Home » Archimedes archive » Acorn Computing » 1994 09.adf » 9409 » TechForum/DivMod10
TechForum/DivMod10
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 » Archimedes archive » Acorn Computing » 1994 09.adf » 9409 |
| Filename: | TechForum/DivMod10 |
| Read OK: | ✔ |
| File size: | 06F4 bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
10REM >DivMod10 20REM based on code by A F Reysenbach (c) BAU October 1992 30REM modified by mroz to output both quotient & remainder, plus to support negative numerator & fix bug 40REM allowing use with bit-30 set values 50REM for 32-bit machines 60: 70MODE 0 80DIM mod 1024 90a=0:b=1:c=2:d=3 100FOR pass%=0 TO 3 STEP 3 110P%=mod 120[ OPT pass% 130 ADDS a,b,b ;remove iff b always +'ve 140 RSBCS b,b,#0 ;remove iff b always +'ve 150 ADC d,d,d ;remove iff b always +'ve 160 ADD a,b,b,LSR #1 170 ADD a,a,a,LSR #4 180 ADD a,a,a,LSR #8 190 ADD a,a,a,LSR #16 200 MOV a,a,LSR #4 210 ADD c,a,a,ASL #2 220 SUB c,b,c,ASL #1 230 CMP c,#10 240 ADDGE a,a,#1 250 SUBGE c,c,#10 260 MOVS d,d,ASR #1 ;remove iff b always +'ve 270 RSBCS a,a,#0 ;remove iff b always +'ve 280 RSBCS c,c,#0 ;remove iff b always +'ve 290 RSBCS b,b,#0 ;remove iff don't need to preserve sign of b or b always +'ve 300 STR c, m% 310 MOV pc,R14 320.m% EQUD 0 330] 340NEXT 350B%=0 360REPEAT 370 B%=-B% 380 C%=USR(mod) 390 D%=B%DIV10: E%=B%MOD10 400 IF C%<>D% OR !m%<>E% PRINT"******************************************************************":VDU 7 410 PRINT B%,C%,!m%;" ", D%,E% 420 IF C%<>D% OR !m%<>E% PRINT"******************************************************************":VDU 7 430 B%=-B% 440 C%=USR(mod) 450 D%=B%DIV10: E%=B%MOD10 460 IF C%<>D% OR !m%<>E% PRINT"******************************************************************":VDU 7 470 PRINT B%,C%,!m%;" ", D%,E% 480 IF C%<>D% OR !m%<>E% PRINT"******************************************************************":VDU 7 490 B%+=1 500UNTIL FALSE 510END
� >DivMod10 :� based on code by A F Reysenbach (c) BAU October 1992 h� modified by mroz to output both quotient & remainder, plus to support negative numerator & fix bug ()� allowing use with bit-30 set values 2� for 32-bit machines <: F� 0 P� mod 1024 Za=0:b=1:c=2:d=3 d� pass%=0 � 3 � 3 n P%=mod x[ OPT pass% �= ADDS a,b,b ;remove iff b always +'ve �= RSBCS b,b,#0 ;remove iff b always +'ve �= ADC d,d,d ;remove iff b always +'ve � ADD a,b,b,LSR #1 � ADD a,a,a,LSR #4 � ADD a,a,a,LSR #8 �! ADD a,a,a,LSR #16 � MOV a,a,LSR #4 � ADD c,a,a,ASL #2 � SUB c,b,c,ASL #1 � CMP c,#10 � ADDGE a,a,#1 � SUBGE c,c,#10 = MOVS d,d,ASR #1 ;remove iff b always +'ve = RSBCS a,a,#0 ;remove iff b always +'ve = RSBCS c,c,#0 ;remove iff b always +'ve "a RSBCS b,b,#0 ;remove iff don't need to preserve sign of b or b always +'ve , STR c, m% 6 MOV pc,R14 @.m% EQUD 0 J] T� ^B%=0 h� r B%=-B% | C%=�(mod) � D%=B%�10: E%=B%�10 �b � C%<>D% � !m%<>E% �"******************************************************************":� 7 � � B%,C%,!m%;" ", D%,E% �b � C%<>D% � !m%<>E% �"******************************************************************":� 7 � B%=-B% � C%=�(mod) � D%=B%�10: E%=B%�10 �b � C%<>D% � !m%<>E% �"******************************************************************":� 7 � � B%,C%,!m%;" ", D%,E% �b � C%<>D% � !m%<>E% �"******************************************************************":� 7 � B%+=1 �� � �� �
00000000 0d 00 0a 0f f4 20 3e 44 69 76 4d 6f 64 31 30 0d |..... >DivMod10.| 00000010 00 14 3a f4 20 62 61 73 65 64 20 6f 6e 20 63 6f |..:. based on co| 00000020 64 65 20 62 79 20 41 20 46 20 52 65 79 73 65 6e |de by A F Reysen| 00000030 62 61 63 68 20 28 63 29 20 42 41 55 20 4f 63 74 |bach (c) BAU Oct| 00000040 6f 62 65 72 20 31 39 39 32 0d 00 1e 68 f4 20 6d |ober 1992...h. m| 00000050 6f 64 69 66 69 65 64 20 62 79 20 6d 72 6f 7a 20 |odified by mroz | 00000060 74 6f 20 6f 75 74 70 75 74 20 62 6f 74 68 20 71 |to output both q| 00000070 75 6f 74 69 65 6e 74 20 26 20 72 65 6d 61 69 6e |uotient & remain| 00000080 64 65 72 2c 20 70 6c 75 73 20 74 6f 20 73 75 70 |der, plus to sup| 00000090 70 6f 72 74 20 6e 65 67 61 74 69 76 65 20 6e 75 |port negative nu| 000000a0 6d 65 72 61 74 6f 72 20 26 20 66 69 78 20 62 75 |merator & fix bu| 000000b0 67 0d 00 28 29 f4 20 61 6c 6c 6f 77 69 6e 67 20 |g..(). allowing | 000000c0 75 73 65 20 77 69 74 68 20 62 69 74 2d 33 30 20 |use with bit-30 | 000000d0 73 65 74 20 76 61 6c 75 65 73 0d 00 32 19 f4 20 |set values..2.. | 000000e0 66 6f 72 20 33 32 2d 62 69 74 20 6d 61 63 68 69 |for 32-bit machi| 000000f0 6e 65 73 0d 00 3c 05 3a 0d 00 46 07 eb 20 30 0d |nes..<.:..F.. 0.| 00000100 00 50 0e de 20 6d 6f 64 20 31 30 32 34 0d 00 5a |.P.. mod 1024..Z| 00000110 13 61 3d 30 3a 62 3d 31 3a 63 3d 32 3a 64 3d 33 |.a=0:b=1:c=2:d=3| 00000120 0d 00 64 15 e3 20 70 61 73 73 25 3d 30 20 b8 20 |..d.. pass%=0 . | 00000130 33 20 88 20 33 0d 00 6e 0a 50 25 3d 6d 6f 64 0d |3 . 3..n.P%=mod.| 00000140 00 78 19 5b 20 20 20 20 20 20 20 4f 50 54 20 20 |.x.[ OPT | 00000150 20 20 20 70 61 73 73 25 0d 00 82 3d 20 20 20 20 | pass%...= | 00000160 20 20 20 20 41 44 44 53 20 20 20 20 61 2c 62 2c | ADDS a,b,| 00000170 62 20 20 20 20 20 20 20 20 20 20 20 3b 72 65 6d |b ;rem| 00000180 6f 76 65 20 69 66 66 20 62 20 61 6c 77 61 79 73 |ove iff b always| 00000190 20 2b 27 76 65 0d 00 8c 3d 20 20 20 20 20 20 20 | +'ve...= | 000001a0 20 52 53 42 43 53 20 20 20 62 2c 62 2c 23 30 20 | RSBCS b,b,#0 | 000001b0 20 20 20 20 20 20 20 20 20 3b 72 65 6d 6f 76 65 | ;remove| 000001c0 20 69 66 66 20 62 20 61 6c 77 61 79 73 20 2b 27 | iff b always +'| 000001d0 76 65 0d 00 96 3d 20 20 20 20 20 20 20 20 41 44 |ve...= AD| 000001e0 43 20 20 20 20 20 64 2c 64 2c 64 20 20 20 20 20 |C d,d,d | 000001f0 20 20 20 20 20 20 3b 72 65 6d 6f 76 65 20 69 66 | ;remove if| 00000200 66 20 62 20 61 6c 77 61 79 73 20 2b 27 76 65 0d |f b always +'ve.| 00000210 00 a0 20 20 20 20 20 20 20 20 20 41 44 44 20 20 |.. ADD | 00000220 20 20 20 61 2c 62 2c 62 2c 4c 53 52 20 23 31 0d | a,b,b,LSR #1.| 00000230 00 aa 20 20 20 20 20 20 20 20 20 41 44 44 20 20 |.. ADD | 00000240 20 20 20 61 2c 61 2c 61 2c 4c 53 52 20 23 34 0d | a,a,a,LSR #4.| 00000250 00 b4 20 20 20 20 20 20 20 20 20 41 44 44 20 20 |.. ADD | 00000260 20 20 20 61 2c 61 2c 61 2c 4c 53 52 20 23 38 0d | a,a,a,LSR #8.| 00000270 00 be 21 20 20 20 20 20 20 20 20 41 44 44 20 20 |..! ADD | 00000280 20 20 20 61 2c 61 2c 61 2c 4c 53 52 20 23 31 36 | a,a,a,LSR #16| 00000290 0d 00 c8 1e 20 20 20 20 20 20 20 20 4d 4f 56 20 |.... MOV | 000002a0 20 20 20 20 61 2c 61 2c 4c 53 52 20 23 34 0d 00 | a,a,LSR #4..| 000002b0 d2 20 20 20 20 20 20 20 20 20 41 44 44 20 20 20 |. ADD | 000002c0 20 20 63 2c 61 2c 61 2c 41 53 4c 20 23 32 0d 00 | c,a,a,ASL #2..| 000002d0 dc 20 20 20 20 20 20 20 20 20 53 55 42 20 20 20 |. SUB | 000002e0 20 20 63 2c 62 2c 63 2c 41 53 4c 20 23 31 0d 00 | c,b,c,ASL #1..| 000002f0 e6 19 20 20 20 20 20 20 20 20 43 4d 50 20 20 20 |.. CMP | 00000300 20 20 63 2c 23 31 30 0d 00 f0 1a 20 20 20 20 20 | c,#10.... | 00000310 20 20 20 41 44 44 47 45 20 20 20 61 2c 61 2c 23 | ADDGE a,a,#| 00000320 31 0d 00 fa 1b 20 20 20 20 20 20 20 20 53 55 42 |1.... SUB| 00000330 47 45 20 20 20 63 2c 63 2c 23 31 30 0d 01 04 3d |GE c,c,#10...=| 00000340 20 20 20 20 20 20 20 20 4d 4f 56 53 20 20 20 20 | MOVS | 00000350 64 2c 64 2c 41 53 52 20 23 31 20 20 20 20 20 20 |d,d,ASR #1 | 00000360 3b 72 65 6d 6f 76 65 20 69 66 66 20 62 20 61 6c |;remove iff b al| 00000370 77 61 79 73 20 2b 27 76 65 0d 01 0e 3d 20 20 20 |ways +'ve...= | 00000380 20 20 20 20 20 52 53 42 43 53 20 20 20 61 2c 61 | RSBCS a,a| 00000390 2c 23 30 20 20 20 20 20 20 20 20 20 20 3b 72 65 |,#0 ;re| 000003a0 6d 6f 76 65 20 69 66 66 20 62 20 61 6c 77 61 79 |move iff b alway| 000003b0 73 20 2b 27 76 65 0d 01 18 3d 20 20 20 20 20 20 |s +'ve...= | 000003c0 20 20 52 53 42 43 53 20 20 20 63 2c 63 2c 23 30 | RSBCS c,c,#0| 000003d0 20 20 20 20 20 20 20 20 20 20 3b 72 65 6d 6f 76 | ;remov| 000003e0 65 20 69 66 66 20 62 20 61 6c 77 61 79 73 20 2b |e iff b always +| 000003f0 27 76 65 0d 01 22 61 20 20 20 20 20 20 20 20 52 |'ve.."a R| 00000400 53 42 43 53 20 20 20 62 2c 62 2c 23 30 20 20 20 |SBCS b,b,#0 | 00000410 20 20 20 20 20 20 20 3b 72 65 6d 6f 76 65 20 69 | ;remove i| 00000420 66 66 20 64 6f 6e 27 74 20 6e 65 65 64 20 74 6f |ff don't need to| 00000430 20 70 72 65 73 65 72 76 65 20 73 69 67 6e 20 6f | preserve sign o| 00000440 66 20 62 20 6f 72 20 62 20 61 6c 77 61 79 73 20 |f b or b always | 00000450 2b 27 76 65 0d 01 2c 19 20 20 20 20 20 20 20 20 |+'ve..,. | 00000460 53 54 52 20 20 20 20 20 63 2c 20 6d 25 0d 01 36 |STR c, m%..6| 00000470 1a 20 20 20 20 20 20 20 20 4d 4f 56 20 20 20 20 |. MOV | 00000480 20 70 63 2c 52 31 34 0d 01 40 15 2e 6d 25 20 20 | pc,R14..@..m% | 00000490 20 20 20 45 51 55 44 20 20 20 20 30 0d 01 4a 05 | EQUD 0..J.| 000004a0 5d 0d 01 54 05 ed 0d 01 5e 08 42 25 3d 30 0d 01 |]..T....^.B%=0..| 000004b0 68 05 f5 0d 01 72 0c 20 20 42 25 3d 2d 42 25 0d |h....r. B%=-B%.| 000004c0 01 7c 0f 20 20 43 25 3d ba 28 6d 6f 64 29 0d 01 |.|. C%=.(mod)..| 000004d0 86 18 20 20 44 25 3d 42 25 81 31 30 3a 20 45 25 |.. D%=B%.10: E%| 000004e0 3d 42 25 83 31 30 0d 01 90 62 20 20 e7 20 43 25 |=B%.10...b . C%| 000004f0 3c 3e 44 25 20 84 20 21 6d 25 3c 3e 45 25 20 f1 |<>D% . !m%<>E% .| 00000500 22 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a |"***************| 00000510 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a |****************| * 00000540 2a 2a 2a 22 3a ef 20 37 0d 01 9a 1d 20 20 f1 20 |***":. 7.... . | 00000550 42 25 2c 43 25 2c 21 6d 25 3b 22 20 20 22 2c 20 |B%,C%,!m%;" ", | 00000560 44 25 2c 45 25 0d 01 a4 62 20 20 e7 20 43 25 3c |D%,E%...b . C%<| 00000570 3e 44 25 20 84 20 21 6d 25 3c 3e 45 25 20 f1 22 |>D% . !m%<>E% ."| 00000580 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a |****************| * 000005c0 2a 2a 22 3a ef 20 37 0d 01 ae 0c 20 20 42 25 3d |**":. 7.... B%=| 000005d0 2d 42 25 0d 01 b8 0f 20 20 43 25 3d ba 28 6d 6f |-B%.... C%=.(mo| 000005e0 64 29 0d 01 c2 18 20 20 44 25 3d 42 25 81 31 30 |d).... D%=B%.10| 000005f0 3a 20 45 25 3d 42 25 83 31 30 0d 01 cc 62 20 20 |: E%=B%.10...b | 00000600 e7 20 43 25 3c 3e 44 25 20 84 20 21 6d 25 3c 3e |. C%<>D% . !m%<>| 00000610 45 25 20 f1 22 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a |E% ."***********| 00000620 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a |****************| * 00000650 2a 2a 2a 2a 2a 2a 2a 22 3a ef 20 37 0d 01 d6 1d |*******":. 7....| 00000660 20 20 f1 20 42 25 2c 43 25 2c 21 6d 25 3b 22 20 | . B%,C%,!m%;" | 00000670 20 22 2c 20 44 25 2c 45 25 0d 01 e0 62 20 20 e7 | ", D%,E%...b .| 00000680 20 43 25 3c 3e 44 25 20 84 20 21 6d 25 3c 3e 45 | C%<>D% . !m%<>E| 00000690 25 20 f1 22 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a |% ."************| 000006a0 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a |****************| * 000006d0 2a 2a 2a 2a 2a 2a 22 3a ef 20 37 0d 01 ea 0b 20 |******":. 7.... | 000006e0 20 42 25 2b 3d 31 0d 01 f4 07 fd 20 a3 0d 01 fe | B%+=1..... ....| 000006f0 05 e0 0d ff |....| 000006f4
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