Home » Personal collection » Acorn tapes » Electron_User » Electron_User_tape05a_acorn_eu_1989_november.wav » SCROLL
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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 tapes » Electron_User » Electron_User_tape05a_acorn_eu_1989_november.wav |
Filename: | SCROLL |
Read OK: | ✔ |
File size: | 0D7E bytes |
Load address: | 2000 |
Exec address: | 1900 |
Duplicates
There are 2 duplicate copies of this file in the archive:
- AEW website » database » database_5_25_discs_Electron-User-7-02_D-E702.ssd » SCROLL
- AEW website » database » database_tapes_Electron-User-7-02_EU7-2_E.uef » SCROLL
- Personal collection » Acorn tapes » Electron_User » Electron_User_tape05a_acorn_eu_1989_november.wav » SCROLL
File contents
10 REM Bigscroll 20 REM By R.Henderson 30 REM (c) Electron User 40 MODE 4:*FX16 50 VDU 23,1,0;0;0;0; 60 *FX178 70 PROCread(5) 80 HIMEM=&3000 90 REM Main machine code 100 FOR i%=0 TO 2 STEP 2 110 P%=&900 120 [ OPT i% 130 \ Save registers 140 .jp STA &79:STX &7A 150 STY &7B:CLD 160 .text 170 LDA &71:CMP &77:BEQ lx 180 INC &70:BNE prg 190 INC &71 200 \ Get letter and 210 \ store bit pattern 220 .prg 230 LDY #0:LDA (&70),Y 240 CMP #1:BEQ invon 250 CMP #2:BEQ invoff 260 STA &80:JSR times 270 \ Call scrolling 280 \ subroutines 290 .scsl1 300 JSR scrolling:JSR loop 310 JSR scr:JSR xyz 320 JSR drw:JSR xyz:JSR tblh 330 \ Restore registers 340 \ and quit 350 LDY &7B:LDX &7A 360 LDA &79:RTS 370 \ Scroll the message 380 .xyz 390 LDY #0 400 .loop 410 LDA (&72),Y:STA (&74),Y 420 INY:BNE loop 430 INC &75:INC &73 440 .loop2 450 LDA (&72),Y:STA (&74),Y:INY 460 CPY #&40:BNE loop2 470 RTS 480 \ Checks for end 490 \ of message 500 .lx LDA &70:CMP &76 510 BEQ xl:RTS 520 \ Checks for inverse 530 .invon LDA #&FF:STA &78 540 INC &70:JMP prg 550 .invoff LDA #&0:STA &78 560 INC &70:JMP prg 570 RTS 580 .xl LDA #lo%:STA &70:LDA #hi% 590 STA &71:INC &70:JMP prg 600 .rts RTS 610 \ Print triple 620 \ height letter 630 .tblh 640 LDA &88:EOR &78:STA &7FFF:STA &7FFE:STA &7FFD:LDA &87:EOR &78:STA &7FFC 650 STA &7FFB:STA &7FFA:LDA &86:EOR &78:STA &7FF9:STA &7FF8 660 STA &7EBF:LDA &85:EOR &78:STA &7EBE:STA &7EBD:STA &7EBC:LDA &84:EOR &78 670 STA &7EBB:STA &7EBA:STA &7EB9:LDA &83:EOR &78:STA &7EB8 680 STA &7D7F:STA &7D7E:LDA &82:EOR &78:STA &7D7D:STA &7D7C:STA &7D7B 690 LDA &81:EOR &78:STA &7D7A:STA &7D79:STA &7D78:RTS 700 .scrolling 710 LDA #&7D:STA &75:STA &73 720 LDA #&78:STA &74 730 LDA #&80:STA &72:RTS 740 .drw 750 LDA #&7E:STA &75:STA &73 760 LDA #&C0:STA &74 770 LDA #&C8:STA &72:RTS 780 .scr 790 LDA #&7C:STA &75:STA &73 800 LDA #&40:STA &74:LDA #&48 810 STA &72:RTS 820 .times LDA #0:STA &8C 830 LDA &80:SEC:SBC #32 840 \ Multiply by 8 850 STA &8B:CLC:ASL &8B:ROL &8C 860 ASL &8B:ROL &8C:ASL &8B:ROL &8C 870 .scan 880 \ Get char def 890 \ from ROM 900 LDA #0:STA &8E:LDA #&C0:STA &8F 910 CLC:LDA &8B:ADC &8E:STA &8E 920 LDA &8C:ADC &8F:STA &8F 930 .do LDY #0:LDX #0 940 .dlp LDA (&8E),Y:STA &81,X 950 INY:INX:CPX #8:BNE dlp:RTS 960 :]:NEXT 970 ?&220=0:?&221=&9:*FX14,4 980 PRINTTAB(12,14);"SCROLLING TEXT" 990 PRINTTAB(17,16);"DEMO" 1000 *FX15,1 1010 GCOL 12,1:SOUND 1,1,100,-1:flg%=0 1020 REPEAT:FOR li%=464 TO 596 STEP 8 1030 MOVE 0,li%:DRAW 1278,li% 1040 ENVELOPE 1,1,-1,1,?&240,1,1,4,0,0,0,0,0,0 1050 IF INKEY(0)=32 li%=1024:flg%=1 1060 NEXT:UNTIL flg%=1 1070 VDU 7:*FX13,4 1080 CLS:VDU 23,1,1,0;0;0;0;:END 1090 DEF PROCread(pointer%) 1100 start%=&3000:end%=&3200 1110 lo%=start% MOD 256 1120 hi%=start% DIV 256 1130 fi%=end% MOD 256 1140 sh%=end% DIV 256 1150 ?&70=lo%:?&71=hi% 1160 ?&76=fi%:?&77=sh% 1170 FOR f%=start% TO end%:?f%=32:NEXT 1180 v%=start% 1190 FOR r%=0 TO pointer%:READ f$ 1200 FOR mem%=1 TO LEN(f$) 1210 dat%=v%+mem% 1220 ?dat%=ASC(MID$(f$,mem%,1)) 1230 NEXT 1240 v%=v%+(mem%-1) 1250 NEXT 1260 REM Poke inverse data 1270 ?&3182=1:?&3194=2 1280 ?&78=0 1290 ENDPROC 1300 DATA " As you can see, this is a demonstration of smooth (and fast!) horizontal scrolling... " 1310 DATA "The code works in mode 4 only and (at least in theory) is able to scroll a message of up to 65536 bytes (64k), which is more space than you are ever likely to need... " 1320 DATA " You could have scrolling messages in high score tables, demos and 1001 other uses..." 1330 DATA " It can also display your message in " 1340 DATA " inverse video... How about that then ? ... " 1350 DATA " Type *FX13,4 to stop the scrolling... Thats all folks..."
� Bigscroll � By R.Henderson � (c) Electron User ( � 4:*FX16 2 � 23,1,0;0;0;0; < *FX178 F �read(5) P �=&3000 Z � Main machine code d � i%=0 � 2 � 2 n P%=&900 x [ OPT i% � \ Save registers � .jp STA &79:STX &7A � STY &7B:CLD � .text � LDA &71:CMP &77:BEQ lx � INC &70:BNE prg � INC &71 � \ Get letter and � \ store bit pattern � .prg � LDY #0:LDA (&70),Y � CMP #1:BEQ invon � CMP #2:BEQ invoff STA &80:JSR times \ Call scrolling \ subroutines " .scsl1 , JSR scrolling:JSR loop 6 JSR scr:JSR xyz @ JSR drw:JSR xyz:JSR tblh J \ Restore registers T \ and quit ^ LDY &7B:LDX &7A h LDA &79:RTS r \ Scroll the message | .xyz � LDY #0 � .loop � LDA (&72),Y:STA (&74),Y � INY:BNE loop � INC &75:INC &73 � .loop2 � LDA (&72),Y:STA (&74),Y:INY � CPY #&40:BNE loop2 � RTS � \ Checks for end � \ of message � .lx LDA &70:CMP &76 � BEQ xl:RTS \ Checks for inverse .invon LDA #&FF:STA &78 INC &70:JMP prg & .invoff LDA #&0:STA &78 0 INC &70:JMP prg : RTS D" .xl LDA #lo%:STA &70:LDA #hi% N STA &71:INC &70:JMP prg X .rts RTS b \ Print triple l \ height letter v .tblh �H LDA &88:� &78:STA &7FFF:STA &7FFE:STA &7FFD:LDA &87:� &78:STA &7FFC �: STA &7FFB:STA &7FFA:LDA &86:� &78:STA &7FF9:STA &7FF8 �H STA &7EBF:LDA &85:� &78:STA &7EBE:STA &7EBD:STA &7EBC:LDA &84:� &78 �: STA &7EBB:STA &7EBA:STA &7EB9:LDA &83:� &78:STA &7EB8 �D STA &7D7F:STA &7D7E:LDA &82:� &78:STA &7D7D:STA &7D7C:STA &7D7B �4 LDA &81:� &78:STA &7D7A:STA &7D79:STA &7D78:RTS � .scrolling � LDA #&7D:STA &75:STA &73 � LDA #&78:STA &74 � LDA #&80:STA &72:RTS � .drw � LDA #&7E:STA &75:STA &73 � LDA #&C0:STA &74 LDA #&C8:STA &72:RTS .scr LDA #&7C:STA &75:STA &73 LDA #&40:STA &74:LDA #&48 * STA &72:RTS 4 .times LDA #0:STA &8C > LDA &80:SEC:SBC #32 H \ Multiply by 8 R STA &8B:CLC:ASL &8B:ROL &8C \$ ASL &8B:ROL &8C:ASL &8B:ROL &8C f .scan p \ Get char def z \ from ROM �$ LDA #0:STA &8E:LDA #&C0:STA &8F � CLC:LDA &8B:ADC &8E:STA &8E � LDA &8C:ADC &8F:STA &8F � .do LDY #0:LDX #0 � .dlp LDA (&8E),Y:STA &81,X � INY:INX:CPX #8:BNE dlp:RTS � :]:� � ?&220=0:?&221=&9:*FX14,4 � �12,14);"SCROLLING TEXT" � �17,16);"DEMO" � *FX15,1 � � 12,1:� 1,1,100,-1:flg%=0 � �:� li%=464 � 596 � 8 � 0,li%:� 1278,li% ' � 1,1,-1,1,?&240,1,1,4,0,0,0,0,0,0 � �(0)=32 li%=1024:flg%=1 $ �:� flg%=1 . � 7:*FX13,4 8 �:� 23,1,1,0;0;0;0;:� B � �read(pointer%) L start%=&3000:end%=&3200 V lo%=start% � 256 ` hi%=start% � 256 j fi%=end% � 256 t sh%=end% � 256 ~ ?&70=lo%:?&71=hi% � ?&76=fi%:?&77=sh% � � f%=start% � end%:?f%=32:� � v%=start% � � r%=0 � pointer%:� f$ � � mem%=1 � �(f$) � dat%=v%+mem% � ?dat%=�(�f$,mem%,1)) � � � v%=v%+(mem%-1) � � � � Poke inverse data � ?&3182=1:?&3194=2 ?&78=0 � d � " As you can see, this is a demonstration of smooth (and fast!) horizontal scrolling... " � � "The code works in mode 4 only and (at least in theory) is able to scroll a message of up to 65536 bytes (64k), which is more space than you are ever likely to need... " (a � " You could have scrolling messages in high score tables, demos and 1001 other uses..." 2/ � " It can also display your message in " <8 � " inverse video... How about that then ? ... " FD � " Type *FX13,4 to stop the scrolling... Thats all folks..." �
00000000 0d 00 0a 10 20 f4 20 42 69 67 73 63 72 6f 6c 6c |.... . Bigscroll| 00000010 0d 00 14 15 20 f4 20 42 79 20 52 2e 48 65 6e 64 |.... . By R.Hend| 00000020 65 72 73 6f 6e 0d 00 1e 18 20 f4 20 28 63 29 20 |erson.... . (c) | 00000030 45 6c 65 63 74 72 6f 6e 20 55 73 65 72 0d 00 28 |Electron User..(| 00000040 0e 20 eb 20 34 3a 2a 46 58 31 36 0d 00 32 14 20 |. . 4:*FX16..2. | 00000050 ef 20 32 33 2c 31 2c 30 3b 30 3b 30 3b 30 3b 0d |. 23,1,0;0;0;0;.| 00000060 00 3c 0b 20 2a 46 58 31 37 38 0d 00 46 0d 20 f2 |.<. *FX178..F. .| 00000070 72 65 61 64 28 35 29 0d 00 50 0c 20 d3 3d 26 33 |read(5)..P. .=&3| 00000080 30 30 30 0d 00 5a 18 20 f4 20 4d 61 69 6e 20 6d |000..Z. . Main m| 00000090 61 63 68 69 6e 65 20 63 6f 64 65 0d 00 64 13 20 |achine code..d. | 000000a0 e3 20 69 25 3d 30 20 b8 20 32 20 88 20 32 0d 00 |. i%=0 . 2 . 2..| 000000b0 6e 0c 20 50 25 3d 26 39 30 30 0d 00 78 0e 20 5b |n. P%=&900..x. [| 000000c0 20 4f 50 54 20 69 25 20 0d 00 82 15 20 5c 20 53 | OPT i% .... \ S| 000000d0 61 76 65 20 72 65 67 69 73 74 65 72 73 0d 00 8c |ave registers...| 000000e0 18 20 2e 6a 70 20 53 54 41 20 26 37 39 3a 53 54 |. .jp STA &79:ST| 000000f0 58 20 26 37 41 0d 00 96 10 20 53 54 59 20 26 37 |X &7A.... STY &7| 00000100 42 3a 43 4c 44 0d 00 a0 0a 20 2e 74 65 78 74 0d |B:CLD.... .text.| 00000110 00 aa 1b 20 4c 44 41 20 26 37 31 3a 43 4d 50 20 |... LDA &71:CMP | 00000120 26 37 37 3a 42 45 51 20 6c 78 0d 00 b4 14 20 49 |&77:BEQ lx.... I| 00000130 4e 43 20 26 37 30 3a 42 4e 45 20 70 72 67 0d 00 |NC &70:BNE prg..| 00000140 be 0c 20 49 4e 43 20 26 37 31 0d 00 c8 15 20 5c |.. INC &71.... \| 00000150 20 47 65 74 20 6c 65 74 74 65 72 20 61 6e 64 0d | Get letter and.| 00000160 00 d2 18 20 5c 20 73 74 6f 72 65 20 62 69 74 20 |... \ store bit | 00000170 70 61 74 74 65 72 6e 0d 00 dc 09 20 2e 70 72 67 |pattern.... .prg| 00000180 0d 00 e6 17 20 4c 44 59 20 23 30 3a 4c 44 41 20 |.... LDY #0:LDA | 00000190 28 26 37 30 29 2c 59 0d 00 f0 15 20 43 4d 50 20 |(&70),Y.... CMP | 000001a0 23 31 3a 42 45 51 20 69 6e 76 6f 6e 0d 00 fa 16 |#1:BEQ invon....| 000001b0 20 43 4d 50 20 23 32 3a 42 45 51 20 69 6e 76 6f | CMP #2:BEQ invo| 000001c0 66 66 0d 01 04 16 20 53 54 41 20 26 38 30 3a 4a |ff.... STA &80:J| 000001d0 53 52 20 74 69 6d 65 73 0d 01 0e 15 20 5c 20 43 |SR times.... \ C| 000001e0 61 6c 6c 20 73 63 72 6f 6c 6c 69 6e 67 0d 01 18 |all scrolling...| 000001f0 12 20 5c 20 73 75 62 72 6f 75 74 69 6e 65 73 0d |. \ subroutines.| 00000200 01 22 0b 20 2e 73 63 73 6c 31 0d 01 2c 1b 20 4a |.". .scsl1..,. J| 00000210 53 52 20 73 63 72 6f 6c 6c 69 6e 67 3a 4a 53 52 |SR scrolling:JSR| 00000220 20 6c 6f 6f 70 0d 01 36 14 20 4a 53 52 20 73 63 | loop..6. JSR sc| 00000230 72 3a 4a 53 52 20 78 79 7a 0d 01 40 1d 20 4a 53 |r:JSR xyz..@. JS| 00000240 52 20 64 72 77 3a 4a 53 52 20 78 79 7a 3a 4a 53 |R drw:JSR xyz:JS| 00000250 52 20 74 62 6c 68 0d 01 4a 18 20 5c 20 52 65 73 |R tblh..J. \ Res| 00000260 74 6f 72 65 20 72 65 67 69 73 74 65 72 73 0d 01 |tore registers..| 00000270 54 0f 20 5c 20 61 6e 64 20 71 75 69 74 0d 01 5e |T. \ and quit..^| 00000280 14 20 4c 44 59 20 26 37 42 3a 4c 44 58 20 26 37 |. LDY &7B:LDX &7| 00000290 41 0d 01 68 10 20 4c 44 41 20 26 37 39 3a 52 54 |A..h. LDA &79:RT| 000002a0 53 0d 01 72 19 20 5c 20 53 63 72 6f 6c 6c 20 74 |S..r. \ Scroll t| 000002b0 68 65 20 6d 65 73 73 61 67 65 0d 01 7c 09 20 2e |he message..|. .| 000002c0 78 79 7a 0d 01 86 0b 20 4c 44 59 20 23 30 0d 01 |xyz.... LDY #0..| 000002d0 90 0a 20 2e 6c 6f 6f 70 0d 01 9a 1c 20 4c 44 41 |.. .loop.... LDA| 000002e0 20 28 26 37 32 29 2c 59 3a 53 54 41 20 28 26 37 | (&72),Y:STA (&7| 000002f0 34 29 2c 59 0d 01 a4 11 20 49 4e 59 3a 42 4e 45 |4),Y.... INY:BNE| 00000300 20 6c 6f 6f 70 0d 01 ae 14 20 49 4e 43 20 26 37 | loop.... INC &7| 00000310 35 3a 49 4e 43 20 26 37 33 0d 01 b8 0b 20 2e 6c |5:INC &73.... .l| 00000320 6f 6f 70 32 0d 01 c2 20 20 4c 44 41 20 28 26 37 |oop2... LDA (&7| 00000330 32 29 2c 59 3a 53 54 41 20 28 26 37 34 29 2c 59 |2),Y:STA (&74),Y| 00000340 3a 49 4e 59 0d 01 cc 17 20 43 50 59 20 23 26 34 |:INY.... CPY #&4| 00000350 30 3a 42 4e 45 20 6c 6f 6f 70 32 0d 01 d6 08 20 |0:BNE loop2.... | 00000360 52 54 53 0d 01 e0 15 20 5c 20 43 68 65 63 6b 73 |RTS.... \ Checks| 00000370 20 66 6f 72 20 65 6e 64 0d 01 ea 11 20 5c 20 6f | for end.... \ o| 00000380 66 20 6d 65 73 73 61 67 65 0d 01 f4 18 20 2e 6c |f message.... .l| 00000390 78 20 4c 44 41 20 26 37 30 3a 43 4d 50 20 26 37 |x LDA &70:CMP &7| 000003a0 36 0d 01 fe 0f 20 42 45 51 20 78 6c 3a 52 54 53 |6.... BEQ xl:RTS| 000003b0 0d 02 08 19 20 5c 20 43 68 65 63 6b 73 20 66 6f |.... \ Checks fo| 000003c0 72 20 69 6e 76 65 72 73 65 0d 02 12 1c 20 2e 69 |r inverse.... .i| 000003d0 6e 76 6f 6e 20 4c 44 41 20 23 26 46 46 3a 53 54 |nvon LDA #&FF:ST| 000003e0 41 20 26 37 38 0d 02 1c 14 20 49 4e 43 20 26 37 |A &78.... INC &7| 000003f0 30 3a 4a 4d 50 20 70 72 67 0d 02 26 1c 20 2e 69 |0:JMP prg..&. .i| 00000400 6e 76 6f 66 66 20 4c 44 41 20 23 26 30 3a 53 54 |nvoff LDA #&0:ST| 00000410 41 20 26 37 38 0d 02 30 14 20 49 4e 43 20 26 37 |A &78..0. INC &7| 00000420 30 3a 4a 4d 50 20 70 72 67 0d 02 3a 08 20 52 54 |0:JMP prg..:. RT| 00000430 53 0d 02 44 22 20 2e 78 6c 20 4c 44 41 20 23 6c |S..D" .xl LDA #l| 00000440 6f 25 3a 53 54 41 20 26 37 30 3a 4c 44 41 20 23 |o%:STA &70:LDA #| 00000450 68 69 25 0d 02 4e 1c 20 53 54 41 20 26 37 31 3a |hi%..N. STA &71:| 00000460 49 4e 43 20 26 37 30 3a 4a 4d 50 20 70 72 67 0d |INC &70:JMP prg.| 00000470 02 58 0d 20 2e 72 74 73 20 52 54 53 0d 02 62 13 |.X. .rts RTS..b.| 00000480 20 5c 20 50 72 69 6e 74 20 74 72 69 70 6c 65 0d | \ Print triple.| 00000490 02 6c 14 20 5c 20 68 65 69 67 68 74 20 6c 65 74 |.l. \ height let| 000004a0 74 65 72 0d 02 76 0a 20 2e 74 62 6c 68 0d 02 80 |ter..v. .tblh...| 000004b0 48 20 4c 44 41 20 26 38 38 3a 82 20 26 37 38 3a |H LDA &88:. &78:| 000004c0 53 54 41 20 26 37 46 46 46 3a 53 54 41 20 26 37 |STA &7FFF:STA &7| 000004d0 46 46 45 3a 53 54 41 20 26 37 46 46 44 3a 4c 44 |FFE:STA &7FFD:LD| 000004e0 41 20 26 38 37 3a 82 20 26 37 38 3a 53 54 41 20 |A &87:. &78:STA | 000004f0 26 37 46 46 43 0d 02 8a 3a 20 53 54 41 20 26 37 |&7FFC...: STA &7| 00000500 46 46 42 3a 53 54 41 20 26 37 46 46 41 3a 4c 44 |FFB:STA &7FFA:LD| 00000510 41 20 26 38 36 3a 82 20 26 37 38 3a 53 54 41 20 |A &86:. &78:STA | 00000520 26 37 46 46 39 3a 53 54 41 20 26 37 46 46 38 0d |&7FF9:STA &7FF8.| 00000530 02 94 48 20 53 54 41 20 26 37 45 42 46 3a 4c 44 |..H STA &7EBF:LD| 00000540 41 20 26 38 35 3a 82 20 26 37 38 3a 53 54 41 20 |A &85:. &78:STA | 00000550 26 37 45 42 45 3a 53 54 41 20 26 37 45 42 44 3a |&7EBE:STA &7EBD:| 00000560 53 54 41 20 26 37 45 42 43 3a 4c 44 41 20 26 38 |STA &7EBC:LDA &8| 00000570 34 3a 82 20 26 37 38 0d 02 9e 3a 20 53 54 41 20 |4:. &78...: STA | 00000580 26 37 45 42 42 3a 53 54 41 20 26 37 45 42 41 3a |&7EBB:STA &7EBA:| 00000590 53 54 41 20 26 37 45 42 39 3a 4c 44 41 20 26 38 |STA &7EB9:LDA &8| 000005a0 33 3a 82 20 26 37 38 3a 53 54 41 20 26 37 45 42 |3:. &78:STA &7EB| 000005b0 38 0d 02 a8 44 20 53 54 41 20 26 37 44 37 46 3a |8...D STA &7D7F:| 000005c0 53 54 41 20 26 37 44 37 45 3a 4c 44 41 20 26 38 |STA &7D7E:LDA &8| 000005d0 32 3a 82 20 26 37 38 3a 53 54 41 20 26 37 44 37 |2:. &78:STA &7D7| 000005e0 44 3a 53 54 41 20 26 37 44 37 43 3a 53 54 41 20 |D:STA &7D7C:STA | 000005f0 26 37 44 37 42 0d 02 b2 34 20 4c 44 41 20 26 38 |&7D7B...4 LDA &8| 00000600 31 3a 82 20 26 37 38 3a 53 54 41 20 26 37 44 37 |1:. &78:STA &7D7| 00000610 41 3a 53 54 41 20 26 37 44 37 39 3a 53 54 41 20 |A:STA &7D79:STA | 00000620 26 37 44 37 38 3a 52 54 53 0d 02 bc 0f 20 2e 73 |&7D78:RTS.... .s| 00000630 63 72 6f 6c 6c 69 6e 67 0d 02 c6 1d 20 4c 44 41 |crolling.... LDA| 00000640 20 23 26 37 44 3a 53 54 41 20 26 37 35 3a 53 54 | #&7D:STA &75:ST| 00000650 41 20 26 37 33 0d 02 d0 15 20 4c 44 41 20 23 26 |A &73.... LDA #&| 00000660 37 38 3a 53 54 41 20 26 37 34 0d 02 da 19 20 4c |78:STA &74.... L| 00000670 44 41 20 23 26 38 30 3a 53 54 41 20 26 37 32 3a |DA #&80:STA &72:| 00000680 52 54 53 0d 02 e4 09 20 2e 64 72 77 0d 02 ee 1d |RTS.... .drw....| 00000690 20 4c 44 41 20 23 26 37 45 3a 53 54 41 20 26 37 | LDA #&7E:STA &7| 000006a0 35 3a 53 54 41 20 26 37 33 0d 02 f8 15 20 4c 44 |5:STA &73.... LD| 000006b0 41 20 23 26 43 30 3a 53 54 41 20 26 37 34 0d 03 |A #&C0:STA &74..| 000006c0 02 19 20 4c 44 41 20 23 26 43 38 3a 53 54 41 20 |.. LDA #&C8:STA | 000006d0 26 37 32 3a 52 54 53 0d 03 0c 09 20 2e 73 63 72 |&72:RTS.... .scr| 000006e0 0d 03 16 1d 20 4c 44 41 20 23 26 37 43 3a 53 54 |.... LDA #&7C:ST| 000006f0 41 20 26 37 35 3a 53 54 41 20 26 37 33 0d 03 20 |A &75:STA &73.. | 00000700 1e 20 4c 44 41 20 23 26 34 30 3a 53 54 41 20 26 |. LDA #&40:STA &| 00000710 37 34 3a 4c 44 41 20 23 26 34 38 0d 03 2a 10 20 |74:LDA #&48..*. | 00000720 53 54 41 20 26 37 32 3a 52 54 53 0d 03 34 1a 20 |STA &72:RTS..4. | 00000730 2e 74 69 6d 65 73 20 4c 44 41 20 23 30 3a 53 54 |.times LDA #0:ST| 00000740 41 20 26 38 43 0d 03 3e 18 20 4c 44 41 20 26 38 |A &8C..>. LDA &8| 00000750 30 3a 53 45 43 3a 53 42 43 20 23 33 32 0d 03 48 |0:SEC:SBC #32..H| 00000760 14 20 5c 20 4d 75 6c 74 69 70 6c 79 20 62 79 20 |. \ Multiply by | 00000770 38 0d 03 52 20 20 53 54 41 20 26 38 42 3a 43 4c |8..R STA &8B:CL| 00000780 43 3a 41 53 4c 20 26 38 42 3a 52 4f 4c 20 26 38 |C:ASL &8B:ROL &8| 00000790 43 0d 03 5c 24 20 41 53 4c 20 26 38 42 3a 52 4f |C..\$ ASL &8B:RO| 000007a0 4c 20 26 38 43 3a 41 53 4c 20 26 38 42 3a 52 4f |L &8C:ASL &8B:RO| 000007b0 4c 20 26 38 43 0d 03 66 0a 20 2e 73 63 61 6e 0d |L &8C..f. .scan.| 000007c0 03 70 13 20 5c 20 47 65 74 20 63 68 61 72 20 64 |.p. \ Get char d| 000007d0 65 66 0d 03 7a 0f 20 5c 20 66 72 6f 6d 20 52 4f |ef..z. \ from RO| 000007e0 4d 0d 03 84 24 20 4c 44 41 20 23 30 3a 53 54 41 |M...$ LDA #0:STA| 000007f0 20 26 38 45 3a 4c 44 41 20 23 26 43 30 3a 53 54 | &8E:LDA #&C0:ST| 00000800 41 20 26 38 46 0d 03 8e 20 20 43 4c 43 3a 4c 44 |A &8F... CLC:LD| 00000810 41 20 26 38 42 3a 41 44 43 20 26 38 45 3a 53 54 |A &8B:ADC &8E:ST| 00000820 41 20 26 38 45 0d 03 98 1c 20 4c 44 41 20 26 38 |A &8E.... LDA &8| 00000830 43 3a 41 44 43 20 26 38 46 3a 53 54 41 20 26 38 |C:ADC &8F:STA &8| 00000840 46 0d 03 a2 16 20 2e 64 6f 20 4c 44 59 20 23 30 |F.... .do LDY #0| 00000850 3a 4c 44 58 20 23 30 0d 03 ac 1f 20 2e 64 6c 70 |:LDX #0.... .dlp| 00000860 20 4c 44 41 20 28 26 38 45 29 2c 59 3a 53 54 41 | LDA (&8E),Y:STA| 00000870 20 26 38 31 2c 58 0d 03 b6 1f 20 49 4e 59 3a 49 | &81,X.... INY:I| 00000880 4e 58 3a 43 50 58 20 23 38 3a 42 4e 45 20 64 6c |NX:CPX #8:BNE dl| 00000890 70 3a 52 54 53 0d 03 c0 09 20 3a 5d 3a ed 0d 03 |p:RTS.... :]:...| 000008a0 ca 1d 20 3f 26 32 32 30 3d 30 3a 3f 26 32 32 31 |.. ?&220=0:?&221| 000008b0 3d 26 39 3a 2a 46 58 31 34 2c 34 0d 03 d4 1e 20 |=&9:*FX14,4.... | 000008c0 f1 8a 31 32 2c 31 34 29 3b 22 53 43 52 4f 4c 4c |..12,14);"SCROLL| 000008d0 49 4e 47 20 54 45 58 54 22 0d 03 de 14 20 f1 8a |ING TEXT".... ..| 000008e0 31 37 2c 31 36 29 3b 22 44 45 4d 4f 22 0d 03 e8 |17,16);"DEMO"...| 000008f0 0c 20 2a 46 58 31 35 2c 31 0d 03 f2 1f 20 e6 20 |. *FX15,1.... . | 00000900 31 32 2c 31 3a d4 20 31 2c 31 2c 31 30 30 2c 2d |12,1:. 1,1,100,-| 00000910 31 3a 66 6c 67 25 3d 30 0d 03 fc 1a 20 f5 3a e3 |1:flg%=0.... .:.| 00000920 20 6c 69 25 3d 34 36 34 20 b8 20 35 39 36 20 88 | li%=464 . 596 .| 00000930 20 38 0d 04 06 17 20 ec 20 30 2c 6c 69 25 3a df | 8.... . 0,li%:.| 00000940 20 31 32 37 38 2c 6c 69 25 0d 04 10 27 20 e2 20 | 1278,li%...' . | 00000950 31 2c 31 2c 2d 31 2c 31 2c 3f 26 32 34 30 2c 31 |1,1,-1,1,?&240,1| 00000960 2c 31 2c 34 2c 30 2c 30 2c 30 2c 30 2c 30 2c 30 |,1,4,0,0,0,0,0,0| 00000970 0d 04 1a 1e 20 e7 20 a6 28 30 29 3d 33 32 20 6c |.... . .(0)=32 l| 00000980 69 25 3d 31 30 32 34 3a 66 6c 67 25 3d 31 0d 04 |i%=1024:flg%=1..| 00000990 24 0f 20 ed 3a fd 20 66 6c 67 25 3d 31 0d 04 2e |$. .:. flg%=1...| 000009a0 10 20 ef 20 37 3a 2a 46 58 31 33 2c 34 0d 04 38 |. . 7:*FX13,4..8| 000009b0 1a 20 db 3a ef 20 32 33 2c 31 2c 31 2c 30 3b 30 |. .:. 23,1,1,0;0| 000009c0 3b 30 3b 30 3b 3a e0 0d 04 42 17 20 dd 20 f2 72 |;0;0;:...B. . .r| 000009d0 65 61 64 28 70 6f 69 6e 74 65 72 25 29 20 0d 04 |ead(pointer%) ..| 000009e0 4c 1c 20 73 74 61 72 74 25 3d 26 33 30 30 30 3a |L. start%=&3000:| 000009f0 65 6e 64 25 3d 26 33 32 30 30 0d 04 56 15 20 6c |end%=&3200..V. l| 00000a00 6f 25 3d 73 74 61 72 74 25 20 83 20 32 35 36 0d |o%=start% . 256.| 00000a10 04 60 15 20 68 69 25 3d 73 74 61 72 74 25 20 81 |.`. hi%=start% .| 00000a20 20 32 35 36 0d 04 6a 13 20 66 69 25 3d 65 6e 64 | 256..j. fi%=end| 00000a30 25 20 83 20 32 35 36 0d 04 74 13 20 73 68 25 3d |% . 256..t. sh%=| 00000a40 65 6e 64 25 20 81 20 32 35 36 0d 04 7e 16 20 3f |end% . 256..~. ?| 00000a50 26 37 30 3d 6c 6f 25 3a 3f 26 37 31 3d 68 69 25 |&70=lo%:?&71=hi%| 00000a60 0d 04 88 16 20 3f 26 37 36 3d 66 69 25 3a 3f 26 |.... ?&76=fi%:?&| 00000a70 37 37 3d 73 68 25 0d 04 92 20 20 e3 20 66 25 3d |77=sh%... . f%=| 00000a80 73 74 61 72 74 25 20 b8 20 65 6e 64 25 3a 3f 66 |start% . end%:?f| 00000a90 25 3d 33 32 3a ed 0d 04 9c 0e 20 76 25 3d 73 74 |%=32:..... v%=st| 00000aa0 61 72 74 25 0d 04 a6 1b 20 e3 20 72 25 3d 30 20 |art%.... . r%=0 | 00000ab0 b8 20 70 6f 69 6e 74 65 72 25 3a f3 20 66 24 0d |. pointer%:. f$.| 00000ac0 04 b0 15 20 e3 20 6d 65 6d 25 3d 31 20 b8 20 a9 |... . mem%=1 . .| 00000ad0 28 66 24 29 0d 04 ba 11 20 64 61 74 25 3d 76 25 |(f$).... dat%=v%| 00000ae0 2b 6d 65 6d 25 0d 04 c4 19 20 3f 64 61 74 25 3d |+mem%.... ?dat%=| 00000af0 97 28 c1 66 24 2c 6d 65 6d 25 2c 31 29 29 0d 04 |.(.f$,mem%,1))..| 00000b00 ce 06 20 ed 0d 04 d8 13 20 76 25 3d 76 25 2b 28 |.. ..... v%=v%+(| 00000b10 6d 65 6d 25 2d 31 29 0d 04 e2 06 20 ed 0d 04 ec |mem%-1).... ....| 00000b20 18 20 f4 20 50 6f 6b 65 20 69 6e 76 65 72 73 65 |. . Poke inverse| 00000b30 20 64 61 74 61 0d 04 f6 16 20 3f 26 33 31 38 32 | data.... ?&3182| 00000b40 3d 31 3a 3f 26 33 31 39 34 3d 32 0d 05 00 0b 20 |=1:?&3194=2.... | 00000b50 3f 26 37 38 3d 30 0d 05 0a 06 20 e1 0d 05 14 64 |?&78=0.... ....d| 00000b60 20 dc 20 22 20 20 41 73 20 79 6f 75 20 63 61 6e | . " As you can| 00000b70 20 73 65 65 2c 20 74 68 69 73 20 69 73 20 61 20 | see, this is a | 00000b80 64 65 6d 6f 6e 73 74 72 61 74 69 6f 6e 20 6f 66 |demonstration of| 00000b90 20 73 6d 6f 6f 74 68 20 28 61 6e 64 20 66 61 73 | smooth (and fas| 00000ba0 74 21 29 20 68 6f 72 69 7a 6f 6e 74 61 6c 20 73 |t!) horizontal s| 00000bb0 63 72 6f 6c 6c 69 6e 67 2e 2e 2e 20 20 20 20 22 |crolling... "| 00000bc0 0d 05 1e b0 20 dc 20 22 54 68 65 20 63 6f 64 65 |.... . "The code| 00000bd0 20 77 6f 72 6b 73 20 69 6e 20 6d 6f 64 65 20 34 | works in mode 4| 00000be0 20 6f 6e 6c 79 20 61 6e 64 20 28 61 74 20 6c 65 | only and (at le| 00000bf0 61 73 74 20 69 6e 20 74 68 65 6f 72 79 29 20 69 |ast in theory) i| 00000c00 73 20 61 62 6c 65 20 74 6f 20 73 63 72 6f 6c 6c |s able to scroll| 00000c10 20 61 20 6d 65 73 73 61 67 65 20 6f 66 20 75 70 | a message of up| 00000c20 20 74 6f 20 36 35 35 33 36 20 62 79 74 65 73 20 | to 65536 bytes | 00000c30 28 36 34 6b 29 2c 20 77 68 69 63 68 20 69 73 20 |(64k), which is | 00000c40 6d 6f 72 65 20 73 70 61 63 65 20 74 68 61 6e 20 |more space than | 00000c50 79 6f 75 20 61 72 65 20 65 76 65 72 20 6c 69 6b |you are ever lik| 00000c60 65 6c 79 20 74 6f 20 6e 65 65 64 2e 2e 2e 20 22 |ely to need... "| 00000c70 0d 05 28 61 20 dc 20 22 20 20 20 20 59 6f 75 20 |..(a . " You | 00000c80 63 6f 75 6c 64 20 68 61 76 65 20 73 63 72 6f 6c |could have scrol| 00000c90 6c 69 6e 67 20 6d 65 73 73 61 67 65 73 20 69 6e |ling messages in| 00000ca0 20 68 69 67 68 20 73 63 6f 72 65 20 74 61 62 6c | high score tabl| 00000cb0 65 73 2c 20 64 65 6d 6f 73 20 61 6e 64 20 31 30 |es, demos and 10| 00000cc0 30 31 20 6f 74 68 65 72 20 75 73 65 73 2e 2e 2e |01 other uses...| 00000cd0 22 0d 05 32 2f 20 dc 20 22 20 49 74 20 63 61 6e |"..2/ . " It can| 00000ce0 20 61 6c 73 6f 20 64 69 73 70 6c 61 79 20 79 6f | also display yo| 00000cf0 75 72 20 6d 65 73 73 61 67 65 20 69 6e 20 20 22 |ur message in "| 00000d00 0d 05 3c 38 20 dc 20 22 20 20 69 6e 76 65 72 73 |..<8 . " invers| 00000d10 65 20 76 69 64 65 6f 2e 2e 2e 20 20 20 48 6f 77 |e video... How| 00000d20 20 61 62 6f 75 74 20 74 68 61 74 20 74 68 65 6e | about that then| 00000d30 20 3f 20 2e 2e 2e 20 22 0d 05 46 44 20 dc 20 22 | ? ... "..FD . "| 00000d40 20 54 79 70 65 20 2a 46 58 31 33 2c 34 20 74 6f | Type *FX13,4 to| 00000d50 20 73 74 6f 70 20 74 68 65 20 73 63 72 6f 6c 6c | stop the scroll| 00000d60 69 6e 67 2e 2e 2e 20 20 20 54 68 61 74 73 20 61 |ing... Thats a| 00000d70 6c 6c 20 66 6f 6c 6b 73 2e 2e 2e 22 0d ff |ll folks..."..| 00000d7e