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02-09-88/T\DFS04
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 » CEEFAX disks » telesoftware9.adl |
| Filename: | 02-09-88/T\DFS04 |
| Read OK: | ✔ |
| File size: | 3D26 bytes |
| Load address: | 0000 |
| Exec address: | FFFFFFFF |
File contents
The Acorn DFS Osword commands - by - Gordon Horsington
----------------------------------------------------------
Module 4. Converting 40 track discs for 80 track drives
-------------------------------------------------------
+----------------------------------------------------------+
| All the DFS modules in this series use programs which |
| experiment with the format and contents of discs. These |
| experiments may have disasterous effects if you use any |
| of the programs on discs which store programs or data |
| which you cannot afford to lose. You should first try |
| out the programs using discs that have either been |
| duplicated or, better still, have not been used at all. |
+----------------------------------------------------------+
In this module I will examine the problem of modifying forty track discs
so that they work properly on eighty track disc drives.
There are a number of possible solutions to the problem of using forty
track discs on an eighty track disc drive. If you have a 40/80 track
switchable disc drive it is possible to use *BACKUP 0 0 and switch the
track density selector from forty to eighty before inserting an eighty
track disc and then switch back to forty for the forty track disc. If you
use dual switchable drives this can be a less error prone method because
you would not have to remember to switch the drives between reading and
writing. One problem with this method is that, although it will produce a
disc which can be used on an eighty track disc drive, it will only use
forty of the eighty tracks. This could be overcome by using the *COPY
command and switching the track density selector appropriately. A
philosophical problem with using either of these methods to make the
conversion is that the conversion itself is pointless if you have
switchable disc drives.
The real problem exists for disc users who have a forty track disc and
only one eighty track disc drive. In these circumstances it is necessary
to modify the disc itself so that it becomes an eighty track disc. In this
module I will demonstrate how to use the Osword &7F commands to modify a
forty track disc on an eighty track disc drive so that the forty track
disc becomes an eighty track disc.
Forty track discs have a track density exactly one half of that used by
eighty track discs. Track &00 of both forty and eighty track discs share
the same physical position as the outer track on the disc. Track &01 on a
forty track disc is in the same physical position as track &02 on an
eighty track disc, track &02 is in the same position as track &04, and so
on. The relative position of the physical tracks on forty and eighty track
discs is shown in figure 1.
40T> 00 01 ... 09 0A 0B ... 13 14 15 ... 25 26 27
80T> 00 01 02 ... 12 13 14 15 16 ... 26 27 28 29 2A ... 4A 4B 4C 4D 4E 4F
Figure 1. The relative position of tracks on 40 and 80 track discs
------------------------------------------------------------------
All the numbers in figure 1 are in hexadecimal and I am using the term
track density to refer to the physical proximity of the tracks (which are
closer together on 80 track discs). Because the track density of an eighty
track disc is twice that of a forty track disc, an eighty track disc is
sometimes refered to as double density even if it uses the single density
format. I will not refer to 80 track discs as double density because this
can be confused with the double density ADFS, which can use 80 track discs
in a double density format.
If you look at figure 1 you should be able to work out what needs to be
done to make forty track discs work on an eighty track disc drive. Because
track &00 is in the same physical position with both forty and eighty
track discs, any data on track &00 can be accessed with either type of
disc drive. All the other tracks on a forty track disc are in the wrong
physical position to be read on an eighty track disc drive. Assuming that
you have an Acorn DFS forty track disc in an eighty track disc drive, you
will need to copy physical track &02 (logical track &01) onto physical
track &01, copy physical track &04 (logical track &02) onto physical track
&02 and so on until physical track &4E (logical track &27) is copied onto
physical track &27. This copying is summarised in figure 2.
Read physical track -> Format and write physical track
&00 -> &00
&02 -> &01
&04 -> &02
&06 -> &03
.
.
.
&4B -> &25
&4C -> &26
&4E -> &27
Figure 2. The required copying of physical tracks
-------------------------------------------------
You should note that figure 2 refers to the physical tracks and not the
logical tracks. This is important because, with Acorn DFS forty track
discs in an eighty track disc drive, physical track &02 will contain
logical track &01, physical track &04 will contain logical track &02, and
so on. It will be necessary to re-format each physical track after reading
and before writing the data back onto the disc. This is because the odd
numbered tracks will be unformatted and the even numbered tracks will have
the wrong logical track numbers in their ID fields.
When all forty tracks have been copied you can then go on to format the
tracks from &28 to &4F to make the disc an eighty track disc. In order
that the DFS can access all eighty tracks it is necessary to modify the
catalogue to indicate that 800 (&320) sectors are available. The number of
sectors is stored in bytes &06 (MSB) and &07 (LSB) of track &00, sector
&00. Note that it is not LSB and MSB as you might expect.
The following algorithm can be used to implement this idea.
1) Start with current track number = &00
2) Seek current track * 2 (ie. for logical track &01 seek &02, and so on)
3) Write the current track number into the track register (number &12).
The head is now positioned above the appropriate track for reading the
data and the track register also contains the logical track number.
4) Read the entire track into a buffer.
5) Write the current track number * 2 into the track register.
6) Format the physical track indicated by the current track number.
7) Write the contents of the buffer onto the newly formatted track.
8) Increment the current track number. If the current track number is less
than &28 go back to 2) to copy the next track.
9) All forty tracks have been converted. Now format tracks &28 to &4F to
create an eighty track disc.
10) Read the contents of track &00, sector &01 into a buffer.
11) OR the contents of buffer+&06 with the number &03, and store the
number &20 in buffer+&07 to indicate that &320 (800) sectors are
available on the disc.
12) Write the contents of the buffer back onto track &00, sector &01.
This algorithm has been implemented in the program CONVERT. You can use
the program CONVERT with an eighty track drive &00 to convert an Acorn
formatted 40 track single density disc into an eighty track single density
disc. The program will not work with copy-protected discs and you should
only use it if you have a duplicate of the disc you intend to convert.
If you use CONVERT and press the Escape key before it has finished the
conversion you will probably destroy some or all the data on the disc. Do
not use the program with a forty track disc drive. You have been warned to
be careful with all the programs used to illustrate this series. This
program can easily destroy all the data on your disc if you fail to use it
with care.
If you want to modify the program to make it more idiot proof you could
delete line 130 to take out the routine which polls the Escape flag. This
would make the program safer for ham-fisted or inexperienced users because
pressing Escape would not halt the program before it had finished.
Whatever modifications you make to this or any other of the programs used
to ilustrate the DFS modules of the series, don't ignore the warning about
the potentially disasterous effects these programs can have on your discs.
10 REM: CONVERT
20 osnewl=&FFE7
30 oswrch=&FFEE
40 osword=&FFF1
50 osbyte=&FFF4
60 DIM mcode &500
70 DIM buffer &1000
80 FOR pass=0 TO 2 STEP 2
90 P%=mcode
100 [ OPT pass
110 JSR osnewl
120 .mainloop
130 JSR escape \ check escape flag
140 JSR seektwo \ seek track * 2
150 LDA track \ load logical track number
160 JSR register \ write track register
170 JSR read \ read logical track
180 LDA track \ load logical track number
190 ASL A \ *2 = physical track
200 JSR register \ write track register
210 JSR format \ format physical track
220 JSR write \ write data onto disc
230 JSR printbyte \ print track number
240 INC track \ get ready for next track
250 LDA track \ load logical track number
260 CMP #40 \ is it track 40?
270 BNE mainloop \ if not read next track
280 .formloop
290 JSR escape \ check escape flag
300 JSR format \ format tracks 40 - 79
310 JSR printbyte \ print track number
320 INC track \ increment track number
330 LDA track \ load track number
340 CMP #80 \ is it 80?
350 BNE formloop \ if not format next track
360 LDA #0 \ go back to track 0
370 STA track
380 STA copyblock+7
390 LDA #1 \ sector 1
400 STA copyblock+8
410 LDA #&21 \ 1 sector of 256 bytes
420 STA copyblock+9
430 JSR read \ read track 0 sector 1
440 LDA #&03 \ 800 sectors DIV 256
450 ORA buffer+6 \ keep old *OPT4,n option
460 STA buffer+6 \ MSB number of sectors
470 LDA #&20 \ 800 sectors MOD 256
480 STA buffer+7 \ LSB number of sectors
490 JSR write \ store track 0 sector 1
500 JSR osnewl
510 RTS \ return to BASIC
520 .escape
530 LDA &FF \ escape flag
540 BMI pressed \ bit 7 set if pressed
550 RTS
560 .pressed
570 LDA #&7E
580 JSR osbyte \ acknowledge Escape
590 BRK
600 BRK
610 EQUS "Escape"
620 BRK
630 .seektwo
640 LDA track \ source track number
650 ASL A \ *2
660 STA seekblock+7 \ physical track number
670 LDA #&7F
680 LDX #seekblock MOD 256
690 LDY #seekblock DIV 256
700 JSR osword
710 LDA seekblock+8 \ result
720 BNE seekerror \ = 0 if OK
730 RTS
740 .seekerror
750 BRK
760 BRK
770 EQUS "Seek error"
780 BRK
790 .format
800 LDA track \ source track number
810 STA formblock+7 \ store physical track
820 LDX #36
830 .tableloop
840 STA table,X \ store logical track number in ID table
850 DEX
860 DEX
870 DEX
880 DEX
890 BPL tableloop
900 LDA #&7F
910 LDX #formblock MOD 256
920 LDY #formblock DIV 256
930 JSR osword
940 LDA formblock+12 \ result
950 BNE formerror \ = 0 if OK
960 RTS
970 .formerror
980 BRK
990 BRK
1000 EQUS "Format error"
1010 BRK
1020 .register
1030 STA regblock+8 \ value to put in register
1040 LDA #&7F
1050 LDX #regblock MOD 256
1060 LDY #regblock DIV 256
1070 JSR osword
1080 LDA regblock+9 \ result
1090 BNE regerror \ = 0 if OK
1100 RTS
1110 .regerror
1120 BRK
1130 BRK
1140 EQUS "Special register error"
1150 BRK
1160 .read
1170 LDA track \ source track number
1180 STA copyblock+7 \ logical track number
1190 LDA #&53 \ read data multi-sector
1200 STA copyblock+6
1210 LDA #&7F
1220 LDX #copyblock MOD 256
1230 LDY #copyblock DIV 256
1240 JSR osword
1250 LDA copyblock+10
1260 BNE readerror
1270 RTS
1280 .readerror
1290 BRK
1300 BRK
1310 EQUS "Read error"
1320 BRK
1330 .write
1340 LDA #&4B \ write data multi-sector
1350 STA copyblock+6
1360 LDA #&7F
1370 LDX #copyblock MOD 256
1380 LDY #copyblock DIV 256
1390 JSR osword
1400 LDA copyblock+10 \ result
1410 BNE writeerror \ = 0 if OK
1420 RTS
1430 .writeerror
1440 BRK
1450 BRK
1460 EQUS "Write error"
1470 BRK
1480 .printbyte
1490 LDA track \ print source track number
1500 PHA
1510 LSR A
1520 LSR A
1530 LSR A
1540 LSR A
1550 JSR nybble \ print MS nybble
1560 PLA
1570 JSR nybble \ print LS nybble
1580 LDA #ASC(" ")
1590 JSR oswrch \ print space
1600 JMP oswrch \ print space
1610 .nybble
1620 AND #&0F
1630 SED
1640 CLC
1650 ADC #&90
1660 ADC #&40
1670 CLD
1680 JMP oswrch \ print nybble and return
1690 .seekblock
1700 EQUB &00 \ drive 0
1710 EQUD &00 \ does not matter
1720 EQUB &01 \ 1 parameter
1730 EQUB &69 \ seek command
1740 EQUB &00 \ physical track
1750 EQUB &00 \ result byte
1760 .regblock
1770 EQUB &00 \ drive 0
1780 EQUD &00 \ does not matter
1790 EQUD &00127A02 \ write special register
1800 EQUB &00 \ result byte
1810 .copyblock
1820 EQUB &00 \ drive 0
1830 EQUD buffer \ address of buffer
1840 EQUB &03 \ 3 parameters
1850 EQUB &57 \ read data multi-sector
1860 EQUB &00 \ logical track number
1870 EQUB &00 \ logical sector number
1880 EQUB &2A \ 10 sectors of 256 bytes
1890 EQUB &00 \ result byte
1900 .formblock
1910 EQUB &00 \ drive 0
1920 EQUD table \ address of sector table
1930 EQUB &05 \ 5 parameters
1940 EQUB &63 \ format command
1950 EQUB &00 \ physical track number
1960 EQUB &15 \ gap 3 size
1970 EQUB &2A \ 10 sectors of 256 bytes
1980 EQUB &00 \ gap 5 size
1990 EQUB &10 \ gap 1 size
2000 EQUB &00 \ result byte
2010 .table
2020 EQUD &01000000
2030 EQUD &01010000
2040 EQUD &01020000
2050 EQUD &01030000
2060 EQUD &01040000
2070 EQUD &01050000
2080 EQUD &01060000
2090 EQUD &01070000
2100 EQUD &01080000
2110 EQUD &01090000
2120 .track
2130 EQUB &00 \ logical track number
2140 ]
2150 NEXT
2160 PRINT'"Place 40 track disc in 80 track drive 0"
2170 PRINT"Press Spacebar to convert to 80 tracks"
2180 REPEAT
2190 UNTIL GET = 32
2200 CALL mcode
00000000 54 68 65 20 41 63 6f 72 6e 20 44 46 53 20 4f 73 |The Acorn DFS Os|
00000010 77 6f 72 64 20 63 6f 6d 6d 61 6e 64 73 20 20 2d |word commands -|
00000020 20 20 62 79 20 20 2d 20 20 47 6f 72 64 6f 6e 20 | by - Gordon |
00000030 48 6f 72 73 69 6e 67 74 6f 6e 0d 2d 2d 2d 2d 2d |Horsington.-----|
00000040 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00000070 2d 2d 2d 2d 2d 0d 0d 4d 6f 64 75 6c 65 20 34 2e |-----..Module 4.|
00000080 20 43 6f 6e 76 65 72 74 69 6e 67 20 34 30 20 74 | Converting 40 t|
00000090 72 61 63 6b 20 64 69 73 63 73 20 66 6f 72 20 38 |rack discs for 8|
000000a0 30 20 74 72 61 63 6b 20 64 72 69 76 65 73 0d 2d |0 track drives.-|
000000b0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
000000e0 2d 2d 2d 2d 2d 2d 0d 0d 20 20 20 20 20 20 2b 2d |------.. +-|
000000f0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00000120 2d 2d 2d 2d 2d 2d 2d 2d 2d 2b 0d 20 20 20 20 20 |---------+. |
00000130 20 7c 20 41 6c 6c 20 74 68 65 20 44 46 53 20 6d | | All the DFS m|
00000140 6f 64 75 6c 65 73 20 69 6e 20 20 74 68 69 73 20 |odules in this |
00000150 20 73 65 72 69 65 73 20 20 75 73 65 20 70 72 6f | series use pro|
00000160 67 72 61 6d 73 20 77 68 69 63 68 20 7c 0d 20 20 |grams which |. |
00000170 20 20 20 20 7c 20 65 78 70 65 72 69 6d 65 6e 74 | | experiment|
00000180 20 20 77 69 74 68 20 74 68 65 20 66 6f 72 6d 61 | with the forma|
00000190 74 20 61 6e 64 20 63 6f 6e 74 65 6e 74 73 20 6f |t and contents o|
000001a0 66 20 64 69 73 63 73 2e 20 54 68 65 73 65 20 7c |f discs. These ||
000001b0 0d 20 20 20 20 20 20 7c 20 65 78 70 65 72 69 6d |. | experim|
000001c0 65 6e 74 73 20 6d 61 79 20 20 68 61 76 65 20 64 |ents may have d|
000001d0 69 73 61 73 74 65 72 6f 75 73 20 65 66 66 65 63 |isasterous effec|
000001e0 74 73 20 69 66 20 79 6f 75 20 75 73 65 20 61 6e |ts if you use an|
000001f0 79 20 7c 0d 20 20 20 20 20 20 7c 20 6f 66 20 74 |y |. | of t|
00000200 68 65 20 70 72 6f 67 72 61 6d 73 20 20 6f 6e 20 |he programs on |
00000210 20 64 69 73 63 73 20 20 77 68 69 63 68 20 73 74 | discs which st|
00000220 6f 72 65 20 70 72 6f 67 72 61 6d 73 20 6f 72 20 |ore programs or |
00000230 64 61 74 61 20 7c 0d 20 20 20 20 20 20 7c 20 77 |data |. | w|
00000240 68 69 63 68 20 79 6f 75 20 63 61 6e 6e 6f 74 20 |hich you cannot |
00000250 61 66 66 6f 72 64 20 74 6f 20 6c 6f 73 65 2e 20 |afford to lose. |
00000260 20 59 6f 75 20 20 73 68 6f 75 6c 64 20 20 66 69 | You should fi|
00000270 72 73 74 20 74 72 79 20 7c 0d 20 20 20 20 20 20 |rst try |. |
00000280 7c 20 6f 75 74 20 20 74 68 65 20 20 70 72 6f 67 || out the prog|
00000290 72 61 6d 73 20 20 75 73 69 6e 67 20 20 64 69 73 |rams using dis|
000002a0 63 73 20 20 74 68 61 74 20 20 68 61 76 65 20 65 |cs that have e|
000002b0 69 74 68 65 72 20 62 65 65 6e 20 7c 0d 20 20 20 |ither been |. |
000002c0 20 20 20 7c 20 64 75 70 6c 69 63 61 74 65 64 20 | | duplicated |
000002d0 6f 72 2c 20 62 65 74 74 65 72 20 73 74 69 6c 6c |or, better still|
000002e0 2c 20 68 61 76 65 20 6e 6f 74 20 62 65 65 6e 20 |, have not been |
000002f0 75 73 65 64 20 61 74 20 61 6c 6c 2e 20 20 7c 0d |used at all. |.|
00000300 20 20 20 20 20 20 2b 2d 2d 2d 2d 2d 2d 2d 2d 2d | +---------|
00000310 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00000340 2d 2b 0d 0d 0d 49 6e 20 74 68 69 73 20 6d 6f 64 |-+...In this mod|
00000350 75 6c 65 20 49 20 77 69 6c 6c 20 65 78 61 6d 69 |ule I will exami|
00000360 6e 65 20 74 68 65 20 70 72 6f 62 6c 65 6d 20 6f |ne the problem o|
00000370 66 20 6d 6f 64 69 66 79 69 6e 67 20 66 6f 72 74 |f modifying fort|
00000380 79 20 74 72 61 63 6b 20 64 69 73 63 73 0d 73 6f |y track discs.so|
00000390 20 74 68 61 74 20 74 68 65 79 20 77 6f 72 6b 20 | that they work |
000003a0 70 72 6f 70 65 72 6c 79 20 6f 6e 20 65 69 67 68 |properly on eigh|
000003b0 74 79 20 74 72 61 63 6b 20 64 69 73 63 20 64 72 |ty track disc dr|
000003c0 69 76 65 73 2e 0d 0d 54 68 65 72 65 20 61 72 65 |ives...There are|
000003d0 20 61 20 6e 75 6d 62 65 72 20 6f 66 20 70 6f 73 | a number of pos|
000003e0 73 69 62 6c 65 20 73 6f 6c 75 74 69 6f 6e 73 20 |sible solutions |
000003f0 74 6f 20 74 68 65 20 70 72 6f 62 6c 65 6d 20 6f |to the problem o|
00000400 66 20 75 73 69 6e 67 20 66 6f 72 74 79 0d 74 72 |f using forty.tr|
00000410 61 63 6b 20 64 69 73 63 73 20 6f 6e 20 61 6e 20 |ack discs on an |
00000420 65 69 67 68 74 79 20 74 72 61 63 6b 20 64 69 73 |eighty track dis|
00000430 63 20 64 72 69 76 65 2e 20 49 66 20 79 6f 75 20 |c drive. If you |
00000440 68 61 76 65 20 61 20 34 30 2f 38 30 20 74 72 61 |have a 40/80 tra|
00000450 63 6b 0d 73 77 69 74 63 68 61 62 6c 65 20 64 69 |ck.switchable di|
00000460 73 63 20 64 72 69 76 65 20 69 74 20 69 73 20 70 |sc drive it is p|
00000470 6f 73 73 69 62 6c 65 20 74 6f 20 75 73 65 20 2a |ossible to use *|
00000480 42 41 43 4b 55 50 20 30 20 30 20 61 6e 64 20 73 |BACKUP 0 0 and s|
00000490 77 69 74 63 68 20 74 68 65 0d 74 72 61 63 6b 20 |witch the.track |
000004a0 64 65 6e 73 69 74 79 20 73 65 6c 65 63 74 6f 72 |density selector|
000004b0 20 66 72 6f 6d 20 66 6f 72 74 79 20 74 6f 20 65 | from forty to e|
000004c0 69 67 68 74 79 20 62 65 66 6f 72 65 20 69 6e 73 |ighty before ins|
000004d0 65 72 74 69 6e 67 20 61 6e 20 65 69 67 68 74 79 |erting an eighty|
000004e0 0d 74 72 61 63 6b 20 64 69 73 63 20 61 6e 64 20 |.track disc and |
000004f0 74 68 65 6e 20 73 77 69 74 63 68 20 62 61 63 6b |then switch back|
00000500 20 74 6f 20 66 6f 72 74 79 20 66 6f 72 20 74 68 | to forty for th|
00000510 65 20 66 6f 72 74 79 20 74 72 61 63 6b 20 64 69 |e forty track di|
00000520 73 63 2e 20 49 66 20 79 6f 75 0d 75 73 65 20 64 |sc. If you.use d|
00000530 75 61 6c 20 73 77 69 74 63 68 61 62 6c 65 20 64 |ual switchable d|
00000540 72 69 76 65 73 20 74 68 69 73 20 63 61 6e 20 62 |rives this can b|
00000550 65 20 61 20 6c 65 73 73 20 65 72 72 6f 72 20 70 |e a less error p|
00000560 72 6f 6e 65 20 6d 65 74 68 6f 64 20 62 65 63 61 |rone method beca|
00000570 75 73 65 0d 79 6f 75 20 77 6f 75 6c 64 20 6e 6f |use.you would no|
00000580 74 20 68 61 76 65 20 74 6f 20 72 65 6d 65 6d 62 |t have to rememb|
00000590 65 72 20 74 6f 20 73 77 69 74 63 68 20 74 68 65 |er to switch the|
000005a0 20 64 72 69 76 65 73 20 62 65 74 77 65 65 6e 20 | drives between |
000005b0 72 65 61 64 69 6e 67 20 61 6e 64 0d 77 72 69 74 |reading and.writ|
000005c0 69 6e 67 2e 20 4f 6e 65 20 70 72 6f 62 6c 65 6d |ing. One problem|
000005d0 20 77 69 74 68 20 74 68 69 73 20 6d 65 74 68 6f | with this metho|
000005e0 64 20 69 73 20 74 68 61 74 2c 20 61 6c 74 68 6f |d is that, altho|
000005f0 75 67 68 20 69 74 20 77 69 6c 6c 20 70 72 6f 64 |ugh it will prod|
00000600 75 63 65 20 61 0d 64 69 73 63 20 77 68 69 63 68 |uce a.disc which|
00000610 20 63 61 6e 20 62 65 20 75 73 65 64 20 6f 6e 20 | can be used on |
00000620 61 6e 20 65 69 67 68 74 79 20 74 72 61 63 6b 20 |an eighty track |
00000630 64 69 73 63 20 64 72 69 76 65 2c 20 69 74 20 77 |disc drive, it w|
00000640 69 6c 6c 20 6f 6e 6c 79 20 75 73 65 0d 66 6f 72 |ill only use.for|
00000650 74 79 20 6f 66 20 74 68 65 20 65 69 67 68 74 79 |ty of the eighty|
00000660 20 74 72 61 63 6b 73 2e 20 54 68 69 73 20 63 6f | tracks. This co|
00000670 75 6c 64 20 62 65 20 6f 76 65 72 63 6f 6d 65 20 |uld be overcome |
00000680 62 79 20 75 73 69 6e 67 20 74 68 65 20 2a 43 4f |by using the *CO|
00000690 50 59 0d 63 6f 6d 6d 61 6e 64 20 61 6e 64 20 73 |PY.command and s|
000006a0 77 69 74 63 68 69 6e 67 20 74 68 65 20 74 72 61 |witching the tra|
000006b0 63 6b 20 64 65 6e 73 69 74 79 20 73 65 6c 65 63 |ck density selec|
000006c0 74 6f 72 20 61 70 70 72 6f 70 72 69 61 74 65 6c |tor appropriatel|
000006d0 79 2e 20 41 0d 70 68 69 6c 6f 73 6f 70 68 69 63 |y. A.philosophic|
000006e0 61 6c 20 70 72 6f 62 6c 65 6d 20 77 69 74 68 20 |al problem with |
000006f0 75 73 69 6e 67 20 65 69 74 68 65 72 20 6f 66 20 |using either of |
00000700 74 68 65 73 65 20 6d 65 74 68 6f 64 73 20 74 6f |these methods to|
00000710 20 6d 61 6b 65 20 74 68 65 0d 63 6f 6e 76 65 72 | make the.conver|
00000720 73 69 6f 6e 20 69 73 20 74 68 61 74 20 74 68 65 |sion is that the|
00000730 20 63 6f 6e 76 65 72 73 69 6f 6e 20 69 74 73 65 | conversion itse|
00000740 6c 66 20 69 73 20 70 6f 69 6e 74 6c 65 73 73 20 |lf is pointless |
00000750 69 66 20 79 6f 75 20 68 61 76 65 0d 73 77 69 74 |if you have.swit|
00000760 63 68 61 62 6c 65 20 64 69 73 63 20 64 72 69 76 |chable disc driv|
00000770 65 73 2e 0d 0d 54 68 65 20 72 65 61 6c 20 70 72 |es...The real pr|
00000780 6f 62 6c 65 6d 20 65 78 69 73 74 73 20 66 6f 72 |oblem exists for|
00000790 20 64 69 73 63 20 75 73 65 72 73 20 77 68 6f 20 | disc users who |
000007a0 68 61 76 65 20 61 20 66 6f 72 74 79 20 74 72 61 |have a forty tra|
000007b0 63 6b 20 64 69 73 63 20 61 6e 64 0d 6f 6e 6c 79 |ck disc and.only|
000007c0 20 6f 6e 65 20 65 69 67 68 74 79 20 74 72 61 63 | one eighty trac|
000007d0 6b 20 64 69 73 63 20 64 72 69 76 65 2e 20 49 6e |k disc drive. In|
000007e0 20 74 68 65 73 65 20 63 69 72 63 75 6d 73 74 61 | these circumsta|
000007f0 6e 63 65 73 20 69 74 20 69 73 20 6e 65 63 65 73 |nces it is neces|
00000800 73 61 72 79 0d 74 6f 20 6d 6f 64 69 66 79 20 74 |sary.to modify t|
00000810 68 65 20 64 69 73 63 20 69 74 73 65 6c 66 20 73 |he disc itself s|
00000820 6f 20 74 68 61 74 20 69 74 20 62 65 63 6f 6d 65 |o that it become|
00000830 73 20 61 6e 20 65 69 67 68 74 79 20 74 72 61 63 |s an eighty trac|
00000840 6b 20 64 69 73 63 2e 20 49 6e 20 74 68 69 73 0d |k disc. In this.|
00000850 6d 6f 64 75 6c 65 20 49 20 77 69 6c 6c 20 64 65 |module I will de|
00000860 6d 6f 6e 73 74 72 61 74 65 20 68 6f 77 20 74 6f |monstrate how to|
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*
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000011d0 20 20 20 20 20 20 20 20 20 20 20 26 30 34 20 2d | &04 -|
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*
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00003ab0 69 7a 65 0d 20 31 39 39 30 20 20 20 20 20 20 20 |ize. 1990 |
00003ac0 20 20 45 51 55 42 20 26 31 30 20 20 20 20 20 20 | EQUB &10 |
00003ad0 5c 20 67 61 70 20 31 20 73 69 7a 65 0d 20 32 30 |\ gap 1 size. 20|
00003ae0 30 30 20 20 20 20 20 20 20 20 20 45 51 55 42 20 |00 EQUB |
00003af0 26 30 30 20 20 20 20 20 20 5c 20 72 65 73 75 6c |&00 \ resul|
00003b00 74 20 62 79 74 65 0d 20 32 30 31 30 20 2e 74 61 |t byte. 2010 .ta|
00003b10 62 6c 65 0d 20 32 30 32 30 20 20 20 20 20 20 20 |ble. 2020 |
00003b20 20 20 45 51 55 44 20 26 30 31 30 30 30 30 30 30 | EQUD &01000000|
00003b30 0d 20 32 30 33 30 20 20 20 20 20 20 20 20 20 45 |. 2030 E|
00003b40 51 55 44 20 26 30 31 30 31 30 30 30 30 0d 20 32 |QUD &01010000. 2|
00003b50 30 34 30 20 20 20 20 20 20 20 20 20 45 51 55 44 |040 EQUD|
00003b60 20 26 30 31 30 32 30 30 30 30 0d 20 32 30 35 30 | &01020000. 2050|
00003b70 20 20 20 20 20 20 20 20 20 45 51 55 44 20 26 30 | EQUD &0|
00003b80 31 30 33 30 30 30 30 0d 20 32 30 36 30 20 20 20 |1030000. 2060 |
00003b90 20 20 20 20 20 20 45 51 55 44 20 26 30 31 30 34 | EQUD &0104|
00003ba0 30 30 30 30 0d 20 32 30 37 30 20 20 20 20 20 20 |0000. 2070 |
00003bb0 20 20 20 45 51 55 44 20 26 30 31 30 35 30 30 30 | EQUD &0105000|
00003bc0 30 0d 20 32 30 38 30 20 20 20 20 20 20 20 20 20 |0. 2080 |
00003bd0 45 51 55 44 20 26 30 31 30 36 30 30 30 30 0d 20 |EQUD &01060000. |
00003be0 32 30 39 30 20 20 20 20 20 20 20 20 20 45 51 55 |2090 EQU|
00003bf0 44 20 26 30 31 30 37 30 30 30 30 0d 20 32 31 30 |D &01070000. 210|
00003c00 30 20 20 20 20 20 20 20 20 20 45 51 55 44 20 26 |0 EQUD &|
00003c10 30 31 30 38 30 30 30 30 0d 20 32 31 31 30 20 20 |01080000. 2110 |
00003c20 20 20 20 20 20 20 20 45 51 55 44 20 26 30 31 30 | EQUD &010|
00003c30 39 30 30 30 30 0d 20 32 31 32 30 20 2e 74 72 61 |90000. 2120 .tra|
00003c40 63 6b 0d 20 32 31 33 30 20 20 20 20 20 20 20 20 |ck. 2130 |
00003c50 20 45 51 55 42 20 26 30 30 20 20 20 20 20 20 5c | EQUB &00 \|
00003c60 20 6c 6f 67 69 63 61 6c 20 74 72 61 63 6b 20 6e | logical track n|
00003c70 75 6d 62 65 72 0d 20 32 31 34 30 20 5d 0d 20 32 |umber. 2140 ]. 2|
00003c80 31 35 30 20 4e 45 58 54 0d 20 32 31 36 30 20 50 |150 NEXT. 2160 P|
00003c90 52 49 4e 54 27 22 50 6c 61 63 65 20 34 30 20 74 |RINT'"Place 40 t|
00003ca0 72 61 63 6b 20 64 69 73 63 20 69 6e 20 38 30 20 |rack disc in 80 |
00003cb0 74 72 61 63 6b 20 64 72 69 76 65 20 30 22 0d 20 |track drive 0". |
00003cc0 32 31 37 30 20 50 52 49 4e 54 22 50 72 65 73 73 |2170 PRINT"Press|
00003cd0 20 53 70 61 63 65 62 61 72 20 74 6f 20 63 6f 6e | Spacebar to con|
00003ce0 76 65 72 74 20 74 6f 20 38 30 20 74 72 61 63 6b |vert to 80 track|
00003cf0 73 22 0d 20 32 31 38 30 20 52 45 50 45 41 54 0d |s". 2180 REPEAT.|
00003d00 20 32 31 39 30 20 55 4e 54 49 4c 20 47 45 54 20 | 2190 UNTIL GET |
00003d10 3d 20 33 32 0d 20 32 32 30 30 20 43 41 4c 4c 20 |= 32. 2200 CALL |
00003d20 6d 63 6f 64 65 0d |mcode.|
00003d26 
02-09-88/T\DFS04.m0
02-09-88/T\DFS04.m1
02-09-88/T\DFS04.m2
02-09-88/T\DFS04.m4
02-09-88/T\DFS04.m5
.