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L/+SPROW1
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_27.ADF |
| Filename: | L/+SPROW1 |
| Read OK: | ✔ |
| File size: | 100F bytes |
| Load address: | 2B224556 |
| Exec address: | 4F525053 |
File contents
6 Bollinbrook road,
MACCLESFIELD,
Cheshire.
SK10 3DJ.
Dear All,
The idea of using the second catalogue is excellent,sitting here
with a dual sided 80 track drive I was tired of 'flippy'ing it over all
the time.
However,with Acorn's DFS 1.20 there appears to be a bug.There is a
persistent 'Not found' error whenever the second catalogue has been
copied into tracks 0 and 1.
I tried modifying the menu programs by adding a *DISC command to
restart the DFS and the following that by a VDU21,*CAT,VDU6 to copy the
disk's catalogue into ram.
This didn't work either,as the printer was turned on,which,as I
hadn't got a printer connected locked up the machine.
Using the printer sink (*FX5,0) didn't help much,and it would appear
that the following fixes it:
You must wait for the drive to come to a stand still.ie.typing *RUN
CAT2 then (while the drive is whirring) using the type ahead facility to
do a *CAT resulted in the bug appearing and the catalogue had not
changed.But typing *RUN CAT2 then waiting for the drive to stop followed
by a *CAT was ok.
To fix this,load the MENU (or PMENU or SMENU or GMENU) into RAM and
add the line
451TIME=0:REPEAT:UNTILTIME>300
and save it.This gives a 3 second software delay for my drive to
stop.The value may need to be altered depending on what drive speed
settings you have.
R.P.Sprowson.
YOUR MODIFICATIONS TO RICHARD'S PROGRAMS HAVE NEVER FAILED YET SO THIS ONE
WILL BE ADDED.
FOR THE ADFS MEMBERS, AS YOU KNOW THE DFS CATALOGUE CAN ONLY HOLD 30 OR SO
FILES. TO GET OVER THIS I HAVE BEEN USING FLIPPYS WHERE 5.25" DISCS WERE
PHYSICALLY TURNED OVER TO ACCESS THE SECOND SIDE. NOW THANKS OF COURSE TO
RICHARD DIMOND, WHO ELSE, WE HAVE A DUAL CATALOGUE FACILITY FOR EUG DFS.
AS IT HAPPENS WE ALSO HAVE ANOTHER PROGRAM WHICH IS STILL BEING EVALUATED
WHICH WILL PUT MULTIPUL CATALOGUES, UP TO 90 I THINK ON A SINGLE DISC.
***********************************************************************
6 Bollinbrook road,
MACCLESFIELD,
Cheshire.
SK10 3DJ.
Dear Alan Richardson,
The only company
that I can think of to help you with
flyback transformers is "Grandata"
here in the UK.
I couldn't see an exact equivalent,
but maybe a nice letter from NZ would
prompt them:
Grandata Limited,
KP House,Unit 15,
Pop in Commercial centre,
Southway,
WEMBLEY.Middlesex.
HA9 0HB.
Tele: 0181 900 2329
Fax: 0181 903 6126
You may want to mention P192 of their
catalogue.
R.P.Sprowson.
***********************************************************************
6 Bollinbrook road,
MACCLESFIELD,
Cheshire.
SK10 3DJ.
Dear Mark Bellis,
You were wondering about how Citadel/Thrust screen
scrolling worked,and,judging by your other comments in your letter you
know what you're doing.
If getting the loader program to EOR the file and then disassembling
this to find out how the screen works is too hard,let IT do the work for
you.
Write a rom which traps the 'BRK occured' service call (number 6)
then,having detected that,issue a *TAPE (ie.*FX140,baud) and *SAVE the
whole of the BBC's memory to tape.
Tape is obviously used as it does not gobble the 2.75k that DFS
does,and also most games relocate themselves over the language and NMI
workspace from &DFF and below (in the BBC).
Now all you need to do is cause an error - Escape usually works - but
this may have been turned off to allow it to be used instead to toggle
between the scoreboard and the game.If this is the case then trap service
call 5 (IRQ not recognised) instead ,and short pin 7 to pin 8 on the 1MHz
bus.
Hope this has been of some help,look forward to seeing the games
you're producing.
R.P.Sprowson.
00000000 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000010 20 20 20 36 20 42 6f 6c 6c 69 6e 62 72 6f 6f 6b | 6 Bollinbrook| 00000020 20 72 6f 61 64 2c 20 0d 20 20 20 20 20 20 20 20 | road, . | 00000030 20 20 20 20 20 20 20 20 20 20 20 20 4d 41 43 43 | MACC| 00000040 4c 45 53 46 49 45 4c 44 2c 20 0d 20 20 20 20 20 |LESFIELD, . | 00000050 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000060 43 68 65 73 68 69 72 65 2e 20 0d 20 20 20 20 20 |Cheshire. . | 00000070 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00000080 20 53 4b 31 30 20 33 44 4a 2e 20 0d 20 0d 44 65 | SK10 3DJ. . .De| 00000090 61 72 20 41 6c 6c 2c 20 0d 20 20 20 20 20 20 20 |ar All, . | 000000a0 20 20 54 68 65 20 69 64 65 61 20 6f 66 20 75 73 | The idea of us| 000000b0 69 6e 67 20 74 68 65 20 73 65 63 6f 6e 64 20 20 |ing the second | 000000c0 63 61 74 61 6c 6f 67 75 65 20 69 73 20 65 78 63 |catalogue is exc| 000000d0 65 6c 6c 65 6e 74 2c 73 69 74 74 69 6e 67 20 68 |ellent,sitting h| 000000e0 65 72 65 20 0d 77 69 74 68 20 61 20 64 75 61 6c |ere .with a dual| 000000f0 20 73 69 64 65 64 20 38 30 20 74 72 61 63 6b 20 | sided 80 track | 00000100 64 72 69 76 65 20 49 20 77 61 73 20 20 74 69 72 |drive I was tir| 00000110 65 64 20 6f 66 20 27 66 6c 69 70 70 79 27 69 6e |ed of 'flippy'in| 00000120 67 20 69 74 20 6f 76 65 72 20 61 6c 6c 0d 74 68 |g it over all.th| 00000130 65 20 20 74 69 6d 65 2e 20 0d 0d 20 20 20 48 6f |e time. .. Ho| 00000140 77 65 76 65 72 2c 77 69 74 68 20 41 63 6f 72 6e |wever,with Acorn| 00000150 27 73 20 44 46 53 20 31 2e 32 30 20 74 68 65 72 |'s DFS 1.20 ther| 00000160 65 20 20 61 70 70 65 61 72 73 20 74 6f 20 62 65 |e appears to be| 00000170 20 61 20 62 75 67 2e 54 68 65 72 65 20 69 73 20 | a bug.There is | 00000180 61 20 0d 70 65 72 73 69 73 74 65 6e 74 20 27 4e |a .persistent 'N| 00000190 6f 74 20 66 6f 75 6e 64 27 20 65 72 72 6f 72 20 |ot found' error | 000001a0 77 68 65 6e 65 76 65 72 20 20 74 68 65 20 73 65 |whenever the se| 000001b0 63 6f 6e 64 20 63 61 74 61 6c 6f 67 75 65 20 68 |cond catalogue h| 000001c0 61 73 20 62 65 65 6e 0d 63 6f 70 69 65 64 20 20 |as been.copied | 000001d0 69 6e 74 6f 20 74 72 61 63 6b 73 20 30 20 61 6e |into tracks 0 an| 000001e0 64 20 31 2e 20 0d 0d 20 20 20 49 20 74 72 69 65 |d 1. .. I trie| 000001f0 64 20 6d 6f 64 69 66 79 69 6e 67 20 74 68 65 20 |d modifying the | 00000200 6d 65 6e 75 20 70 72 6f 67 72 61 6d 73 20 20 62 |menu programs b| 00000210 79 20 61 64 64 69 6e 67 20 61 20 2a 44 49 53 43 |y adding a *DISC| 00000220 20 63 6f 6d 6d 61 6e 64 20 74 6f 0d 72 65 73 74 | command to.rest| 00000230 61 72 74 20 20 74 68 65 20 44 46 53 20 61 6e 64 |art the DFS and| 00000240 20 74 68 65 20 66 6f 6c 6c 6f 77 69 6e 67 20 74 | the following t| 00000250 68 61 74 20 62 79 20 61 20 20 56 44 55 32 31 2c |hat by a VDU21,| 00000260 2a 43 41 54 2c 56 44 55 36 20 74 6f 20 63 6f 70 |*CAT,VDU6 to cop| 00000270 79 20 74 68 65 0d 64 69 73 6b 27 73 20 20 63 61 |y the.disk's ca| 00000280 74 61 6c 6f 67 75 65 20 69 6e 74 6f 20 72 61 6d |talogue into ram| 00000290 2e 20 0d 0d 20 20 20 54 68 69 73 20 64 69 64 6e |. .. This didn| 000002a0 27 74 20 77 6f 72 6b 20 65 69 74 68 65 72 2c 61 |'t work either,a| 000002b0 73 20 74 68 65 20 20 70 72 69 6e 74 65 72 20 77 |s the printer w| 000002c0 61 73 20 74 75 72 6e 65 64 20 6f 6e 2c 77 68 69 |as turned on,whi| 000002d0 63 68 2c 61 73 20 49 20 0d 68 61 64 6e 27 74 20 |ch,as I .hadn't | 000002e0 67 6f 74 20 61 20 70 72 69 6e 74 65 72 20 63 6f |got a printer co| 000002f0 6e 6e 65 63 74 65 64 20 6c 6f 63 6b 65 64 20 20 |nnected locked | 00000300 75 70 20 74 68 65 20 6d 61 63 68 69 6e 65 2e 20 |up the machine. | 00000310 0d 0d 20 20 20 55 73 69 6e 67 20 74 68 65 20 70 |.. Using the p| 00000320 72 69 6e 74 65 72 20 73 69 6e 6b 20 28 2a 46 58 |rinter sink (*FX| 00000330 35 2c 30 29 20 20 64 69 64 6e 27 74 20 68 65 6c |5,0) didn't hel| 00000340 70 20 6d 75 63 68 2c 61 6e 64 20 69 74 20 77 6f |p much,and it wo| 00000350 75 6c 64 20 61 70 70 65 61 72 20 0d 74 68 61 74 |uld appear .that| 00000360 20 74 68 65 20 66 6f 6c 6c 6f 77 69 6e 67 20 66 | the following f| 00000370 69 78 65 73 20 69 74 3a 20 0d 0d 20 20 20 59 6f |ixes it: .. Yo| 00000380 75 20 6d 75 73 74 20 77 61 69 74 20 66 6f 72 20 |u must wait for | 00000390 74 68 65 20 64 72 69 76 65 20 74 6f 20 63 6f 6d |the drive to com| 000003a0 65 20 20 74 6f 20 61 20 73 74 61 6e 64 20 73 74 |e to a stand st| 000003b0 69 6c 6c 2e 69 65 2e 74 79 70 69 6e 67 20 2a 52 |ill.ie.typing *R| 000003c0 55 4e 0d 43 41 54 32 20 20 74 68 65 6e 20 28 77 |UN.CAT2 then (w| 000003d0 68 69 6c 65 20 74 68 65 20 64 72 69 76 65 20 69 |hile the drive i| 000003e0 73 20 77 68 69 72 72 69 6e 67 29 20 20 75 73 69 |s whirring) usi| 000003f0 6e 67 20 74 68 65 20 74 79 70 65 20 61 68 65 61 |ng the type ahea| 00000400 64 20 66 61 63 69 6c 69 74 79 20 74 6f 0d 64 6f |d facility to.do| 00000410 20 61 20 20 2a 43 41 54 20 72 65 73 75 6c 74 65 | a *CAT resulte| 00000420 64 20 69 6e 20 74 68 65 20 62 75 67 20 61 70 70 |d in the bug app| 00000430 65 61 72 69 6e 67 20 61 6e 64 20 20 74 68 65 20 |earing and the | 00000440 63 61 74 61 6c 6f 67 75 65 20 68 61 64 20 6e 6f |catalogue had no| 00000450 74 0d 63 68 61 6e 67 65 64 2e 42 75 74 20 20 74 |t.changed.But t| 00000460 79 70 69 6e 67 20 2a 52 55 4e 20 43 41 54 32 20 |yping *RUN CAT2 | 00000470 74 68 65 6e 20 77 61 69 74 69 6e 67 20 66 6f 72 |then waiting for| 00000480 20 74 68 65 20 20 64 72 69 76 65 20 74 6f 20 73 | the drive to s| 00000490 74 6f 70 20 66 6f 6c 6c 6f 77 65 64 0d 62 79 20 |top followed.by | 000004a0 61 20 2a 43 41 54 20 77 61 73 20 20 6f 6b 2e 20 |a *CAT was ok. | 000004b0 0d 0d 20 20 20 54 6f 20 66 69 78 20 74 68 69 73 |.. To fix this| 000004c0 2c 6c 6f 61 64 20 74 68 65 20 4d 45 4e 55 20 28 |,load the MENU (| 000004d0 6f 72 20 50 4d 45 4e 55 20 20 6f 72 20 53 4d 45 |or PMENU or SME| 000004e0 4e 55 20 6f 72 20 47 4d 45 4e 55 29 20 69 6e 74 |NU or GMENU) int| 000004f0 6f 20 52 41 4d 20 61 6e 64 0d 61 64 64 20 20 74 |o RAM and.add t| 00000500 68 65 20 6c 69 6e 65 20 0d 20 0d 34 35 31 54 49 |he line . .451TI| 00000510 4d 45 3d 30 3a 52 45 50 45 41 54 3a 55 4e 54 49 |ME=0:REPEAT:UNTI| 00000520 4c 54 49 4d 45 3e 33 30 30 20 0d 20 0d 61 6e 64 |LTIME>300 . .and| 00000530 20 73 61 76 65 20 69 74 2e 54 68 69 73 20 67 69 | save it.This gi| 00000540 76 65 73 20 61 20 33 20 73 65 63 6f 6e 64 20 20 |ves a 3 second | 00000550 73 6f 66 74 77 61 72 65 20 64 65 6c 61 79 20 66 |software delay f| 00000560 6f 72 20 6d 79 20 64 72 69 76 65 20 74 6f 20 0d |or my drive to .| 00000570 73 74 6f 70 2e 54 68 65 20 76 61 6c 75 65 20 6d |stop.The value m| 00000580 61 79 20 6e 65 65 64 20 74 6f 20 62 65 20 61 6c |ay need to be al| 00000590 74 65 72 65 64 20 20 64 65 70 65 6e 64 69 6e 67 |tered depending| 000005a0 20 6f 6e 20 77 68 61 74 20 64 72 69 76 65 20 73 | on what drive s| 000005b0 70 65 65 64 0d 73 65 74 74 69 6e 67 73 20 20 79 |peed.settings y| 000005c0 6f 75 20 68 61 76 65 2e 20 0d 20 20 20 20 20 20 |ou have. . | 000005d0 20 20 20 52 2e 50 2e 53 70 72 6f 77 73 6f 6e 2e | R.P.Sprowson.| 000005e0 20 0d 0d 59 4f 55 52 20 4d 4f 44 49 46 49 43 41 | ..YOUR MODIFICA| 000005f0 54 49 4f 4e 53 20 54 4f 20 52 49 43 48 41 52 44 |TIONS TO RICHARD| 00000600 27 53 20 50 52 4f 47 52 41 4d 53 20 48 41 56 45 |'S PROGRAMS HAVE| 00000610 20 4e 45 56 45 52 20 46 41 49 4c 45 44 20 59 45 | NEVER FAILED YE| 00000620 54 20 53 4f 20 54 48 49 53 20 4f 4e 45 0d 57 49 |T SO THIS ONE.WI| 00000630 4c 4c 20 42 45 20 41 44 44 45 44 2e 20 0d 0d 46 |LL BE ADDED. ..F| 00000640 4f 52 20 54 48 45 20 41 44 46 53 20 4d 45 4d 42 |OR THE ADFS MEMB| 00000650 45 52 53 2c 20 41 53 20 59 4f 55 20 4b 4e 4f 57 |ERS, AS YOU KNOW| 00000660 20 54 48 45 20 44 46 53 20 43 41 54 41 4c 4f 47 | THE DFS CATALOG| 00000670 55 45 20 43 41 4e 20 4f 4e 4c 59 20 48 4f 4c 44 |UE CAN ONLY HOLD| 00000680 20 33 30 20 4f 52 20 53 4f 0d 46 49 4c 45 53 2e | 30 OR SO.FILES.| 00000690 20 54 4f 20 47 45 54 20 4f 56 45 52 20 54 48 49 | TO GET OVER THI| 000006a0 53 20 49 20 48 41 56 45 20 42 45 45 4e 20 55 53 |S I HAVE BEEN US| 000006b0 49 4e 47 20 46 4c 49 50 50 59 53 20 57 48 45 52 |ING FLIPPYS WHER| 000006c0 45 20 35 2e 32 35 22 20 44 49 53 43 53 20 57 45 |E 5.25" DISCS WE| 000006d0 52 45 0d 50 48 59 53 49 43 41 4c 4c 59 20 54 55 |RE.PHYSICALLY TU| 000006e0 52 4e 45 44 20 4f 56 45 52 20 54 4f 20 41 43 43 |RNED OVER TO ACC| 000006f0 45 53 53 20 54 48 45 20 53 45 43 4f 4e 44 20 53 |ESS THE SECOND S| 00000700 49 44 45 2e 20 4e 4f 57 20 54 48 41 4e 4b 53 20 |IDE. NOW THANKS | 00000710 4f 46 20 43 4f 55 52 53 45 20 54 4f 0d 52 49 43 |OF COURSE TO.RIC| 00000720 48 41 52 44 20 44 49 4d 4f 4e 44 2c 20 57 48 4f |HARD DIMOND, WHO| 00000730 20 45 4c 53 45 2c 20 57 45 20 48 41 56 45 20 41 | ELSE, WE HAVE A| 00000740 20 44 55 41 4c 20 43 41 54 41 4c 4f 47 55 45 20 | DUAL CATALOGUE | 00000750 46 41 43 49 4c 49 54 59 20 46 4f 52 20 45 55 47 |FACILITY FOR EUG| 00000760 20 44 46 53 2e 0d 41 53 20 49 54 20 48 41 50 50 | DFS..AS IT HAPP| 00000770 45 4e 53 20 57 45 20 41 4c 53 4f 20 48 41 56 45 |ENS WE ALSO HAVE| 00000780 20 41 4e 4f 54 48 45 52 20 50 52 4f 47 52 41 4d | ANOTHER PROGRAM| 00000790 20 57 48 49 43 48 20 49 53 20 53 54 49 4c 4c 20 | WHICH IS STILL | 000007a0 42 45 49 4e 47 20 45 56 41 4c 55 41 54 45 44 0d |BEING EVALUATED.| 000007b0 57 48 49 43 48 20 57 49 4c 4c 20 50 55 54 20 4d |WHICH WILL PUT M| 000007c0 55 4c 54 49 50 55 4c 20 43 41 54 41 4c 4f 47 55 |ULTIPUL CATALOGU| 000007d0 45 53 2c 20 55 50 20 54 4f 20 39 30 20 49 20 54 |ES, UP TO 90 I T| 000007e0 48 49 4e 4b 20 4f 4e 20 41 20 53 49 4e 47 4c 45 |HINK ON A SINGLE| 000007f0 20 44 49 53 43 2e 20 0d 0d 2a 2a 2a 2a 2a 2a 2a | DISC. ..*******| 00000800 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a |****************| * 00000840 0d 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |. | 00000850 20 20 20 20 36 20 42 6f 6c 6c 69 6e 62 72 6f 6f | 6 Bollinbroo| 00000860 6b 20 72 6f 61 64 2c 20 0d 20 20 20 20 20 20 20 |k road, . | 00000870 20 20 20 20 20 20 20 20 20 20 20 20 20 4d 41 43 | MAC| 00000880 43 4c 45 53 46 49 45 4c 44 2c 20 0d 20 20 20 20 |CLESFIELD, . | 00000890 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 000008a0 20 43 68 65 73 68 69 72 65 2e 20 0d 20 20 20 20 | Cheshire. . | 000008b0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 000008c0 20 20 53 4b 31 30 20 33 44 4a 2e 20 0d 20 0d 44 | SK10 3DJ. . .D| 000008d0 65 61 72 20 41 6c 61 6e 20 52 69 63 68 61 72 64 |ear Alan Richard| 000008e0 73 6f 6e 2c 20 0d 20 20 20 20 20 20 20 20 20 20 |son, . | 000008f0 20 20 20 20 20 20 20 20 20 20 20 54 68 65 20 6f | The o| 00000900 6e 6c 79 20 63 6f 6d 70 61 6e 79 20 0d 74 68 61 |nly company .tha| 00000910 74 20 49 20 63 61 6e 20 74 68 69 6e 6b 20 6f 66 |t I can think of| 00000920 20 74 6f 20 68 65 6c 70 20 79 6f 75 20 77 69 74 | to help you wit| 00000930 68 20 0d 66 6c 79 62 61 63 6b 20 74 72 61 6e 73 |h .flyback trans| 00000940 66 6f 72 6d 65 72 73 20 69 73 20 22 47 72 61 6e |formers is "Gran| 00000950 64 61 74 61 22 20 0d 68 65 72 65 20 69 6e 20 74 |data" .here in t| 00000960 68 65 20 55 4b 2e 20 0d 20 20 20 49 20 63 6f 75 |he UK. . I cou| 00000970 6c 64 6e 27 74 20 73 65 65 20 61 6e 20 65 78 61 |ldn't see an exa| 00000980 63 74 20 65 71 75 69 76 61 6c 65 6e 74 2c 20 0d |ct equivalent, .| 00000990 62 75 74 20 6d 61 79 62 65 20 61 20 6e 69 63 65 |but maybe a nice| 000009a0 20 6c 65 74 74 65 72 20 66 72 6f 6d 20 4e 5a 20 | letter from NZ | 000009b0 77 6f 75 6c 64 20 0d 70 72 6f 6d 70 74 20 74 68 |would .prompt th| 000009c0 65 6d 3a 20 0d 20 0d 20 20 20 47 72 61 6e 64 61 |em: . . Granda| 000009d0 74 61 20 4c 69 6d 69 74 65 64 2c 20 0d 20 20 20 |ta Limited, . | 000009e0 4b 50 20 48 6f 75 73 65 2c 55 6e 69 74 20 31 35 |KP House,Unit 15| 000009f0 2c 20 0d 20 20 20 50 6f 70 20 69 6e 20 43 6f 6d |, . Pop in Com| 00000a00 6d 65 72 63 69 61 6c 20 63 65 6e 74 72 65 2c 20 |mercial centre, | 00000a10 0d 20 20 20 53 6f 75 74 68 77 61 79 2c 20 0d 20 |. Southway, . | 00000a20 20 20 57 45 4d 42 4c 45 59 2e 4d 69 64 64 6c 65 | WEMBLEY.Middle| 00000a30 73 65 78 2e 20 0d 20 20 20 48 41 39 20 30 48 42 |sex. . HA9 0HB| 00000a40 2e 20 0d 20 0d 20 20 20 54 65 6c 65 3a 20 30 31 |. . . Tele: 01| 00000a50 38 31 20 39 30 30 20 32 33 32 39 20 0d 20 20 20 |81 900 2329 . | 00000a60 46 61 78 3a 20 30 31 38 31 20 39 30 33 20 36 31 |Fax: 0181 903 61| 00000a70 32 36 20 0d 20 0d 59 6f 75 20 6d 61 79 20 77 61 |26 . .You may wa| 00000a80 6e 74 20 74 6f 20 6d 65 6e 74 69 6f 6e 20 50 31 |nt to mention P1| 00000a90 39 32 20 6f 66 20 74 68 65 69 72 20 0d 63 61 74 |92 of their .cat| 00000aa0 61 6c 6f 67 75 65 2e 20 0d 20 20 20 20 20 20 20 |alogue. . | 00000ab0 20 20 20 52 2e 50 2e 53 70 72 6f 77 73 6f 6e 2e | R.P.Sprowson.| 00000ac0 20 0d 20 0d 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a | . .************| 00000ad0 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a |****************| * 00000b00 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 2a 0d 20 20 20 20 |***********. | 00000b10 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 36 | 6| 00000b20 20 42 6f 6c 6c 69 6e 62 72 6f 6f 6b 20 72 6f 61 | Bollinbrook roa| 00000b30 64 2c 20 0d 20 20 20 20 20 20 20 20 20 20 20 20 |d, . | 00000b40 20 20 20 20 20 20 20 20 4d 41 43 43 4c 45 53 46 | MACCLESF| 00000b50 49 45 4c 44 2c 20 0d 20 20 20 20 20 20 20 20 20 |IELD, . | 00000b60 20 20 20 20 20 20 20 20 20 20 20 20 43 68 65 73 | Ches| 00000b70 68 69 72 65 2e 20 0d 20 20 20 20 20 20 20 20 20 |hire. . | 00000b80 20 20 20 20 20 20 20 20 20 20 20 20 20 53 4b 31 | SK1| 00000b90 30 20 33 44 4a 2e 20 0d 20 0d 44 65 61 72 20 4d |0 3DJ. . .Dear M| 00000ba0 61 72 6b 20 42 65 6c 6c 69 73 2c 20 0d 20 20 20 |ark Bellis, . | 00000bb0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 59 6f | Yo| 00000bc0 75 20 77 65 72 65 20 77 6f 6e 64 65 72 69 6e 67 |u were wondering| 00000bd0 20 20 61 62 6f 75 74 20 68 6f 77 20 43 69 74 61 | about how Cita| 00000be0 64 65 6c 2f 54 68 72 75 73 74 20 73 63 72 65 65 |del/Thrust scree| 00000bf0 6e 20 0d 73 63 72 6f 6c 6c 69 6e 67 20 77 6f 72 |n .scrolling wor| 00000c00 6b 65 64 2c 61 6e 64 2c 6a 75 64 67 69 6e 67 20 |ked,and,judging | 00000c10 62 79 20 79 6f 75 72 20 20 6f 74 68 65 72 20 63 |by your other c| 00000c20 6f 6d 6d 65 6e 74 73 20 69 6e 20 79 6f 75 72 20 |omments in your | 00000c30 6c 65 74 74 65 72 20 79 6f 75 0d 6b 6e 6f 77 20 |letter you.know | 00000c40 20 77 68 61 74 20 79 6f 75 27 72 65 20 64 6f 69 | what you're doi| 00000c50 6e 67 2e 20 0d 0d 20 20 20 49 66 20 67 65 74 74 |ng. .. If gett| 00000c60 69 6e 67 20 74 68 65 20 6c 6f 61 64 65 72 20 70 |ing the loader p| 00000c70 72 6f 67 72 61 6d 20 74 6f 20 20 45 4f 52 20 74 |rogram to EOR t| 00000c80 68 65 20 66 69 6c 65 20 61 6e 64 20 74 68 65 6e |he file and then| 00000c90 20 64 69 73 61 73 73 65 6d 62 6c 69 6e 67 20 0d | disassembling .| 00000ca0 74 68 69 73 20 74 6f 20 66 69 6e 64 20 6f 75 74 |this to find out| 00000cb0 20 68 6f 77 20 74 68 65 20 73 63 72 65 65 6e 20 | how the screen | 00000cc0 77 6f 72 6b 73 20 20 69 73 20 74 6f 6f 20 68 61 |works is too ha| 00000cd0 72 64 2c 6c 65 74 20 49 54 20 64 6f 20 74 68 65 |rd,let IT do the| 00000ce0 20 77 6f 72 6b 20 66 6f 72 20 0d 79 6f 75 2e 20 | work for .you. | 00000cf0 0d 0d 20 20 20 57 72 69 74 65 20 61 20 72 6f 6d |.. Write a rom| 00000d00 20 77 68 69 63 68 20 74 72 61 70 73 20 74 68 65 | which traps the| 00000d10 20 27 42 52 4b 20 20 6f 63 63 75 72 65 64 27 20 | 'BRK occured' | 00000d20 73 65 72 76 69 63 65 20 63 61 6c 6c 20 28 6e 75 |service call (nu| 00000d30 6d 62 65 72 20 36 29 20 0d 74 68 65 6e 2c 68 61 |mber 6) .then,ha| 00000d40 76 69 6e 67 20 64 65 74 65 63 74 65 64 20 74 68 |ving detected th| 00000d50 61 74 2c 69 73 73 75 65 20 61 20 20 2a 54 41 50 |at,issue a *TAP| 00000d60 45 20 28 69 65 2e 2a 46 58 31 34 30 2c 62 61 75 |E (ie.*FX140,bau| 00000d70 64 29 20 61 6e 64 20 2a 53 41 56 45 20 74 68 65 |d) and *SAVE the| 00000d80 20 0d 77 68 6f 6c 65 20 6f 66 20 74 68 65 20 42 | .whole of the B| 00000d90 42 43 27 73 20 6d 65 6d 6f 72 79 20 74 6f 20 74 |BC's memory to t| 00000da0 61 70 65 2e 20 0d 0d 20 20 20 54 61 70 65 20 69 |ape. .. Tape i| 00000db0 73 20 6f 62 76 69 6f 75 73 6c 79 20 75 73 65 64 |s obviously used| 00000dc0 20 61 73 20 69 74 20 64 6f 65 73 20 20 6e 6f 74 | as it does not| 00000dd0 20 67 6f 62 62 6c 65 20 74 68 65 20 32 2e 37 35 | gobble the 2.75| 00000de0 6b 20 74 68 61 74 20 44 46 53 0d 64 6f 65 73 2c |k that DFS.does,| 00000df0 61 6e 64 20 20 61 6c 73 6f 20 6d 6f 73 74 20 67 |and also most g| 00000e00 61 6d 65 73 20 72 65 6c 6f 63 61 74 65 20 74 68 |ames relocate th| 00000e10 65 6d 73 65 6c 76 65 73 20 20 6f 76 65 72 20 74 |emselves over t| 00000e20 68 65 20 6c 61 6e 67 75 61 67 65 20 61 6e 64 20 |he language and | 00000e30 4e 4d 49 0d 77 6f 72 6b 73 70 61 63 65 20 20 66 |NMI.workspace f| 00000e40 72 6f 6d 20 26 44 46 46 20 61 6e 64 20 62 65 6c |rom &DFF and bel| 00000e50 6f 77 20 28 69 6e 20 74 68 65 20 42 42 43 29 2e |ow (in the BBC).| 00000e60 20 0d 0d 20 20 20 4e 6f 77 20 61 6c 6c 20 79 6f | .. Now all yo| 00000e70 75 20 6e 65 65 64 20 74 6f 20 64 6f 20 69 73 20 |u need to do is | 00000e80 63 61 75 73 65 20 61 6e 20 20 65 72 72 6f 72 20 |cause an error | 00000e90 2d 20 45 73 63 61 70 65 20 75 73 75 61 6c 6c 79 |- Escape usually| 00000ea0 20 77 6f 72 6b 73 20 2d 20 62 75 74 20 0d 74 68 | works - but .th| 00000eb0 69 73 20 6d 61 79 20 68 61 76 65 20 62 65 65 6e |is may have been| 00000ec0 20 74 75 72 6e 65 64 20 6f 66 66 20 74 6f 20 61 | turned off to a| 00000ed0 6c 6c 6f 77 20 20 69 74 20 74 6f 20 62 65 20 75 |llow it to be u| 00000ee0 73 65 64 20 69 6e 73 74 65 61 64 20 74 6f 20 74 |sed instead to t| 00000ef0 6f 67 67 6c 65 20 0d 62 65 74 77 65 65 6e 20 74 |oggle .between t| 00000f00 68 65 20 73 63 6f 72 65 62 6f 61 72 64 20 61 6e |he scoreboard an| 00000f10 64 20 74 68 65 20 67 61 6d 65 2e 49 66 20 20 74 |d the game.If t| 00000f20 68 69 73 20 69 73 20 74 68 65 20 63 61 73 65 20 |his is the case | 00000f30 74 68 65 6e 20 74 72 61 70 20 73 65 72 76 69 63 |then trap servic| 00000f40 65 20 0d 63 61 6c 6c 20 35 20 28 49 52 51 20 6e |e .call 5 (IRQ n| 00000f50 6f 74 20 72 65 63 6f 67 6e 69 73 65 64 29 20 69 |ot recognised) i| 00000f60 6e 73 74 65 61 64 20 20 2c 61 6e 64 20 73 68 6f |nstead ,and sho| 00000f70 72 74 20 70 69 6e 20 37 20 74 6f 20 70 69 6e 20 |rt pin 7 to pin | 00000f80 38 20 6f 6e 20 74 68 65 20 31 4d 48 7a 20 0d 62 |8 on the 1MHz .b| 00000f90 75 73 2e 20 0d 0d 20 20 20 48 6f 70 65 20 74 68 |us. .. Hope th| 00000fa0 69 73 20 68 61 73 20 62 65 65 6e 20 6f 66 20 73 |is has been of s| 00000fb0 6f 6d 65 20 20 68 65 6c 70 2c 6c 6f 6f 6b 20 66 |ome help,look f| 00000fc0 6f 72 77 61 72 64 20 74 6f 20 73 65 65 69 6e 67 |orward to seeing| 00000fd0 20 74 68 65 20 67 61 6d 65 73 20 0d 79 6f 75 27 | the games .you'| 00000fe0 72 65 20 70 72 6f 64 75 63 69 6e 67 2e 20 0d 20 |re producing. . | 00000ff0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 00001000 52 2e 50 2e 53 70 72 6f 77 73 6f 6e 2e 20 0d |R.P.Sprowson. .| 0000100f
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