Home » Personal collection » Acorn ADFS disks » Electron_User_Group » EUG_33.ADF » P/+SOLU1
P/+SOLU1
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 ADFS disks » Electron_User_Group » EUG_33.ADF |
| Filename: | P/+SOLU1 |
| Read OK: | ✔ |
| File size: | 099B bytes |
| Load address: | 53206576 |
| Exec address: | 31756C6F |
File contents
MEMORY SCRUB
Sometimes when you're developing a program it is useful to be able to wipe
an area of memory to be sure that old data is not affecting the way the
program is running.
This short line will put a 0 into every memory location set by the FOR
NEXT loop.
*KEY0 FOR A=&E00TO&4000:?A=0:NEXT|M
The number &E00 is page on the Master so for the Elk this might be &1D00.
On the Beeb &1900. The number &4000 is the beginning of the screen memory.
?A=0 is BBC BASIC's way of saying poke 0 into location A and since A
starts at &E00 and cycles up to &4000 every location will have 0 poked
into it. |M is simply RETURN and will cause the routine to run as soon as
function key 0 is pressed
Almost any addresses can be used and the screen could be wiped in this
way. Some addresses will cause the computer to lock up but this will not
do the computer any harm at all. And if you happen to wipe area &B00 to
&B38 the routine itself will be wiped and the computer will lockup.
CHANGING DRIVES IN ADFS
Some people bourght up on DFS are put off ADFS by the number of key
presses needed to change drives and directories.
You have a disc in drive 0, $ directory, subdirectory A then in A there is
a further subdirectory B
Disc in drive 1 $ directory, subdirectory C and in C there is a further
subdirectory D.
You are working on a file FRED in directory B and you want to move it to
directory D.
Type *DIR :1.C.D <RET>
You always need a colon before a drive number and a period before a
directory name. Apart from that it is really easy.
A lot easier than the manual's instructions: *MOUNT1 <RET>
*DIR C <RET>
*DIR D <RET>
This routine can also make changing discs easier.
If you have a single drive, you are working on a file in directory B as
before and you want to save it onto a different disc in directory D, put
the new disc into the drive and type *DIR :0.C.D <RET>
PRINTING TEXT FILES
This routine has been in EUG before but is worth repeating. It was sent in
around EUG16 by someone and I am sorry to say I have forgotten who.
10 *LOAD TEXT 2000
20 VDU14: PRINT"Press SHIFT to scrol"
30 FOR B%=&2000 TO &3F00
40 A%=?B%
50 CALL &FFE3
60 NEXT
Ideally the length of the text file should be added to &2000 and this
figure put in in place of &3F00. If you type *EX <RET> the length is the
third secquence of numbers.
Type P.~ &2000 + &length <RET>
00000000 4d 45 4d 4f 52 59 20 53 43 52 55 42 0d 0d 53 6f |MEMORY SCRUB..So| 00000010 6d 65 74 69 6d 65 73 20 77 68 65 6e 20 79 6f 75 |metimes when you| 00000020 27 72 65 20 64 65 76 65 6c 6f 70 69 6e 67 20 61 |'re developing a| 00000030 20 70 72 6f 67 72 61 6d 20 69 74 20 69 73 20 75 | program it is u| 00000040 73 65 66 75 6c 20 74 6f 20 62 65 20 61 62 6c 65 |seful to be able| 00000050 20 74 6f 20 77 69 70 65 0d 61 6e 20 61 72 65 61 | to wipe.an area| 00000060 20 6f 66 20 6d 65 6d 6f 72 79 20 74 6f 20 62 65 | of memory to be| 00000070 20 73 75 72 65 20 74 68 61 74 20 6f 6c 64 20 64 | sure that old d| 00000080 61 74 61 20 69 73 20 6e 6f 74 20 61 66 66 65 63 |ata is not affec| 00000090 74 69 6e 67 20 74 68 65 20 77 61 79 20 74 68 65 |ting the way the| 000000a0 0d 70 72 6f 67 72 61 6d 20 69 73 20 72 75 6e 6e |.program is runn| 000000b0 69 6e 67 2e 20 0d 0d 54 68 69 73 20 73 68 6f 72 |ing. ..This shor| 000000c0 74 20 6c 69 6e 65 20 77 69 6c 6c 20 70 75 74 20 |t line will put | 000000d0 61 20 30 20 69 6e 74 6f 20 65 76 65 72 79 20 6d |a 0 into every m| 000000e0 65 6d 6f 72 79 20 6c 6f 63 61 74 69 6f 6e 20 73 |emory location s| 000000f0 65 74 20 62 79 20 74 68 65 20 46 4f 52 0d 4e 45 |et by the FOR.NE| 00000100 58 54 20 6c 6f 6f 70 2e 20 0d 0d 2a 4b 45 59 30 |XT loop. ..*KEY0| 00000110 20 46 4f 52 20 41 3d 26 45 30 30 54 4f 26 34 30 | FOR A=&E00TO&40| 00000120 30 30 3a 3f 41 3d 30 3a 4e 45 58 54 7c 4d 0d 0d |00:?A=0:NEXT|M..| 00000130 54 68 65 20 6e 75 6d 62 65 72 20 26 45 30 30 20 |The number &E00 | 00000140 69 73 20 70 61 67 65 20 6f 6e 20 74 68 65 20 4d |is page on the M| 00000150 61 73 74 65 72 20 73 6f 20 66 6f 72 20 74 68 65 |aster so for the| 00000160 20 45 6c 6b 20 74 68 69 73 20 6d 69 67 68 74 20 | Elk this might | 00000170 62 65 20 26 31 44 30 30 2e 0d 4f 6e 20 74 68 65 |be &1D00..On the| 00000180 20 42 65 65 62 20 26 31 39 30 30 2e 20 54 68 65 | Beeb &1900. The| 00000190 20 6e 75 6d 62 65 72 20 26 34 30 30 30 20 69 73 | number &4000 is| 000001a0 20 74 68 65 20 62 65 67 69 6e 6e 69 6e 67 20 6f | the beginning o| 000001b0 66 20 74 68 65 20 73 63 72 65 65 6e 20 6d 65 6d |f the screen mem| 000001c0 6f 72 79 2e 0d 3f 41 3d 30 20 69 73 20 42 42 43 |ory..?A=0 is BBC| 000001d0 20 42 41 53 49 43 27 73 20 77 61 79 20 6f 66 20 | BASIC's way of | 000001e0 73 61 79 69 6e 67 20 70 6f 6b 65 20 30 20 69 6e |saying poke 0 in| 000001f0 74 6f 20 6c 6f 63 61 74 69 6f 6e 20 41 20 61 6e |to location A an| 00000200 64 20 73 69 6e 63 65 20 41 0d 73 74 61 72 74 73 |d since A.starts| 00000210 20 61 74 20 26 45 30 30 20 61 6e 64 20 63 79 63 | at &E00 and cyc| 00000220 6c 65 73 20 75 70 20 74 6f 20 26 34 30 30 30 20 |les up to &4000 | 00000230 65 76 65 72 79 20 6c 6f 63 61 74 69 6f 6e 20 77 |every location w| 00000240 69 6c 6c 20 68 61 76 65 20 30 20 70 6f 6b 65 64 |ill have 0 poked| 00000250 0d 69 6e 74 6f 20 69 74 2e 20 7c 4d 20 69 73 20 |.into it. |M is | 00000260 73 69 6d 70 6c 79 20 52 45 54 55 52 4e 20 61 6e |simply RETURN an| 00000270 64 20 77 69 6c 6c 20 63 61 75 73 65 20 74 68 65 |d will cause the| 00000280 20 72 6f 75 74 69 6e 65 20 74 6f 20 72 75 6e 20 | routine to run | 00000290 61 73 20 73 6f 6f 6e 20 61 73 0d 66 75 6e 63 74 |as soon as.funct| 000002a0 69 6f 6e 20 6b 65 79 20 30 20 69 73 20 70 72 65 |ion key 0 is pre| 000002b0 73 73 65 64 0d 0d 41 6c 6d 6f 73 74 20 61 6e 79 |ssed..Almost any| 000002c0 20 61 64 64 72 65 73 73 65 73 20 63 61 6e 20 62 | addresses can b| 000002d0 65 20 75 73 65 64 20 61 6e 64 20 74 68 65 20 73 |e used and the s| 000002e0 63 72 65 65 6e 20 63 6f 75 6c 64 20 62 65 20 77 |creen could be w| 000002f0 69 70 65 64 20 69 6e 20 74 68 69 73 0d 77 61 79 |iped in this.way| 00000300 2e 20 53 6f 6d 65 20 61 64 64 72 65 73 73 65 73 |. Some addresses| 00000310 20 77 69 6c 6c 20 63 61 75 73 65 20 74 68 65 20 | will cause the | 00000320 63 6f 6d 70 75 74 65 72 20 74 6f 20 6c 6f 63 6b |computer to lock| 00000330 20 75 70 20 62 75 74 20 74 68 69 73 20 77 69 6c | up but this wil| 00000340 6c 20 6e 6f 74 0d 64 6f 20 74 68 65 20 63 6f 6d |l not.do the com| 00000350 70 75 74 65 72 20 61 6e 79 20 68 61 72 6d 20 61 |puter any harm a| 00000360 74 20 61 6c 6c 2e 20 41 6e 64 20 69 66 20 79 6f |t all. And if yo| 00000370 75 20 68 61 70 70 65 6e 20 74 6f 20 77 69 70 65 |u happen to wipe| 00000380 20 61 72 65 61 20 26 42 30 30 20 74 6f 0d 26 42 | area &B00 to.&B| 00000390 33 38 20 74 68 65 20 72 6f 75 74 69 6e 65 20 69 |38 the routine i| 000003a0 74 73 65 6c 66 20 77 69 6c 6c 20 62 65 20 77 69 |tself will be wi| 000003b0 70 65 64 20 61 6e 64 20 74 68 65 20 63 6f 6d 70 |ped and the comp| 000003c0 75 74 65 72 20 77 69 6c 6c 20 6c 6f 63 6b 75 70 |uter will lockup| 000003d0 2e 20 0d 0d 43 48 41 4e 47 49 4e 47 20 44 52 49 |. ..CHANGING DRI| 000003e0 56 45 53 20 49 4e 20 41 44 46 53 0d 0d 53 6f 6d |VES IN ADFS..Som| 000003f0 65 20 70 65 6f 70 6c 65 20 62 6f 75 72 67 68 74 |e people bourght| 00000400 20 75 70 20 6f 6e 20 44 46 53 20 61 72 65 20 70 | up on DFS are p| 00000410 75 74 20 6f 66 66 20 41 44 46 53 20 62 79 20 74 |ut off ADFS by t| 00000420 68 65 20 6e 75 6d 62 65 72 20 6f 66 20 6b 65 79 |he number of key| 00000430 0d 70 72 65 73 73 65 73 20 6e 65 65 64 65 64 20 |.presses needed | 00000440 74 6f 20 63 68 61 6e 67 65 20 64 72 69 76 65 73 |to change drives| 00000450 20 61 6e 64 20 64 69 72 65 63 74 6f 72 69 65 73 | and directories| 00000460 2e 0d 0d 59 6f 75 20 68 61 76 65 20 61 20 64 69 |...You have a di| 00000470 73 63 20 69 6e 20 64 72 69 76 65 20 30 2c 20 24 |sc in drive 0, $| 00000480 20 64 69 72 65 63 74 6f 72 79 2c 20 73 75 62 64 | directory, subd| 00000490 69 72 65 63 74 6f 72 79 20 41 20 74 68 65 6e 20 |irectory A then | 000004a0 69 6e 20 41 20 74 68 65 72 65 20 69 73 0d 61 20 |in A there is.a | 000004b0 66 75 72 74 68 65 72 20 73 75 62 64 69 72 65 63 |further subdirec| 000004c0 74 6f 72 79 20 42 0d 0d 44 69 73 63 20 69 6e 20 |tory B..Disc in | 000004d0 64 72 69 76 65 20 31 20 24 20 64 69 72 65 63 74 |drive 1 $ direct| 000004e0 6f 72 79 2c 20 73 75 62 64 69 72 65 63 74 6f 72 |ory, subdirector| 000004f0 79 20 43 20 61 6e 64 20 69 6e 20 43 20 74 68 65 |y C and in C the| 00000500 72 65 20 69 73 20 61 20 66 75 72 74 68 65 72 0d |re is a further.| 00000510 73 75 62 64 69 72 65 63 74 6f 72 79 20 44 2e 0d |subdirectory D..| 00000520 0d 59 6f 75 20 61 72 65 20 77 6f 72 6b 69 6e 67 |.You are working| 00000530 20 6f 6e 20 61 20 66 69 6c 65 20 46 52 45 44 20 | on a file FRED | 00000540 69 6e 20 64 69 72 65 63 74 6f 72 79 20 42 20 61 |in directory B a| 00000550 6e 64 20 79 6f 75 20 77 61 6e 74 20 74 6f 20 6d |nd you want to m| 00000560 6f 76 65 20 69 74 20 74 6f 0d 64 69 72 65 63 74 |ove it to.direct| 00000570 6f 72 79 20 44 2e 0d 0d 54 79 70 65 20 2a 44 49 |ory D...Type *DI| 00000580 52 20 3a 31 2e 43 2e 44 20 3c 52 45 54 3e 0d 0d |R :1.C.D <RET>..| 00000590 59 6f 75 20 61 6c 77 61 79 73 20 6e 65 65 64 20 |You always need | 000005a0 61 20 63 6f 6c 6f 6e 20 62 65 66 6f 72 65 20 61 |a colon before a| 000005b0 20 64 72 69 76 65 20 6e 75 6d 62 65 72 20 61 6e | drive number an| 000005c0 64 20 61 20 70 65 72 69 6f 64 20 62 65 66 6f 72 |d a period befor| 000005d0 65 20 61 0d 64 69 72 65 63 74 6f 72 79 20 6e 61 |e a.directory na| 000005e0 6d 65 2e 20 41 70 61 72 74 20 66 72 6f 6d 20 74 |me. Apart from t| 000005f0 68 61 74 20 69 74 20 69 73 20 72 65 61 6c 6c 79 |hat it is really| 00000600 20 65 61 73 79 2e 0d 0d 41 20 6c 6f 74 20 65 61 | easy...A lot ea| 00000610 73 69 65 72 20 74 68 61 6e 20 74 68 65 20 6d 61 |sier than the ma| 00000620 6e 75 61 6c 27 73 20 69 6e 73 74 72 75 63 74 69 |nual's instructi| 00000630 6f 6e 73 3a 20 2a 4d 4f 55 4e 54 31 20 3c 52 45 |ons: *MOUNT1 <RE| 00000640 54 3e 20 0d 20 20 20 20 20 20 20 20 20 20 20 20 |T> . | 00000650 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | * 00000670 20 2a 44 49 52 20 43 20 20 3c 52 45 54 3e 0d 20 | *DIR C <RET>. | 00000680 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | * 000006a0 20 20 20 20 20 20 20 20 20 20 20 20 2a 44 49 52 | *DIR| 000006b0 20 44 20 20 3c 52 45 54 3e 0d 0d 54 68 69 73 20 | D <RET>..This | 000006c0 72 6f 75 74 69 6e 65 20 63 61 6e 20 61 6c 73 6f |routine can also| 000006d0 20 6d 61 6b 65 20 63 68 61 6e 67 69 6e 67 20 64 | make changing d| 000006e0 69 73 63 73 20 65 61 73 69 65 72 2e 0d 0d 49 66 |iscs easier...If| 000006f0 20 79 6f 75 20 68 61 76 65 20 61 20 73 69 6e 67 | you have a sing| 00000700 6c 65 20 64 72 69 76 65 2c 20 79 6f 75 20 61 72 |le drive, you ar| 00000710 65 20 77 6f 72 6b 69 6e 67 20 6f 6e 20 61 20 66 |e working on a f| 00000720 69 6c 65 20 69 6e 20 64 69 72 65 63 74 6f 72 79 |ile in directory| 00000730 20 42 20 61 73 0d 62 65 66 6f 72 65 20 61 6e 64 | B as.before and| 00000740 20 79 6f 75 20 77 61 6e 74 20 74 6f 20 73 61 76 | you want to sav| 00000750 65 20 69 74 20 6f 6e 74 6f 20 61 20 64 69 66 66 |e it onto a diff| 00000760 65 72 65 6e 74 20 64 69 73 63 20 69 6e 20 64 69 |erent disc in di| 00000770 72 65 63 74 6f 72 79 20 44 2c 20 70 75 74 0d 74 |rectory D, put.t| 00000780 68 65 20 6e 65 77 20 64 69 73 63 20 69 6e 74 6f |he new disc into| 00000790 20 74 68 65 20 64 72 69 76 65 20 61 6e 64 20 74 | the drive and t| 000007a0 79 70 65 20 2a 44 49 52 20 3a 30 2e 43 2e 44 20 |ype *DIR :0.C.D | 000007b0 3c 52 45 54 3e 0d 0d 50 52 49 4e 54 49 4e 47 20 |<RET>..PRINTING | 000007c0 54 45 58 54 20 46 49 4c 45 53 0d 0d 54 68 69 73 |TEXT FILES..This| 000007d0 20 72 6f 75 74 69 6e 65 20 68 61 73 20 62 65 65 | routine has bee| 000007e0 6e 20 69 6e 20 45 55 47 20 62 65 66 6f 72 65 20 |n in EUG before | 000007f0 62 75 74 20 69 73 20 77 6f 72 74 68 20 72 65 70 |but is worth rep| 00000800 65 61 74 69 6e 67 2e 20 49 74 20 77 61 73 20 73 |eating. It was s| 00000810 65 6e 74 20 69 6e 0d 61 72 6f 75 6e 64 20 45 55 |ent in.around EU| 00000820 47 31 36 20 62 79 20 73 6f 6d 65 6f 6e 65 20 61 |G16 by someone a| 00000830 6e 64 20 49 20 61 6d 20 73 6f 72 72 79 20 74 6f |nd I am sorry to| 00000840 20 73 61 79 20 49 20 68 61 76 65 20 66 6f 72 67 | say I have forg| 00000850 6f 74 74 65 6e 20 77 68 6f 2e 0d 0d 31 30 20 2a |otten who...10 *| 00000860 4c 4f 41 44 20 54 45 58 54 20 32 30 30 30 0d 32 |LOAD TEXT 2000.2| 00000870 30 20 56 44 55 31 34 3a 20 50 52 49 4e 54 22 50 |0 VDU14: PRINT"P| 00000880 72 65 73 73 20 53 48 49 46 54 20 74 6f 20 73 63 |ress SHIFT to sc| 00000890 72 6f 6c 22 0d 33 30 20 46 4f 52 20 42 25 3d 26 |rol".30 FOR B%=&| 000008a0 32 30 30 30 20 54 4f 20 26 33 46 30 30 0d 34 30 |2000 TO &3F00.40| 000008b0 20 41 25 3d 3f 42 25 0d 35 30 20 43 41 4c 4c 20 | A%=?B%.50 CALL | 000008c0 26 46 46 45 33 0d 36 30 20 4e 45 58 54 0d 0d 49 |&FFE3.60 NEXT..I| 000008d0 64 65 61 6c 6c 79 20 74 68 65 20 6c 65 6e 67 74 |deally the lengt| 000008e0 68 20 6f 66 20 74 68 65 20 74 65 78 74 20 66 69 |h of the text fi| 000008f0 6c 65 20 73 68 6f 75 6c 64 20 62 65 20 61 64 64 |le should be add| 00000900 65 64 20 74 6f 20 26 32 30 30 30 20 61 6e 64 20 |ed to &2000 and | 00000910 74 68 69 73 0d 66 69 67 75 72 65 20 70 75 74 20 |this.figure put | 00000920 69 6e 20 69 6e 20 70 6c 61 63 65 20 6f 66 20 26 |in in place of &| 00000930 33 46 30 30 2e 20 49 66 20 79 6f 75 20 74 79 70 |3F00. If you typ| 00000940 65 20 2a 45 58 20 3c 52 45 54 3e 20 74 68 65 20 |e *EX <RET> the | 00000950 6c 65 6e 67 74 68 20 69 73 20 74 68 65 0d 74 68 |length is the.th| 00000960 69 72 64 20 73 65 63 71 75 65 6e 63 65 20 6f 66 |ird secquence of| 00000970 20 6e 75 6d 62 65 72 73 2e 0d 0d 54 79 70 65 20 | numbers...Type | 00000980 50 2e 7e 20 26 32 30 30 30 20 2b 20 26 6c 65 6e |P.~ &2000 + &len| 00000990 67 74 68 20 3c 52 45 54 3e 0d 0d |gth <RET>..| 0000099b
P/+SOLU1.m0
P/+SOLU1.m1
P/+SOLU1.m2
P/+SOLU1.m4
P/+SOLU1.m5
.