Home » CEEFAX disks » telesoftware12.adl » 20-01-89/Offset
20-01-89/Offset
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 » CEEFAX disks » telesoftware12.adl |
| Filename: | 20-01-89/Offset |
| Read OK: | ✔ |
| File size: | 0D4E bytes |
| Load address: | 0800 |
| Exec address: | 802B |
File contents
10REM> OFFSET 20DIM mcode &100 30PROCmcode 40mode=0 50MODE mode 60PROCnewmode 70REPEAT 80IF INKEY(-58) PROCup:MODE mode:PROCnewmode 90IF INKEY(-42) PROCdown:MODE mode:PROCnewmode 100IF INKEY(-26) PROCleft 110IF INKEY(-122) PROCright 120CALL mcode 130IF (?xcoord<>oldx) OR (?ycoord<>oldy) VDU31,oldx,oldy,32,31,?xcoord,?ycoord,42 140oldx=?xcoord 150oldy=?ycoord 160UNTIL FALSE 170: 180DEFPROCleft 190IF offsetlow?mode=12 ENDPROC 200offsetlow?mode=offsetlow?mode+1 210PRINTTAB(15,2);offsetlow?mode;" "; 220PROCdelay 230ENDPROC 240: 250DEFPROCright 260IF offsetlow?mode=0 ENDPROC 270offsetlow?mode=offsetlow?mode-1 280PRINTTAB(15,2);offsetlow?mode;" "; 290PROCdelay 300ENDPROC 310: 320DEFPROCup 330mode=mode+1 340IF mode>7 mode=7 350ENDPROC 360: 370DEFPROCdown 380mode=mode-1 390IF mode<0 mode=0 400ENDPROC 410: 420DEFPROCnewmode 430VDU23,1,0;0;0;0; 440VDU19,0,6;0; 450VDU19,1,4;0; 460COLOUR1 470PRINTTAB(3,1)"Mode ";mode 480PRINTTAB(3,2)"offsetlow = ";offsetlow?mode 490IF mode=7 PROCseven 500CALL mcode 510oldx=?xcoord 520oldy=?ycoord 530PROCdelay 540ENDPROC 550: 560DEFPROCdelay 570time=TIME+20 580REPEAT UNTIL time<TIME 590ENDPROC 600: 610DEFPROCseven 620FOR line=0 TO 24 630VDU31,0,line,134,157,132 640NEXT 650ENDPROC 660: 670DEFPROCmcode 680xcoord=&70 690ycoord=&71 :REM: &71-&72 700osbyte=&FFF4 710FORpass=0TO2STEP2 720P%=mcode 730[OPT pass 740LDA #&87 \ read screen mode 750JSR osbyte 760TYA \ screen mode in Y register 770AND #&07 \ range 0-7 780STA screen \ store screen mode 790LDY #&10 \ light pen register, high byte 800JSR readio \ read light pen register 810CPY #&00 \ Y=0 if pen not used 820BEQ return 830STY ycoord+1 \ store high byte 840LDY #&11 \ light pen register, low byte 850JSR readio \ read light pen register 860TYA \ low byte into A 870LDY screen \ screen mode 880CLD \ clear decimal flag 890SEC \ prepare for subtraction 900SBC offsetlow,Y \ subtract screen mode offset 910STA ycoord \ low byte - offset 920LDA ycoord+1 \ high byte 930SBC offsethigh,Y \ subtract screen mode offset 940STA ycoord+1 \ high byte - offset 950LDA #&00 \ prepare for 16 bit division 960STA xcoord \ clear low partial dividend 970LDX #&10 \ set bit counter for 16 bit division 980.next 990ASL ycoord \ shift dividend/quotient left 1000ROL ycoord+1 \ shift dividend/quotient left 1010ROL xcoord \ shift bits into partial dividend 1020LDA xcoord \ load partial dividend 1030SEC \ prepare for subtraction 1040SBC width,Y \ subtract divisor 1050BCC done \ branch if dividend < divisor 1060INC ycoord \ increment quotient 1070STA xcoord \ save new partial dividend 1080.done 1090DEX \ decrement bit counter 1100BNE next \ branch for 16 bits 1110LDA scale,Y \ screen mode scale 1120BEQ return \ branch if modes 0, 3, 4, 6 or 7 1130TAX \ in mode1 and mode5 X=1, in mode2 X=2 1140LDA xcoord 1150.reduce 1160LSR A \ horizontal position / 2 1170DEX 1180BNE reduce 1190STA xcoord 1200.return 1210RTS \ return to BASIC 1220.readio 1230\ STY &FE00 1240\ LDY &FE01 1250\ RTS 1260LDA #&97 \ write to sheila 1270LDX #&00 \ offset 0 = &FE00 1280JSR osbyte 1290LDA #&96 \ read from sheila 1300LDX #&01 \ offset 1 = &FE01 1310JMP osbyte \ and return 1320.screen 1330EQUB &00 \ screen mode stored here 1340.offsetlow 1350EQUB &06 \ mode0, trimmed = 4 1360EQUB &06 \ mode1, trimmed = 4 1370EQUB &06 \ mode2, trimmed = 4 1380EQUB &06 \ mode3, trimmed = 4 1390EQUB &04 \ mode4, trimmed = 3 1400EQUB &04 \ mode5, trimmed = 3 1410EQUB &04 \ mode6, trimmed = 3 1420EQUB &08 \ mode7, trimmed = 6 1430.offsethigh 1440EQUD &08060606 \ modes 3-0 1450EQUD &280C0B0B \ modes 7-4 1460.scale 1470EQUD &00020100 \ modes 3-0 1480EQUD &00000100 \ modes 7-4 1490.width 1500EQUD &50505050 \ modes 3-0 1510EQUD &28282828 \ modes 7-4 1520] 1530NEXT 1540ENDPROC
�> OFFSET � mcode &100 �mcode ( mode=0 2 � mode < �newmode F� P � �(-58) �up:� mode:�newmode Z"� �(-42) �down:� mode:�newmode d� �(-26) �left n� �(-122) �right x � mcode �N� (?xcoord<>oldx) � (?ycoord<>oldy) �31,oldx,oldy,32,31,?xcoord,?ycoord,42 �oldx=?xcoord �oldy=?ycoord �� � �: � ��left �� offsetlow?mode=12 � �#offsetlow?mode=offsetlow?mode+1 � �15,2);offsetlow?mode;" "; � �delay �� �: � ��right � offsetlow?mode=0 � #offsetlow?mode=offsetlow?mode-1 �15,2);offsetlow?mode;" "; " �delay ,� 6: @��up Jmode=mode+1 T� mode>7 mode=7 ^� h: r ��down |mode=mode-1 �� mode<0 mode=0 �� �: � ��newmode ��23,1,0;0;0;0; ��19,0,6;0; ��19,1,4;0; ��1 ��3,1)"Mode ";mode �'�3,2)"offsetlow = ";offsetlow?mode �� mode=7 �seven � � mcode �oldx=?xcoord oldy=?ycoord �delay � &: 0 ��delay : time=�+20 D� � time<� N� X: b ��seven l� line=0 � 24 v�31,0,line,134,157,132 �� �� �: � ��mcode �xcoord=&70 �ycoord=&71 :�: &71-&72 �osbyte=&FFF4 ��pass=0�2�2 � P%=mcode � [OPT pass � LDA #&87 \ read screen mode �JSR osbyte �#TYA \ screen mode in Y register � #&07 \ range 0-7 "STA screen \ store screen mode ,LDY #&10 \ light pen register, high byte (JSR readio \ read light pen register *"CPY #&00 \ Y=0 if pen not used 4BEQ return >"STY ycoord+1 \ store high byte H+LDY #&11 \ light pen register, low byte R(JSR readio \ read light pen register \TYA \ low byte into A f LDY screen \ screen mode p CLD \ clear decimal flag z!SEC \ prepare for subtraction �1SBC offsetlow,Y \ subtract screen mode offset �"STA ycoord \ low byte - offset � LDA ycoord+1 \ high byte �2SBC offsethigh,Y \ subtract screen mode offset �%STA ycoord+1 \ high byte - offset �*LDA #&00 \ prepare for 16 bit division �+STA xcoord \ clear low partial dividend �2LDX #&10 \ set bit counter for 16 bit division � .next �-ASL ycoord \ shift dividend/quotient left �/ROL ycoord+1 \ shift dividend/quotient left �1ROL xcoord \ shift bits into partial dividend �&LDA xcoord \ load partial dividend !SEC \ prepare for subtraction "SBC width,Y \ subtract divisor +BCC done \ branch if dividend < divisor $#INC ycoord \ increment quotient .*STA xcoord \ save new partial dividend 8 .done B DEX \ decrement bit counter L!BNE next \ branch for 16 bits V#LDA scale,Y \ screen mode scale `0BEQ return \ branch if modes 0, 3, 4, 6 or 7 j.TAX \ in mode1 and mode5 X=1, in mode2 X=2 tLDA xcoord ~ .reduce �#LSR A \ horizontal position / 2 �DEX �BNE reduce �STA xcoord � .return �RTS \ return to BASIC � .readio �\ STY &FE00 �\ LDY &FE01 � \ RTS � LDA #&97 \ write to sheila � LDX #&00 \ offset 0 = &FE00 JSR osbyte LDA #&96 \ read from sheila LDX #&01 \ offset 1 = &FE01 JMP osbyte \ and return ( .screen 2&EQUB &00 \ screen mode stored here <.offsetlow F!EQUB &06 \ mode0, trimmed = 4 P!EQUB &06 \ mode1, trimmed = 4 Z!EQUB &06 \ mode2, trimmed = 4 d!EQUB &06 \ mode3, trimmed = 4 n!EQUB &04 \ mode4, trimmed = 3 x!EQUB &04 \ mode5, trimmed = 3 �!EQUB &04 \ mode6, trimmed = 3 �!EQUB &08 \ mode7, trimmed = 6 �.offsethigh � EQUD &08060606 \ modes 3-0 � EQUD &280C0B0B \ modes 7-4 � .scale � EQUD &00020100 \ modes 3-0 � EQUD &00000100 \ modes 7-4 � .width � EQUD &50505050 \ modes 3-0 � EQUD &28282828 \ modes 7-4 �] �� � �
00000000 0d 00 0a 0d f4 3e 20 4f 46 46 53 45 54 0d 00 14 |.....> OFFSET...| 00000010 10 de 20 6d 63 6f 64 65 20 26 31 30 30 0d 00 1e |.. mcode &100...| 00000020 0a f2 6d 63 6f 64 65 0d 00 28 0a 6d 6f 64 65 3d |..mcode..(.mode=| 00000030 30 0d 00 32 0a eb 20 6d 6f 64 65 0d 00 3c 0c f2 |0..2.. mode..<..| 00000040 6e 65 77 6d 6f 64 65 0d 00 46 05 f5 0d 00 50 20 |newmode..F....P | 00000050 e7 20 a6 28 2d 35 38 29 20 f2 75 70 3a eb 20 6d |. .(-58) .up:. m| 00000060 6f 64 65 3a f2 6e 65 77 6d 6f 64 65 0d 00 5a 22 |ode:.newmode..Z"| 00000070 e7 20 a6 28 2d 34 32 29 20 f2 64 6f 77 6e 3a eb |. .(-42) .down:.| 00000080 20 6d 6f 64 65 3a f2 6e 65 77 6d 6f 64 65 0d 00 | mode:.newmode..| 00000090 64 12 e7 20 a6 28 2d 32 36 29 20 f2 6c 65 66 74 |d.. .(-26) .left| 000000a0 0d 00 6e 14 e7 20 a6 28 2d 31 32 32 29 20 f2 72 |..n.. .(-122) .r| 000000b0 69 67 68 74 0d 00 78 0b d6 20 6d 63 6f 64 65 0d |ight..x.. mcode.| 000000c0 00 82 4e e7 20 28 3f 78 63 6f 6f 72 64 3c 3e 6f |..N. (?xcoord<>o| 000000d0 6c 64 78 29 20 84 20 28 3f 79 63 6f 6f 72 64 3c |ldx) . (?ycoord<| 000000e0 3e 6f 6c 64 79 29 20 ef 33 31 2c 6f 6c 64 78 2c |>oldy) .31,oldx,| 000000f0 6f 6c 64 79 2c 33 32 2c 33 31 2c 3f 78 63 6f 6f |oldy,32,31,?xcoo| 00000100 72 64 2c 3f 79 63 6f 6f 72 64 2c 34 32 0d 00 8c |rd,?ycoord,42...| 00000110 10 6f 6c 64 78 3d 3f 78 63 6f 6f 72 64 0d 00 96 |.oldx=?xcoord...| 00000120 10 6f 6c 64 79 3d 3f 79 63 6f 6f 72 64 0d 00 a0 |.oldy=?ycoord...| 00000130 07 fd 20 a3 0d 00 aa 05 3a 0d 00 b4 0a dd f2 6c |.. .....:......l| 00000140 65 66 74 0d 00 be 19 e7 20 6f 66 66 73 65 74 6c |eft..... offsetl| 00000150 6f 77 3f 6d 6f 64 65 3d 31 32 20 e1 0d 00 c8 23 |ow?mode=12 ....#| 00000160 6f 66 66 73 65 74 6c 6f 77 3f 6d 6f 64 65 3d 6f |offsetlow?mode=o| 00000170 66 66 73 65 74 6c 6f 77 3f 6d 6f 64 65 2b 31 0d |ffsetlow?mode+1.| 00000180 00 d2 1f f1 8a 31 35 2c 32 29 3b 6f 66 66 73 65 |.....15,2);offse| 00000190 74 6c 6f 77 3f 6d 6f 64 65 3b 22 20 22 3b 0d 00 |tlow?mode;" ";..| 000001a0 dc 0a f2 64 65 6c 61 79 0d 00 e6 05 e1 0d 00 f0 |...delay........| 000001b0 05 3a 0d 00 fa 0b dd f2 72 69 67 68 74 0d 01 04 |.:......right...| 000001c0 18 e7 20 6f 66 66 73 65 74 6c 6f 77 3f 6d 6f 64 |.. offsetlow?mod| 000001d0 65 3d 30 20 e1 0d 01 0e 23 6f 66 66 73 65 74 6c |e=0 ....#offsetl| 000001e0 6f 77 3f 6d 6f 64 65 3d 6f 66 66 73 65 74 6c 6f |ow?mode=offsetlo| 000001f0 77 3f 6d 6f 64 65 2d 31 0d 01 18 1f f1 8a 31 35 |w?mode-1......15| 00000200 2c 32 29 3b 6f 66 66 73 65 74 6c 6f 77 3f 6d 6f |,2);offsetlow?mo| 00000210 64 65 3b 22 20 22 3b 0d 01 22 0a f2 64 65 6c 61 |de;" ";.."..dela| 00000220 79 0d 01 2c 05 e1 0d 01 36 05 3a 0d 01 40 08 dd |y..,....6.:..@..| 00000230 f2 75 70 0d 01 4a 0f 6d 6f 64 65 3d 6d 6f 64 65 |.up..J.mode=mode| 00000240 2b 31 0d 01 54 13 e7 20 6d 6f 64 65 3e 37 20 6d |+1..T.. mode>7 m| 00000250 6f 64 65 3d 37 0d 01 5e 05 e1 0d 01 68 05 3a 0d |ode=7..^....h.:.| 00000260 01 72 0a dd f2 64 6f 77 6e 0d 01 7c 0f 6d 6f 64 |.r...down..|.mod| 00000270 65 3d 6d 6f 64 65 2d 31 0d 01 86 13 e7 20 6d 6f |e=mode-1..... mo| 00000280 64 65 3c 30 20 6d 6f 64 65 3d 30 0d 01 90 05 e1 |de<0 mode=0.....| 00000290 0d 01 9a 05 3a 0d 01 a4 0d dd f2 6e 65 77 6d 6f |....:......newmo| 000002a0 64 65 0d 01 ae 12 ef 32 33 2c 31 2c 30 3b 30 3b |de.....23,1,0;0;| 000002b0 30 3b 30 3b 0d 01 b8 0e ef 31 39 2c 30 2c 36 3b |0;0;.....19,0,6;| 000002c0 30 3b 0d 01 c2 0e ef 31 39 2c 31 2c 34 3b 30 3b |0;.....19,1,4;0;| 000002d0 0d 01 cc 06 fb 31 0d 01 d6 16 f1 8a 33 2c 31 29 |.....1......3,1)| 000002e0 22 4d 6f 64 65 20 22 3b 6d 6f 64 65 0d 01 e0 27 |"Mode ";mode...'| 000002f0 f1 8a 33 2c 32 29 22 6f 66 66 73 65 74 6c 6f 77 |..3,2)"offsetlow| 00000300 20 3d 20 22 3b 6f 66 66 73 65 74 6c 6f 77 3f 6d | = ";offsetlow?m| 00000310 6f 64 65 0d 01 ea 13 e7 20 6d 6f 64 65 3d 37 20 |ode..... mode=7 | 00000320 f2 73 65 76 65 6e 0d 01 f4 0b d6 20 6d 63 6f 64 |.seven..... mcod| 00000330 65 0d 01 fe 10 6f 6c 64 78 3d 3f 78 63 6f 6f 72 |e....oldx=?xcoor| 00000340 64 0d 02 08 10 6f 6c 64 79 3d 3f 79 63 6f 6f 72 |d....oldy=?ycoor| 00000350 64 0d 02 12 0a f2 64 65 6c 61 79 0d 02 1c 05 e1 |d.....delay.....| 00000360 0d 02 26 05 3a 0d 02 30 0b dd f2 64 65 6c 61 79 |..&.:..0...delay| 00000370 0d 02 3a 0d 74 69 6d 65 3d 91 2b 32 30 0d 02 44 |..:.time=.+20..D| 00000380 0e f5 20 fd 20 74 69 6d 65 3c 91 0d 02 4e 05 e1 |.. . time<...N..| 00000390 0d 02 58 05 3a 0d 02 62 0b dd f2 73 65 76 65 6e |..X.:..b...seven| 000003a0 0d 02 6c 11 e3 20 6c 69 6e 65 3d 30 20 b8 20 32 |..l.. line=0 . 2| 000003b0 34 0d 02 76 1a ef 33 31 2c 30 2c 6c 69 6e 65 2c |4..v..31,0,line,| 000003c0 31 33 34 2c 31 35 37 2c 31 33 32 0d 02 80 05 ed |134,157,132.....| 000003d0 0d 02 8a 05 e1 0d 02 94 05 3a 0d 02 9e 0b dd f2 |.........:......| 000003e0 6d 63 6f 64 65 0d 02 a8 0e 78 63 6f 6f 72 64 3d |mcode....xcoord=| 000003f0 26 37 30 0d 02 b2 1a 79 63 6f 6f 72 64 3d 26 37 |&70....ycoord=&7| 00000400 31 20 3a f4 3a 20 26 37 31 2d 26 37 32 0d 02 bc |1 :.: &71-&72...| 00000410 10 6f 73 62 79 74 65 3d 26 46 46 46 34 0d 02 c6 |.osbyte=&FFF4...| 00000420 0f e3 70 61 73 73 3d 30 b8 32 88 32 0d 02 d0 0c |..pass=0.2.2....| 00000430 50 25 3d 6d 63 6f 64 65 0d 02 da 0d 5b 4f 50 54 |P%=mcode....[OPT| 00000440 20 70 61 73 73 0d 02 e4 1f 4c 44 41 20 23 26 38 | pass....LDA #&8| 00000450 37 20 5c 20 72 65 61 64 20 73 63 72 65 65 6e 20 |7 \ read screen | 00000460 6d 6f 64 65 0d 02 ee 0e 4a 53 52 20 6f 73 62 79 |mode....JSR osby| 00000470 74 65 0d 02 f8 23 54 59 41 20 5c 20 73 63 72 65 |te...#TYA \ scre| 00000480 65 6e 20 6d 6f 64 65 20 69 6e 20 59 20 72 65 67 |en mode in Y reg| 00000490 69 73 74 65 72 0d 03 02 16 80 20 23 26 30 37 20 |ister..... #&07 | 000004a0 5c 20 72 61 6e 67 65 20 30 2d 37 0d 03 0c 22 53 |\ range 0-7..."S| 000004b0 54 41 20 73 63 72 65 65 6e 20 5c 20 73 74 6f 72 |TA screen \ stor| 000004c0 65 20 73 63 72 65 65 6e 20 6d 6f 64 65 0d 03 16 |e screen mode...| 000004d0 2c 4c 44 59 20 23 26 31 30 20 5c 20 6c 69 67 68 |,LDY #&10 \ ligh| 000004e0 74 20 70 65 6e 20 72 65 67 69 73 74 65 72 2c 20 |t pen register, | 000004f0 68 69 67 68 20 62 79 74 65 0d 03 20 28 4a 53 52 |high byte.. (JSR| 00000500 20 72 65 61 64 69 6f 20 5c 20 72 65 61 64 20 6c | readio \ read l| 00000510 69 67 68 74 20 70 65 6e 20 72 65 67 69 73 74 65 |ight pen registe| 00000520 72 0d 03 2a 22 43 50 59 20 23 26 30 30 20 5c 20 |r..*"CPY #&00 \ | 00000530 59 3d 30 20 69 66 20 70 65 6e 20 6e 6f 74 20 75 |Y=0 if pen not u| 00000540 73 65 64 0d 03 34 0e 42 45 51 20 72 65 74 75 72 |sed..4.BEQ retur| 00000550 6e 0d 03 3e 22 53 54 59 20 79 63 6f 6f 72 64 2b |n..>"STY ycoord+| 00000560 31 20 5c 20 73 74 6f 72 65 20 68 69 67 68 20 62 |1 \ store high b| 00000570 79 74 65 0d 03 48 2b 4c 44 59 20 23 26 31 31 20 |yte..H+LDY #&11 | 00000580 5c 20 6c 69 67 68 74 20 70 65 6e 20 72 65 67 69 |\ light pen regi| 00000590 73 74 65 72 2c 20 6c 6f 77 20 62 79 74 65 0d 03 |ster, low byte..| 000005a0 52 28 4a 53 52 20 72 65 61 64 69 6f 20 5c 20 72 |R(JSR readio \ r| 000005b0 65 61 64 20 6c 69 67 68 74 20 70 65 6e 20 72 65 |ead light pen re| 000005c0 67 69 73 74 65 72 0d 03 5c 19 54 59 41 20 5c 20 |gister..\.TYA \ | 000005d0 6c 6f 77 20 62 79 74 65 20 69 6e 74 6f 20 41 0d |low byte into A.| 000005e0 03 66 1c 4c 44 59 20 73 63 72 65 65 6e 20 5c 20 |.f.LDY screen \ | 000005f0 73 63 72 65 65 6e 20 6d 6f 64 65 0d 03 70 1c 43 |screen mode..p.C| 00000600 4c 44 20 5c 20 63 6c 65 61 72 20 64 65 63 69 6d |LD \ clear decim| 00000610 61 6c 20 66 6c 61 67 0d 03 7a 21 53 45 43 20 5c |al flag..z!SEC \| 00000620 20 70 72 65 70 61 72 65 20 66 6f 72 20 73 75 62 | prepare for sub| 00000630 74 72 61 63 74 69 6f 6e 0d 03 84 31 53 42 43 20 |traction...1SBC | 00000640 6f 66 66 73 65 74 6c 6f 77 2c 59 20 5c 20 73 75 |offsetlow,Y \ su| 00000650 62 74 72 61 63 74 20 73 63 72 65 65 6e 20 6d 6f |btract screen mo| 00000660 64 65 20 6f 66 66 73 65 74 0d 03 8e 22 53 54 41 |de offset..."STA| 00000670 20 79 63 6f 6f 72 64 20 5c 20 6c 6f 77 20 62 79 | ycoord \ low by| 00000680 74 65 20 2d 20 6f 66 66 73 65 74 0d 03 98 1c 4c |te - offset....L| 00000690 44 41 20 79 63 6f 6f 72 64 2b 31 20 5c 20 68 69 |DA ycoord+1 \ hi| 000006a0 67 68 20 62 79 74 65 0d 03 a2 32 53 42 43 20 6f |gh byte...2SBC o| 000006b0 66 66 73 65 74 68 69 67 68 2c 59 20 5c 20 73 75 |ffsethigh,Y \ su| 000006c0 62 74 72 61 63 74 20 73 63 72 65 65 6e 20 6d 6f |btract screen mo| 000006d0 64 65 20 6f 66 66 73 65 74 0d 03 ac 25 53 54 41 |de offset...%STA| 000006e0 20 79 63 6f 6f 72 64 2b 31 20 5c 20 68 69 67 68 | ycoord+1 \ high| 000006f0 20 62 79 74 65 20 2d 20 6f 66 66 73 65 74 0d 03 | byte - offset..| 00000700 b6 2a 4c 44 41 20 23 26 30 30 20 5c 20 70 72 65 |.*LDA #&00 \ pre| 00000710 70 61 72 65 20 66 6f 72 20 31 36 20 62 69 74 20 |pare for 16 bit | 00000720 64 69 76 69 73 69 6f 6e 0d 03 c0 2b 53 54 41 20 |division...+STA | 00000730 78 63 6f 6f 72 64 20 5c 20 63 6c 65 61 72 20 6c |xcoord \ clear l| 00000740 6f 77 20 70 61 72 74 69 61 6c 20 64 69 76 69 64 |ow partial divid| 00000750 65 6e 64 0d 03 ca 32 4c 44 58 20 23 26 31 30 20 |end...2LDX #&10 | 00000760 5c 20 73 65 74 20 62 69 74 20 63 6f 75 6e 74 65 |\ set bit counte| 00000770 72 20 66 6f 72 20 31 36 20 62 69 74 20 64 69 76 |r for 16 bit div| 00000780 69 73 69 6f 6e 0d 03 d4 09 2e 6e 65 78 74 0d 03 |ision.....next..| 00000790 de 2d 41 53 4c 20 79 63 6f 6f 72 64 20 5c 20 73 |.-ASL ycoord \ s| 000007a0 68 69 66 74 20 64 69 76 69 64 65 6e 64 2f 71 75 |hift dividend/qu| 000007b0 6f 74 69 65 6e 74 20 6c 65 66 74 0d 03 e8 2f 52 |otient left.../R| 000007c0 4f 4c 20 79 63 6f 6f 72 64 2b 31 20 5c 20 73 68 |OL ycoord+1 \ sh| 000007d0 69 66 74 20 64 69 76 69 64 65 6e 64 2f 71 75 6f |ift dividend/quo| 000007e0 74 69 65 6e 74 20 6c 65 66 74 0d 03 f2 31 52 4f |tient left...1RO| 000007f0 4c 20 78 63 6f 6f 72 64 20 5c 20 73 68 69 66 74 |L xcoord \ shift| 00000800 20 62 69 74 73 20 69 6e 74 6f 20 70 61 72 74 69 | bits into parti| 00000810 61 6c 20 64 69 76 69 64 65 6e 64 0d 03 fc 26 4c |al dividend...&L| 00000820 44 41 20 78 63 6f 6f 72 64 20 5c 20 6c 6f 61 64 |DA xcoord \ load| 00000830 20 70 61 72 74 69 61 6c 20 64 69 76 69 64 65 6e | partial dividen| 00000840 64 0d 04 06 21 53 45 43 20 5c 20 70 72 65 70 61 |d...!SEC \ prepa| 00000850 72 65 20 66 6f 72 20 73 75 62 74 72 61 63 74 69 |re for subtracti| 00000860 6f 6e 0d 04 10 22 53 42 43 20 77 69 64 74 68 2c |on..."SBC width,| 00000870 59 20 5c 20 73 75 62 74 72 61 63 74 20 64 69 76 |Y \ subtract div| 00000880 69 73 6f 72 0d 04 1a 2b 42 43 43 20 64 6f 6e 65 |isor...+BCC done| 00000890 20 5c 20 62 72 61 6e 63 68 20 69 66 20 64 69 76 | \ branch if div| 000008a0 69 64 65 6e 64 20 3c 20 64 69 76 69 73 6f 72 0d |idend < divisor.| 000008b0 04 24 23 49 4e 43 20 79 63 6f 6f 72 64 20 5c 20 |.$#INC ycoord \ | 000008c0 69 6e 63 72 65 6d 65 6e 74 20 71 75 6f 74 69 65 |increment quotie| 000008d0 6e 74 0d 04 2e 2a 53 54 41 20 78 63 6f 6f 72 64 |nt...*STA xcoord| 000008e0 20 5c 20 73 61 76 65 20 6e 65 77 20 70 61 72 74 | \ save new part| 000008f0 69 61 6c 20 64 69 76 69 64 65 6e 64 0d 04 38 09 |ial dividend..8.| 00000900 2e 64 6f 6e 65 0d 04 42 1f 44 45 58 20 5c 20 64 |.done..B.DEX \ d| 00000910 65 63 72 65 6d 65 6e 74 20 62 69 74 20 63 6f 75 |ecrement bit cou| 00000920 6e 74 65 72 0d 04 4c 21 42 4e 45 20 6e 65 78 74 |nter..L!BNE next| 00000930 20 5c 20 62 72 61 6e 63 68 20 66 6f 72 20 31 36 | \ branch for 16| 00000940 20 62 69 74 73 0d 04 56 23 4c 44 41 20 73 63 61 | bits..V#LDA sca| 00000950 6c 65 2c 59 20 5c 20 73 63 72 65 65 6e 20 6d 6f |le,Y \ screen mo| 00000960 64 65 20 73 63 61 6c 65 0d 04 60 30 42 45 51 20 |de scale..`0BEQ | 00000970 72 65 74 75 72 6e 20 5c 20 62 72 61 6e 63 68 20 |return \ branch | 00000980 69 66 20 6d 6f 64 65 73 20 30 2c 20 33 2c 20 34 |if modes 0, 3, 4| 00000990 2c 20 36 20 6f 72 20 37 0d 04 6a 2e 54 41 58 20 |, 6 or 7..j.TAX | 000009a0 5c 20 69 6e 20 6d 6f 64 65 31 20 61 6e 64 20 6d |\ in mode1 and m| 000009b0 6f 64 65 35 20 58 3d 31 2c 20 69 6e 20 6d 6f 64 |ode5 X=1, in mod| 000009c0 65 32 20 58 3d 32 0d 04 74 0e 4c 44 41 20 78 63 |e2 X=2..t.LDA xc| 000009d0 6f 6f 72 64 0d 04 7e 0b 2e 72 65 64 75 63 65 0d |oord..~..reduce.| 000009e0 04 88 23 4c 53 52 20 41 20 5c 20 68 6f 72 69 7a |..#LSR A \ horiz| 000009f0 6f 6e 74 61 6c 20 70 6f 73 69 74 69 6f 6e 20 2f |ontal position /| 00000a00 20 32 0d 04 92 07 44 45 58 0d 04 9c 0e 42 4e 45 | 2....DEX....BNE| 00000a10 20 72 65 64 75 63 65 0d 04 a6 0e 53 54 41 20 78 | reduce....STA x| 00000a20 63 6f 6f 72 64 0d 04 b0 0b 2e 72 65 74 75 72 6e |coord.....return| 00000a30 0d 04 ba 19 52 54 53 20 5c 20 72 65 74 75 72 6e |....RTS \ return| 00000a40 20 74 6f 20 42 41 53 49 43 0d 04 c4 0b 2e 72 65 | to BASIC.....re| 00000a50 61 64 69 6f 0d 04 ce 0f 5c 20 53 54 59 20 26 46 |adio....\ STY &F| 00000a60 45 30 30 0d 04 d8 0f 5c 20 4c 44 59 20 26 46 45 |E00....\ LDY &FE| 00000a70 30 31 0d 04 e2 09 5c 20 52 54 53 0d 04 ec 1e 4c |01....\ RTS....L| 00000a80 44 41 20 23 26 39 37 20 5c 20 77 72 69 74 65 20 |DA #&97 \ write | 00000a90 74 6f 20 73 68 65 69 6c 61 0d 04 f6 1f 4c 44 58 |to sheila....LDX| 00000aa0 20 23 26 30 30 20 5c 20 6f 66 66 73 65 74 20 30 | #&00 \ offset 0| 00000ab0 20 3d 20 26 46 45 30 30 0d 05 00 0e 4a 53 52 20 | = &FE00....JSR | 00000ac0 6f 73 62 79 74 65 0d 05 0a 1f 4c 44 41 20 23 26 |osbyte....LDA #&| 00000ad0 39 36 20 5c 20 72 65 61 64 20 66 72 6f 6d 20 73 |96 \ read from s| 00000ae0 68 65 69 6c 61 0d 05 14 1f 4c 44 58 20 23 26 30 |heila....LDX #&0| 00000af0 31 20 5c 20 6f 66 66 73 65 74 20 31 20 3d 20 26 |1 \ offset 1 = &| 00000b00 46 45 30 31 0d 05 1e 1b 4a 4d 50 20 6f 73 62 79 |FE01....JMP osby| 00000b10 74 65 20 5c 20 61 6e 64 20 72 65 74 75 72 6e 0d |te \ and return.| 00000b20 05 28 0b 2e 73 63 72 65 65 6e 0d 05 32 26 45 51 |.(..screen..2&EQ| 00000b30 55 42 20 26 30 30 20 5c 20 73 63 72 65 65 6e 20 |UB &00 \ screen | 00000b40 6d 6f 64 65 20 73 74 6f 72 65 64 20 68 65 72 65 |mode stored here| 00000b50 0d 05 3c 0e 2e 6f 66 66 73 65 74 6c 6f 77 0d 05 |..<..offsetlow..| 00000b60 46 21 45 51 55 42 20 26 30 36 20 5c 20 6d 6f 64 |F!EQUB &06 \ mod| 00000b70 65 30 2c 20 74 72 69 6d 6d 65 64 20 3d 20 34 0d |e0, trimmed = 4.| 00000b80 05 50 21 45 51 55 42 20 26 30 36 20 5c 20 6d 6f |.P!EQUB &06 \ mo| 00000b90 64 65 31 2c 20 74 72 69 6d 6d 65 64 20 3d 20 34 |de1, trimmed = 4| 00000ba0 0d 05 5a 21 45 51 55 42 20 26 30 36 20 5c 20 6d |..Z!EQUB &06 \ m| 00000bb0 6f 64 65 32 2c 20 74 72 69 6d 6d 65 64 20 3d 20 |ode2, trimmed = | 00000bc0 34 0d 05 64 21 45 51 55 42 20 26 30 36 20 5c 20 |4..d!EQUB &06 \ | 00000bd0 6d 6f 64 65 33 2c 20 74 72 69 6d 6d 65 64 20 3d |mode3, trimmed =| 00000be0 20 34 0d 05 6e 21 45 51 55 42 20 26 30 34 20 5c | 4..n!EQUB &04 \| 00000bf0 20 6d 6f 64 65 34 2c 20 74 72 69 6d 6d 65 64 20 | mode4, trimmed | 00000c00 3d 20 33 0d 05 78 21 45 51 55 42 20 26 30 34 20 |= 3..x!EQUB &04 | 00000c10 5c 20 6d 6f 64 65 35 2c 20 74 72 69 6d 6d 65 64 |\ mode5, trimmed| 00000c20 20 3d 20 33 0d 05 82 21 45 51 55 42 20 26 30 34 | = 3...!EQUB &04| 00000c30 20 5c 20 6d 6f 64 65 36 2c 20 74 72 69 6d 6d 65 | \ mode6, trimme| 00000c40 64 20 3d 20 33 0d 05 8c 21 45 51 55 42 20 26 30 |d = 3...!EQUB &0| 00000c50 38 20 5c 20 6d 6f 64 65 37 2c 20 74 72 69 6d 6d |8 \ mode7, trimm| 00000c60 65 64 20 3d 20 36 0d 05 96 0f 2e 6f 66 66 73 65 |ed = 6.....offse| 00000c70 74 68 69 67 68 0d 05 a0 1e 45 51 55 44 20 26 30 |thigh....EQUD &0| 00000c80 38 30 36 30 36 30 36 20 5c 20 6d 6f 64 65 73 20 |8060606 \ modes | 00000c90 33 2d 30 0d 05 aa 1e 45 51 55 44 20 26 32 38 30 |3-0....EQUD &280| 00000ca0 43 30 42 30 42 20 5c 20 6d 6f 64 65 73 20 37 2d |C0B0B \ modes 7-| 00000cb0 34 0d 05 b4 0a 2e 73 63 61 6c 65 0d 05 be 1e 45 |4.....scale....E| 00000cc0 51 55 44 20 26 30 30 30 32 30 31 30 30 20 5c 20 |QUD &00020100 \ | 00000cd0 6d 6f 64 65 73 20 33 2d 30 0d 05 c8 1e 45 51 55 |modes 3-0....EQU| 00000ce0 44 20 26 30 30 30 30 30 31 30 30 20 5c 20 6d 6f |D &00000100 \ mo| 00000cf0 64 65 73 20 37 2d 34 0d 05 d2 0a 2e 77 69 64 74 |des 7-4.....widt| 00000d00 68 0d 05 dc 1e 45 51 55 44 20 26 35 30 35 30 35 |h....EQUD &50505| 00000d10 30 35 30 20 5c 20 6d 6f 64 65 73 20 33 2d 30 0d |050 \ modes 3-0.| 00000d20 05 e6 1e 45 51 55 44 20 26 32 38 32 38 32 38 32 |...EQUD &2828282| 00000d30 38 20 5c 20 6d 6f 64 65 73 20 37 2d 34 0d 05 f0 |8 \ modes 7-4...| 00000d40 05 5d 0d 05 fa 05 ed 0d 06 04 05 e1 0d ff |.]............| 00000d4e
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