Home » Archimedes archive » Acorn User » AU 1993-06.adf » !ArmCode/!Help
!ArmCode/!Help
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 User » AU 1993-06.adf |
| Filename: | !ArmCode/!Help |
| Read OK: | ✔ |
| File size: | 0525 bytes |
| Load address: | FFFFFF44 |
| Exec address: | 8D8C7D78 |
File contents
Assembly Line By Dave Lawrence Run this application to open a directory containing six Basic programs. Arm1 demonstrates how to multiply two real numbers in Arm code. When it is run, the program will ask for two numbers, and will display the result of multiplying them both in Basic and in assembler. Arm2 shows how to implement integer division in assembler. The program asks for two integers: the first number will be divided by the second. The results are shown from Basic and assembler. Arm3 provides a routine to calculate integer square roots in assembler. The program displays three columns of numbers: the first is an integer, the second is the square root of that number returned by the assembly routine, and the third is the square root calculated by Basic. Arm4 demonstrates random number generation in assembler. The program fills the screen with black and white pixels, generated randomly. Arm5 continues the theme of random numbers by colouring random points in random colours. Arm6 shows how to determine the status flags on returning from a routine. When it is run, 'Z' and 'C' are displayed, showing that the Zero and Carry flags are set by the program. To experiment with the results, alter the line starting with MOVS. For more details, see page 105 in the magazine. � BBC Acorn User 1993
00000000 41 73 73 65 6d 62 6c 79 20 4c 69 6e 65 0a 42 79 |Assembly Line.By| 00000010 20 44 61 76 65 20 4c 61 77 72 65 6e 63 65 0a 0a | Dave Lawrence..| 00000020 52 75 6e 20 74 68 69 73 20 61 70 70 6c 69 63 61 |Run this applica| 00000030 74 69 6f 6e 20 74 6f 20 6f 70 65 6e 20 61 20 64 |tion to open a d| 00000040 69 72 65 63 74 6f 72 79 20 63 6f 6e 74 61 69 6e |irectory contain| 00000050 69 6e 67 20 73 69 78 20 42 61 73 69 63 20 70 72 |ing six Basic pr| 00000060 6f 67 72 61 6d 73 2e 0a 0a 41 72 6d 31 20 64 65 |ograms...Arm1 de| 00000070 6d 6f 6e 73 74 72 61 74 65 73 20 68 6f 77 20 74 |monstrates how t| 00000080 6f 20 6d 75 6c 74 69 70 6c 79 20 74 77 6f 20 72 |o multiply two r| 00000090 65 61 6c 20 6e 75 6d 62 65 72 73 20 69 6e 20 41 |eal numbers in A| 000000a0 72 6d 20 63 6f 64 65 2e 20 57 68 65 6e 20 69 74 |rm code. When it| 000000b0 20 69 73 20 72 75 6e 2c 20 74 68 65 20 70 72 6f | is run, the pro| 000000c0 67 72 61 6d 20 77 69 6c 6c 20 61 73 6b 20 66 6f |gram will ask fo| 000000d0 72 20 74 77 6f 20 6e 75 6d 62 65 72 73 2c 20 61 |r two numbers, a| 000000e0 6e 64 20 77 69 6c 6c 20 64 69 73 70 6c 61 79 20 |nd will display | 000000f0 74 68 65 20 72 65 73 75 6c 74 20 6f 66 20 6d 75 |the result of mu| 00000100 6c 74 69 70 6c 79 69 6e 67 20 74 68 65 6d 20 62 |ltiplying them b| 00000110 6f 74 68 20 69 6e 20 42 61 73 69 63 20 61 6e 64 |oth in Basic and| 00000120 20 69 6e 20 61 73 73 65 6d 62 6c 65 72 2e 0a 0a | in assembler...| 00000130 41 72 6d 32 20 73 68 6f 77 73 20 68 6f 77 20 74 |Arm2 shows how t| 00000140 6f 20 69 6d 70 6c 65 6d 65 6e 74 20 69 6e 74 65 |o implement inte| 00000150 67 65 72 20 64 69 76 69 73 69 6f 6e 20 69 6e 20 |ger division in | 00000160 61 73 73 65 6d 62 6c 65 72 2e 20 54 68 65 20 70 |assembler. The p| 00000170 72 6f 67 72 61 6d 20 61 73 6b 73 20 66 6f 72 20 |rogram asks for | 00000180 74 77 6f 20 69 6e 74 65 67 65 72 73 3a 20 74 68 |two integers: th| 00000190 65 20 66 69 72 73 74 20 6e 75 6d 62 65 72 20 77 |e first number w| 000001a0 69 6c 6c 20 62 65 20 64 69 76 69 64 65 64 20 62 |ill be divided b| 000001b0 79 20 74 68 65 20 73 65 63 6f 6e 64 2e 20 54 68 |y the second. Th| 000001c0 65 20 72 65 73 75 6c 74 73 20 61 72 65 20 73 68 |e results are sh| 000001d0 6f 77 6e 20 66 72 6f 6d 20 42 61 73 69 63 20 61 |own from Basic a| 000001e0 6e 64 20 61 73 73 65 6d 62 6c 65 72 2e 0a 0a 41 |nd assembler...A| 000001f0 72 6d 33 20 70 72 6f 76 69 64 65 73 20 61 20 72 |rm3 provides a r| 00000200 6f 75 74 69 6e 65 20 74 6f 20 63 61 6c 63 75 6c |outine to calcul| 00000210 61 74 65 20 69 6e 74 65 67 65 72 20 73 71 75 61 |ate integer squa| 00000220 72 65 20 72 6f 6f 74 73 20 69 6e 20 61 73 73 65 |re roots in asse| 00000230 6d 62 6c 65 72 2e 20 54 68 65 20 70 72 6f 67 72 |mbler. The progr| 00000240 61 6d 20 64 69 73 70 6c 61 79 73 20 74 68 72 65 |am displays thre| 00000250 65 20 63 6f 6c 75 6d 6e 73 20 6f 66 20 6e 75 6d |e columns of num| 00000260 62 65 72 73 3a 20 74 68 65 20 66 69 72 73 74 20 |bers: the first | 00000270 69 73 20 61 6e 20 69 6e 74 65 67 65 72 2c 20 74 |is an integer, t| 00000280 68 65 20 73 65 63 6f 6e 64 20 69 73 20 74 68 65 |he second is the| 00000290 20 73 71 75 61 72 65 20 72 6f 6f 74 20 6f 66 20 | square root of | 000002a0 74 68 61 74 20 6e 75 6d 62 65 72 20 72 65 74 75 |that number retu| 000002b0 72 6e 65 64 20 62 79 20 74 68 65 20 61 73 73 65 |rned by the asse| 000002c0 6d 62 6c 79 20 72 6f 75 74 69 6e 65 2c 20 61 6e |mbly routine, an| 000002d0 64 20 74 68 65 20 74 68 69 72 64 20 69 73 20 74 |d the third is t| 000002e0 68 65 20 73 71 75 61 72 65 20 72 6f 6f 74 20 63 |he square root c| 000002f0 61 6c 63 75 6c 61 74 65 64 20 62 79 20 42 61 73 |alculated by Bas| 00000300 69 63 2e 0a 0a 41 72 6d 34 20 64 65 6d 6f 6e 73 |ic...Arm4 demons| 00000310 74 72 61 74 65 73 20 72 61 6e 64 6f 6d 20 6e 75 |trates random nu| 00000320 6d 62 65 72 20 67 65 6e 65 72 61 74 69 6f 6e 20 |mber generation | 00000330 69 6e 20 61 73 73 65 6d 62 6c 65 72 2e 20 54 68 |in assembler. Th| 00000340 65 20 70 72 6f 67 72 61 6d 20 66 69 6c 6c 73 20 |e program fills | 00000350 74 68 65 20 73 63 72 65 65 6e 20 77 69 74 68 20 |the screen with | 00000360 62 6c 61 63 6b 20 61 6e 64 20 77 68 69 74 65 20 |black and white | 00000370 70 69 78 65 6c 73 2c 20 67 65 6e 65 72 61 74 65 |pixels, generate| 00000380 64 20 72 61 6e 64 6f 6d 6c 79 2e 0a 0a 41 72 6d |d randomly...Arm| 00000390 35 20 63 6f 6e 74 69 6e 75 65 73 20 74 68 65 20 |5 continues the | 000003a0 74 68 65 6d 65 20 6f 66 20 72 61 6e 64 6f 6d 20 |theme of random | 000003b0 6e 75 6d 62 65 72 73 20 62 79 20 63 6f 6c 6f 75 |numbers by colou| 000003c0 72 69 6e 67 20 72 61 6e 64 6f 6d 20 70 6f 69 6e |ring random poin| 000003d0 74 73 20 69 6e 20 72 61 6e 64 6f 6d 20 63 6f 6c |ts in random col| 000003e0 6f 75 72 73 2e 0a 0a 41 72 6d 36 20 73 68 6f 77 |ours...Arm6 show| 000003f0 73 20 68 6f 77 20 74 6f 20 64 65 74 65 72 6d 69 |s how to determi| 00000400 6e 65 20 74 68 65 20 73 74 61 74 75 73 20 66 6c |ne the status fl| 00000410 61 67 73 20 6f 6e 20 72 65 74 75 72 6e 69 6e 67 |ags on returning| 00000420 20 66 72 6f 6d 20 61 20 72 6f 75 74 69 6e 65 2e | from a routine.| 00000430 20 57 68 65 6e 20 69 74 20 69 73 20 72 75 6e 2c | When it is run,| 00000440 20 27 5a 27 20 61 6e 64 20 27 43 27 20 61 72 65 | 'Z' and 'C' are| 00000450 20 64 69 73 70 6c 61 79 65 64 2c 20 73 68 6f 77 | displayed, show| 00000460 69 6e 67 20 74 68 61 74 20 74 68 65 20 5a 65 72 |ing that the Zer| 00000470 6f 20 61 6e 64 20 43 61 72 72 79 20 66 6c 61 67 |o and Carry flag| 00000480 73 20 61 72 65 20 73 65 74 20 62 79 20 74 68 65 |s are set by the| 00000490 20 70 72 6f 67 72 61 6d 2e 20 54 6f 20 65 78 70 | program. To exp| 000004a0 65 72 69 6d 65 6e 74 20 77 69 74 68 20 74 68 65 |eriment with the| 000004b0 20 72 65 73 75 6c 74 73 2c 20 61 6c 74 65 72 20 | results, alter | 000004c0 74 68 65 20 6c 69 6e 65 20 73 74 61 72 74 69 6e |the line startin| 000004d0 67 20 77 69 74 68 20 4d 4f 56 53 2e 0a 0a 46 6f |g with MOVS...Fo| 000004e0 72 20 6d 6f 72 65 20 64 65 74 61 69 6c 73 2c 20 |r more details, | 000004f0 73 65 65 20 70 61 67 65 20 31 30 35 20 69 6e 20 |see page 105 in | 00000500 74 68 65 20 6d 61 67 61 7a 69 6e 65 2e 0a 0a a9 |the magazine....| 00000510 20 42 42 43 20 41 63 6f 72 6e 20 55 73 65 72 20 | BBC Acorn User | 00000520 31 39 39 33 0a |1993.| 00000525
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