Home » Archimedes archive » Archimedes World » AW-1993-09.adf » AWSept93 » !AWSept93/Goodies/ThrowBack/Examples/!ReadMe
!AWSept93/Goodies/ThrowBack/Examples/!ReadMe
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 » Archimedes World » AW-1993-09.adf » AWSept93 |
| Filename: | !AWSept93/Goodies/ThrowBack/Examples/!ReadMe |
| Read OK: | ✔ |
| File size: | 03AD bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
1. "SampleProg" is an example of a simple BASIC program
with an error.
Double-click to see what happens.
2. "!SampleApp" illustrates the structure of throwback
when used with an application. Double-click it.
3. The directory "SampleLib" contains
� a procedure library "!SampleLib"
� a program "LibExample" which uses the procedure library.
If the program LibExample is double-clicked there
is an error which occurs in PROCPrint in the library.
Note the use of the psuedo-filing system
SampleLib$Path
which enables us to refer to any file in the
directory Library (inside !SampleLib) as
SampleLib:<file-name>
Try moving the Library application to different locations and
re-setting the value of this system variable by double-
clicking !SampleLib.
Every time you run LibExample the file
(and hence the error) will be found by throwback.
00000000 0a 0a 31 2e 20 22 53 61 6d 70 6c 65 50 72 6f 67 |..1. "SampleProg| 00000010 22 20 69 73 20 61 6e 20 65 78 61 6d 70 6c 65 20 |" is an example | 00000020 6f 66 20 61 20 73 69 6d 70 6c 65 20 42 41 53 49 |of a simple BASI| 00000030 43 20 70 72 6f 67 72 61 6d 0a 20 20 20 77 69 74 |C program. wit| 00000040 68 20 61 6e 20 65 72 72 6f 72 2e 0a 0a 20 20 20 |h an error... | 00000050 44 6f 75 62 6c 65 2d 63 6c 69 63 6b 20 74 6f 20 |Double-click to | 00000060 73 65 65 20 77 68 61 74 20 68 61 70 70 65 6e 73 |see what happens| 00000070 2e 0a 0a 32 2e 20 22 21 53 61 6d 70 6c 65 41 70 |...2. "!SampleAp| 00000080 70 22 20 69 6c 6c 75 73 74 72 61 74 65 73 20 74 |p" illustrates t| 00000090 68 65 20 73 74 72 75 63 74 75 72 65 20 6f 66 20 |he structure of | 000000a0 74 68 72 6f 77 62 61 63 6b 0a 20 20 20 77 68 65 |throwback. whe| 000000b0 6e 20 75 73 65 64 20 77 69 74 68 20 61 6e 20 61 |n used with an a| 000000c0 70 70 6c 69 63 61 74 69 6f 6e 2e 20 44 6f 75 62 |pplication. Doub| 000000d0 6c 65 2d 63 6c 69 63 6b 20 69 74 2e 0a 0a 33 2e |le-click it...3.| 000000e0 20 54 68 65 20 64 69 72 65 63 74 6f 72 79 20 22 | The directory "| 000000f0 53 61 6d 70 6c 65 4c 69 62 22 20 63 6f 6e 74 61 |SampleLib" conta| 00000100 69 6e 73 0a 20 0a 20 20 20 20 20 20 20 20 8f 20 |ins. . . | 00000110 61 20 70 72 6f 63 65 64 75 72 65 20 6c 69 62 72 |a procedure libr| 00000120 61 72 79 20 22 21 53 61 6d 70 6c 65 4c 69 62 22 |ary "!SampleLib"| 00000130 0a 20 20 20 20 20 20 20 20 8f 20 61 20 70 72 6f |. . a pro| 00000140 67 72 61 6d 20 22 4c 69 62 45 78 61 6d 70 6c 65 |gram "LibExample| 00000150 22 20 77 68 69 63 68 20 75 73 65 73 20 74 68 65 |" which uses the| 00000160 20 70 72 6f 63 65 64 75 72 65 20 6c 69 62 72 61 | procedure libra| 00000170 72 79 2e 0a 0a 20 20 20 49 66 20 74 68 65 20 70 |ry... If the p| 00000180 72 6f 67 72 61 6d 20 4c 69 62 45 78 61 6d 70 6c |rogram LibExampl| 00000190 65 20 69 73 20 64 6f 75 62 6c 65 2d 63 6c 69 63 |e is double-clic| 000001a0 6b 65 64 20 74 68 65 72 65 0a 20 20 20 69 73 20 |ked there. is | 000001b0 61 6e 20 65 72 72 6f 72 20 77 68 69 63 68 20 6f |an error which o| 000001c0 63 63 75 72 73 20 69 6e 20 50 52 4f 43 50 72 69 |ccurs in PROCPri| 000001d0 6e 74 20 69 6e 20 74 68 65 20 6c 69 62 72 61 72 |nt in the librar| 000001e0 79 2e 0a 0a 20 20 20 4e 6f 74 65 20 74 68 65 20 |y... Note the | 000001f0 75 73 65 20 6f 66 20 74 68 65 20 70 73 75 65 64 |use of the psued| 00000200 6f 2d 66 69 6c 69 6e 67 20 73 79 73 74 65 6d 0a |o-filing system.| 00000210 0a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 53 |. S| 00000220 61 6d 70 6c 65 4c 69 62 24 50 61 74 68 0a 0a 20 |ampleLib$Path.. | 00000230 20 20 77 68 69 63 68 20 65 6e 61 62 6c 65 73 20 | which enables | 00000240 75 73 20 74 6f 20 72 65 66 65 72 20 74 6f 20 61 |us to refer to a| 00000250 6e 79 20 66 69 6c 65 20 69 6e 20 74 68 65 0a 20 |ny file in the. | 00000260 20 20 64 69 72 65 63 74 6f 72 79 20 4c 69 62 72 | directory Libr| 00000270 61 72 79 20 28 69 6e 73 69 64 65 20 21 53 61 6d |ary (inside !Sam| 00000280 70 6c 65 4c 69 62 29 20 61 73 0a 0a 20 20 20 20 |pleLib) as.. | 00000290 20 20 20 20 20 20 20 20 20 53 61 6d 70 6c 65 4c | SampleL| 000002a0 69 62 3a 3c 66 69 6c 65 2d 6e 61 6d 65 3e 0a 0a |ib:<file-name>..| 000002b0 20 20 20 54 72 79 20 6d 6f 76 69 6e 67 20 74 68 | Try moving th| 000002c0 65 20 4c 69 62 72 61 72 79 20 61 70 70 6c 69 63 |e Library applic| 000002d0 61 74 69 6f 6e 20 74 6f 20 64 69 66 66 65 72 65 |ation to differe| 000002e0 6e 74 20 6c 6f 63 61 74 69 6f 6e 73 20 61 6e 64 |nt locations and| 000002f0 20 0a 20 20 20 72 65 2d 73 65 74 74 69 6e 67 20 | . re-setting | 00000300 74 68 65 20 76 61 6c 75 65 20 6f 66 20 74 68 69 |the value of thi| 00000310 73 20 73 79 73 74 65 6d 20 76 61 72 69 61 62 6c |s system variabl| 00000320 65 20 62 79 20 64 6f 75 62 6c 65 2d 0a 20 20 20 |e by double-. | 00000330 63 6c 69 63 6b 69 6e 67 20 21 53 61 6d 70 6c 65 |clicking !Sample| 00000340 4c 69 62 2e 20 0a 0a 20 20 20 45 76 65 72 79 20 |Lib. .. Every | 00000350 74 69 6d 65 20 79 6f 75 20 72 75 6e 20 4c 69 62 |time you run Lib| 00000360 45 78 61 6d 70 6c 65 20 74 68 65 20 66 69 6c 65 |Example the file| 00000370 20 0a 20 20 20 28 61 6e 64 20 68 65 6e 63 65 20 | . (and hence | 00000380 74 68 65 20 65 72 72 6f 72 29 20 77 69 6c 6c 20 |the error) will | 00000390 62 65 20 66 6f 75 6e 64 20 62 79 20 74 68 72 6f |be found by thro| 000003a0 77 62 61 63 6b 2e 0a 0a 0a 20 20 20 0a |wback.... .| 000003ad
.