  61 72 74 20 33 3a 20 53  63 72 65 65 6e 20 4d 65  |art 3: Screen Me|
00000130  6d 6f 72 79 20 20 20 20  20 20 20 20 20 20 20 20  |mory            |
00000140  20 20 20 20 57 72 69 74  74 65 6e 20 62 79 20 44  |    Written by D|
00000150  6f 6d 69 6e 69 63 20 46  6f 72 64 20 31 39 39 38  |ominic Ford 1998|
00000160  22 0d 00 82 b4 20 f1 27  22 50 6c 65 61 73 65 20  |".... .'"Please |
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00000180  76 69 6e 67 20 73 63 72  65 65 6e 20 6d 65 6d 6f  |ving screen memo|
00000190  72 79 2e 22 27 22 32 2e  20 51 75 69 74 21 22 27  |ry."'"2. Quit!"'|
000001a0  27 27 27 27 22 53 6f 72  72 79 20 2d 20 74 68 65  |''''"Sorry - the|
000001b0  20 75 73 65 72 20 64 65  66 69 6e 65 64 20 63 68  | user defined ch|
000001c0  61 72 61 63 74 65 72 22  27 22 64 65 6d 6f 6e 73  |aracter"'"demons|
000001d0  74 72 61 74 69 6f 6e 73  20 61 6e 64 20 74 68 65  |trations and the|
000001e0  20 6d 6f 64 75 6c 65 20  66 6f 72 22 27 22 6d 75  | module for"'"mu|
000001f0  6c 74 69 2d 63 6f 6c 6f  75 72 65 64 20 63 68 61  |lti-coloured cha|
00000200  72 61 63 74 65 72 73 20  61 72 65 20 73 74 69 6c  |racters are stil|
00000210  6c 20 69 6e 22 0d 00 8c  61 20 f1 22 70 72 6f 67  |l in"...a ."prog|
00000220  72 65 73 73 2e 20 54 68  65 79 20 77 69 6c 6c 20  |ress. They will |
00000230  66 6f 72 6d 20 70 61 72  74 20 6f 66 20 61 20 6d  |form part of a m|
00000240  6f 72 65 22 27 22 73 75  62 73 74 61 6e 63 69 61  |ore"'"substancia|
00000250  6c 20 66 65 61 74 75 72  65 20 6f 6e 20 63 68 61  |l feature on cha|
00000260  72 61 63 74 65 72 73 20  6e 65 78 74 22 27 22 69  |racters next"'"i|
00000270  73 73 75 65 2e 22 0d 00  96 1e 20 f5 3a 6b 65 79  |ssue.".... .:key|
00000280  24 3d be 3a fd 20 a7 22  31 32 22 2c 6b 65 79 24  |$=.:. ."12",key$|
00000290  29 3c 3e 30 0d 00 a0 1a  20 e7 20 6b 65 79 24 3d  |)<>0.... . key$=|
000002a0  22 31 22 20 8c 20 eb 20  34 3a f2 63 61 64 0d 00  |"1" . . 4:.cad..|
000002b0  aa 0f 20 fd 20 6b 65 79  24 3d 22 32 22 0d 00 b4  |.. . key$="2"...|
000002c0  0a 20 eb 20 36 3a e0 0d  03 e8 24 20 f4 20 4d 6f  |. . 6:....$ . Mo|
000002d0  64 75 6c 65 20 74 6f 20  64 72 61 77 20 43 41 44  |dule to draw CAD|
000002e0  20 76 69 65 77 20 6f 66  20 4a 33 0d 03 f2 06 20  | view of J3.... |
000002f0  3a 0d 03 fc 0a 20 dd f2  63 61 64 0d 04 06 2a 20  |:.... ..cad...* |
00000300  f1 22 53 68 69 70 57 72  65 63 6b 65 64 20 49 49  |."ShipWrecked II|
00000310  3a 20 4a 75 70 69 74 65  72 20 33 20 43 41 44 20  |: Jupiter 3 CAD |
00000320  56 69 65 77 22 0d 04 10  2a 20 f1 22 3d 3d 3d 3d  |View"...* ."====|
00000330  3d 3d 3d 3d 3d 3d 3d 3d  3d 3d 3d 3d 3d 3d 3d 3d  |================|
00000340  3d 3d 3d 3d 3d 3d 3d 3d  3d 3d 3d 3d 3d 3d 22 0d  |==============".|
00000350  04 1a e5 20 f1 27 22 54  68 69 73 20 69 73 20 74  |... .'"This is t|
00000360  68 65 20 67 72 61 70 68  69 63 73 20 72 6f 75 74  |he graphics rout|
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000003a0  66 22 27 22 4a 75 70 69  74 65 72 20 33 20 66 6f  |f"'"Jupiter 3 fo|
000003b0  72 20 74 68 65 20 53 68  69 70 77 72 65 63 6b 65  |r the Shipwrecke|
000003c0  64 20 49 49 22 27 22 69  6e 73 74 72 75 63 74 69  |d II"'"instructi|
000003d0  6f 6e 73 20 66 69 6c 65  2e 20 49 74 20 74 61 6b  |ons file. It tak|
000003e0  65 73 20 71 75 69 74 65  20 61 22 27 22 77 68 69  |es quite a"'"whi|
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00000460  22 27 22 69 6e 73 74 72  75 63 74 69 6f 6e 20 73  |"'"instruction s|
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00000480  6e 73 74 72 61 74 69 6f  6e 22 27 22 77 69 6c 6c  |nstration"'"will|
00000490  20 73 68 6f 77 20 68 6f  77 20 74 68 65 20 70 69  | show how the pi|
000004a0  63 74 75 72 65 20 69 73  20 73 6c 6f 77 6c 79 22  |cture is slowly"|
000004b0  27 22 62 75 69 6c 74 20  75 70 20 62 65 66 6f 72  |'"built up befor|
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000004d0  0d 04 2e bd 20 f1 22 50  72 65 73 73 20 45 53 43  |.... ."Press ESC|
000004e0  41 50 45 20 74 6f 20 71  75 69 74 20 70 6c 6f 74  |APE to quit plot|
000004f0  74 69 6e 67 20 65 61 72  6c 79 2c 20 6f 72 22 27  |ting early, or"'|
00000500  22 53 50 41 43 45 20 74  6f 20 72 65 74 75 72 6e  |"SPACE to return|
00000510  20 74 6f 20 74 68 65 20  6d 61 69 6e 20 6d 65 6e  | to the main men|
00000520  75 20 61 66 74 65 72 22  27 22 70 6c 6f 74 74 69  |u after"'"plotti|
00000530  6e 67 20 68 61 73 20 66  69 6e 69 73 68 65 64 20  |ng has finished |
00000540  28 61 20 62 65 6c 6c 20  72 69 6e 67 73 20 74 6f  |(a bell rings to|
00000550  22 27 22 69 6e 64 69 63  61 74 65 20 70 6c 6f 74  |"'"indicate plot|
00000560  74 69 6e 67 20 69 73 20  63 6f 6d 70 6c 65 74 65  |ting is complete|
00000570  29 22 27 27 27 22 50 72  65 73 73 20 3c 53 50 41  |)"'''"Press <SPA|
00000580  43 45 3e 20 74 6f 20 73  74 61 72 74 22 0d 04 38  |CE> to start"..8|
00000590  0f 20 f5 20 fd 20 a6 28  2d 39 39 29 0d 04 42 06  |. . . .(-99)..B.|
000005a0  20 3a 0d 04 4c 2a 20 f4  20 53 65 74 20 75 70 20  | :..L* . Set up |
000005b0  73 63 72 65 65 6e 20 28  63 6f 6c 6f 75 72 20 73  |screen (colour s|
000005c0  63 68 65 6d 65 20 2b 74  65 78 74 29 0d 04 56 1f  |cheme +text)..V.|
000005d0  db 3a ef 31 39 2c 31 2c  32 2c 30 3b 30 3b 30 3b  |.:.19,1,2,0;0;0;|
000005e0  30 3b 3a 78 3d 30 3a 78  6f 3d 30 0d 04 60 c2 ef  |0;:x=0:xo=0..`..|
000005f0  32 33 2c 31 2c 30 3b 30  3b 30 3b 30 3b 3a f1 8a  |23,1,0;0;0;0;:..|
00000600  39 2c 31 29 22 43 41 44  20 56 69 65 77 20 6f 66  |9,1)"CAD View of|
00000610  20 4a 75 70 69 74 65 72  20 33 22 3b 8a 39 2c 32  | Jupiter 3";.9,2|
00000620  29 22 2d 2d 2d 2d 2d 2d  2d 2d 2d 2d 2d 2d 2d 2d  |)"--------------|
00000630  2d 2d 2d 2d 2d 2d 2d 22  3b 8a 30 2c 35 29 22 4e  |-------";.0,5)"N|
00000640  61 76 69 67 61 74 69 6f  6e 22 3b 8a 32 2c 36 29  |avigation";.2,6)|
00000650  22 41 72 65 61 22 3b 8a  31 30 2c 32 35 29 22 43  |"Area";.10,25)"C|
00000660  6f 6e 74 72 6f 6c 20 20  20 20 20 20 54 6f 75 72  |ontrol      Tour|
00000670  69 73 74 22 3b 8a 31 31  2c 32 36 29 22 44 69 73  |ist";.11,26)"Dis|
00000680  63 20 20 20 20 20 20 20  20 20 44 69 73 63 22 3b  |c         Disc";|
00000690  8a 33 32 2c 32 34 29 22  44 6f 63 6b 69 6e 67 22  |.32,24)"Docking"|
000006a0  3b 8a 33 34 2c 32 35 29  22 42 61 79 22 0d 04 74  |;.34,25)"Bay"..t|
000006b0  05 3a 0d 04 7e 43 20 f4  20 50 6c 6f 74 20 6d 61  |.:..~C . Plot ma|
000006c0  69 6e 20 62 6f 64 79 20  6f 66 20 4a 33 20 28 75  |in body of J3 (u|
000006d0  73 69 6e 67 20 72 61 74  68 65 72 20 75 6e 70 6c  |sing rather unpl|
000006e0  65 61 73 61 6e 74 20 74  72 69 67 6f 6e 6f 6d 65  |easant trigonome|
000006f0  74 72 79 21 29 0d 04 88  24 e3 74 68 65 74 61 3d  |try!)...$.theta=|
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00000720  6c 70 68 61 3e 31 36 30  20 8c 20 78 3d 32 35 20  |lpha>160 . x=25 |
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00000740  3c 31 38 31 20 8c 20 73  74 61 74 3d b9 20 8b 20  |<181 . stat=. . |
00000750  73 74 61 74 3d a3 0d 04  a6 44 e7 20 73 74 61 74  |stat=....D. stat|
00000760  20 8c 20 ec 35 35 30 2d  78 6f 2d 28 61 6c 70 68  | . .550-xo-(alph|
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00000790  61 2c 61 6c 70 68 61 2d  35 29 0d 04 b0 3d e7 20  |a,alpha-5)...=. |
000007a0  73 74 61 74 20 8c 20 df  35 35 30 2d 78 2d 61 6c  |stat . .550-x-al|
000007b0  70 68 61 2a 32 2b 9b 28  74 68 65 74 61 2a af 2f  |pha*2+.(theta*./|
000007c0  31 38 30 29 2a 35 30 2c  a4 79 28 74 68 65 74 61  |180)*50,.y(theta|
000007d0  2c 61 6c 70 68 61 29 0d  04 ba 64 e7 20 73 74 61  |,alpha)...d. sta|
000007e0  74 20 80 20 28 28 61 6c  70 68 61 20 83 20 34 35  |t . ((alpha . 45|
000007f0  29 3d 30 20 84 20 61 6c  70 68 61 3d 2d 32 30 29  |)=0 . alpha=-20)|
00000800  20 8c 20 df 35 35 30 2d  78 2d 61 6c 70 68 61 2a  | . .550-x-alpha*|
00000810  32 2b 9b 28 28 74 68 65  74 61 2d 33 30 29 2a af  |2+.((theta-30)*.|
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00000830  61 2d 33 30 2c 61 6c 70  68 61 29 0d 04 c4 38 ec  |a-30,alpha)...8.|
00000840  36 35 30 2b 28 61 6c 70  68 61 2d 35 29 2a 32 2b  |650+(alpha-5)*2+|
00000850  9b 28 74 68 65 74 61 2a  af 2f 31 38 30 29 2a 35  |.(theta*./180)*5|
00000860  30 2c a4 79 28 74 68 65  74 61 2c 61 6c 70 68 61  |0,.y(theta,alpha|
00000870  2d 35 29 0d 04 ce 32 df  36 35 30 2b 61 6c 70 68  |-5)...2.650+alph|
00000880  61 2a 32 2b 9b 28 74 68  65 74 61 2a af 2f 31 38  |a*2+.(theta*./18|
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000008a0  6c 70 68 61 29 0d 04 d8  4d e7 20 28 61 6c 70 68  |lpha)...M. (alph|
000008b0  61 20 83 20 34 35 29 3d  30 20 8c 20 df 36 35 30  |a . 45)=0 . .650|
000008c0  2b 61 6c 70 68 61 2a 32  2b 9b 28 28 74 68 65 74  |+alpha*2+.((thet|
000008d0  61 2d 33 30 29 2a af 2f  31 38 30 29 2a 35 30 2c  |a-30)*./180)*50,|
000008e0  a4 79 28 74 68 65 74 61  2d 33 30 2c 61 6c 70 68  |.y(theta-30,alph|
000008f0  61 29 0d 04 e2 11 78 6f  3d 78 3a ed 3a 78 6f 3d  |a)....xo=x:.:xo=|
00000900  30 3a ed 0d 04 ec 05 3a  0d 04 f6 1e 20 f4 20 42  |0:.....:.... . B|
00000910  65 65 70 20 61 6e 64 20  77 61 69 74 20 66 6f 72  |eep and wait for|
00000920  20 73 70 61 63 65 0d 05  00 26 f1 8a 37 2c 33 30  | space...&..7,30|
00000930  29 22 50 72 65 73 73 20  3c 53 50 41 43 45 3e 20  |)"Press <SPACE> |
00000940  74 6f 20 63 6f 6e 74 69  6e 75 65 22 0d 05 0a 11  |to continue"....|
00000950  ef 37 3a f5 20 fd 20 a6  28 2d 39 39 29 0d 05 14  |.7:. . .(-99)...|
00000960  05 e1 0d 05 1e 05 3a 0d  05 28 2e dd a4 79 28 74  |......:..(...y(t|
00000970  68 2c 61 6c 29 3d 36 30  30 2b 32 35 30 2a b5 28  |h,al)=600+250*.(|
00000980  74 68 2a af 2f 31 38 30  29 2a b5 28 61 6c 2a af  |th*./180)*.(al*.|
00000990  2f 31 38 30 29 0d ff                              |/180)..|
00000997

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