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26-09-88/T\SWR12
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: | 26-09-88/T\SWR12 |
| Read OK: | ✔ |
| File size: | 3D64 bytes |
| Load address: | 0000 |
| Exec address: | FFFFFFFF |
Duplicates
There is 1 duplicate copy of this file in the archive:
- CEEFAX disks » telesoftware4.adl » 15-01-88/T\SWR12
- CEEFAX disks » telesoftware9.adl » 26-09-88/T\SWR12
File contents
Mastering Sideways ROM & RAM - Module 12 - Absolute workspace
-------------------------------------------------------------
Private workspace is exclusive to the rom claiming it. Absolute
workspace can also be claimed by paged roms. Absolute workspace,
unlike private workspace, is a single block of memory which is shared
between all the roms but is only allocated to one rom at a time.
Absolute workspace can be claimed in user memory when it runs from
&E00 to the highest address asked for by any of the roms. The Master
computer can also claim the alternative paged memory absolute
workspace. Claiming and using paged memory absolute workspace will be
explained after dealing with user memory absolute workspace.
In order to claim absolute workspace your SWR interpreter has to
intercept the absolute workspace service call. To demonstrate the
absolute workspace service call load the object code generated by the
program TRACE into SWR and press the Break key (Ctrl+Break on the
Master). A list of service calls similar to the one in figure 12.1
will be printed on the screen. Unless you use a BBC B with an Acorn
6502 Second Processor, Acorn DNFS and sideways ram in socket &0F your
trace will be different from the one in figure 12.1, but in all BBC
computers you will find service call 1, the absolute workspace claim,
somewhere in the list.
A=19 X=0F Y=FF SPOOL/EXEC file closure
A=0F X=0F Y=FF Vectors claimed
A=FF X=0F Y=FF Tube system main init.
A=01 X=0F Y=0E Abs. workspace claim
A=02 X=0F Y=17 Private workspace claim
A=FE X=0F Y=FF Tube system post init.
A=11 X=0F Y=1F Font implode/explode
Acorn TUBE 6502 64K
A=03 X=0F Y=08 Auto-boot
Acorn DFS
A=10 X=0F Y=EE SPOOL/EXEC file closure
A=0F X=0F Y=30 Vectors claimed
A=0A X=0F Y=D4 Claim static workspace
BASIC
>
Figure 12.1 Service call trace after Break
-------------------------------------------
In figure 12.1 you can see that the absolute workspace claim,
service call 1, is made with Y=&0E. This indicates that no absolute
workspace has yet been claimed. If the trace is run from a lower
priority rom than the Acorn DFS rom then service call 1 is made with
Y=&17 indicating that 9 pages of absolute workspace are claimed by the
DFS.
When service call 1 is made the Y register contains the current
upper limit of the absolute workspace. This starts at &0E and each rom
should compare the value in the Y register with the upper limit of
absolute workspace required by the rom and, if necessary, increase it
to the level required by the rom. Your software must never decrement
the Y register when it intercepts either service call 1 or 2.
In order to use the absolute workspace effectively it is necessary
for your SWR program to claim private workspace as well. One reason
for this is that your rom will need to keep a flag indicating whether
or not it has control of the absolute workspace. This flag should be
located in private workspace. It is also a good idea to keep a copy of
any vital data from absolute workspace in private workspace where you
can be sure that it will not be corrupted. If you intend to write SWR
software that uses absolute workspace you should think of the absolute
workspace as a temporary extension to the private workspace and not as
a substitute for private workspace.
When you want your rom to use the absolute workspace it has to issue
service call &0A to inform the other roms of its intention. Service
call &0A is issued by calling Osbyte &8F with X = service type and
Y = argument for service. In this case make X=&0A and Y=&FF. The rom
is then free to use the absolute workspace and the zero page locations
from &B0 to &CF until its interpreter intercepts a service call &0A
issued by another rom. The interpreter must intercept service call &0A
which instructs it to release the absolute workspace to the rom
issuing the call, usually the DFS.
I have not written an example program which uses absolute workspace
but I have included a outline program, ABSOL, which includes all the
coding you need to write your own.
ABSOL intercepts service call 1 to claim absolute workspace, service
call 2 to claim private workspace, sevice call &0A to release absolute
workspace, and service call 4 to recognise the new * command *STATIC.
It uses the one-command interpreter (lines 570-780) used in the
earlier modules of the course.
The example program ABSOL ensures that at least one page of absolute
workspace is available (lines 300-360) and claims one page of private
workspace (lines 410-450). These are the minimum meaningful amounts if
the program is to use absolute workspace.
The program recognises service call &0A (lines 470-500). After
recognising service call &0A the program would have to copy any vital
data from absolute to private workspace and adjust a flag kept in
private workspace to indicate that it no longer had control of the
absolute workspace.
When the interpreter recognises the new command *STATIC it issues
service call &0A (lines 800-830) to inform the other roms that it
intends to use the absolute workspace. When it has control of the
absolute workspace it can also use the zero page locations from &B0 to
&CF, but it must be prepared to give up control of both these zero
page locations and the absolute workspace when the interpreter
intercepts a service call &0A issued by another rom.
Although using absolute workspace is fairly straightforward if you
use this outline program, it is an unnecessary complication if you
really don't need it. You will probably only need to use it if your
program uses large amounts of data for a short time.
10 REM: ABSOL
20 MODE7
30 HIMEM=&3C00
40 DIM save 50
50 diff=&8000-HIMEM
60 address=&70
70 comvec=&F2
80 romnumber=&F4
90 workspace=&DF0
100 gsread=&FFC5
110 osbyte=&FFF4
120 oscli=&FFF7
130 FOR pass = 0 TO 2 STEP 2
140 P%=HIMEM
150 [ OPT pass
160 BRK
170 BRK
180 BRK
190 JMP service+diff
200 OPT FNequb(&82)
210 OPT FNequb((copyright+diff) MOD 256)
220 BRK
230 .title
240 OPT FNequs("STATIC")
250 .copyright
260 BRK
270 OPT FNequs("(C) Gordon Horsington 1987")
280 BRK
290 .service
300 CMP #1
310 BNE trytwo
320 CPY #&0F
330 BCS carryon
340 INY \ claim 1 page of abs. workspace
350 .carryon
360 RTS
370 .trytwo
380 PHA
390 CMP #2
400 BNE tryten
410 TYA
420 STA workspace,X
430 INY \ 256 bytes of private workspace
440 PLA
450 RTS
460 .tryten
470 CMP #&0A
480 BNE tryfour
490 \ Prepare to release
500 \ absolute workspace
510 .enough
520 PLA
530 RTS
540 .tryfour
550 CMP #4
560 BNE enough
570 TXA
580 PHA
590 TYA
600 PHA
610 LDX #&FF
620 .comloop
630 INX
640 LDA title+diff,X
650 BEQ found
660 LDA (comvec),Y
670 INY
680 CMP #ASC(".")
690 BEQ found
700 AND #&DF
710 CMP title+diff,X
720 BEQ comloop
730 PLA
740 TAY
750 PLA
760 TAX
770 PLA
780 RTS
790 .found
800 LDA #&8F
810 LDX #&0A \ service call &0A
820 LDY #&FF
830 JSR osbyte \ Claim absolute workspace
840 \ Use zero page from &B0 to &CF
850 \ and absolute workspace as well
860 \ as private workspace.
870 PLA
880 PLA
890 PLA
900 LDA #0
910 RTS
920 .lastbyte
930 ]
940 NEXT
950 INPUT'"Save filename? : "filename$
960 IF filename$="" END
970 $save="SAVE "+filename$+" "+STR$~(HIMEM)+" "+STR$~(las
tbyte)+" FFFF8000 FFFF8000"
980 X%=save MOD 256
990 Y%=save DIV 256
1000 *OPT1,2
1010 CALL oscli
1020 *OPT1,0
1030 END
1040 DEFFNequb(byte)
1050 ?P%=byte
1060 P%=P%+1
1070 =pass
1080 DEFFNequw(word)
1090 ?P%=word MOD 256
1100 P%?1=word DIV 256
1110 P%=P%+2
1120 =pass
1130 DEFFNequd(double)
1140 !P%=double
1150 P%=P%+4
1160 =pass
1170 DEFFNequs(string$)
1180 $P%=string$
1190 P%=P%+LEN(string$)
1200 =pass
In order to use the alternative paged memory absolute workspace on
the Master computer it is necessary to intercept service call &23
instead of service call 1. Your program must not claim user memory
absolute workspace as well as paged memory absolute workspace.
Paged memory absolute workspace in the Master starts at &C000 and
has an upper limit of &DBFF. The upper limit of the absolute workspace
must not exceed &DBFF under any circumstances.
If you intend to use paged memory absolute workspace the outline
program ABSOL will need to be modified. The interpreter will no longer
need to intercept service calls 1 and 2 but it will need to intercept
service call &23 to claim paged memory absolute workspace and service
calls &24 and &22 to claim paged memory private workspace. Suitable
modifications for ABSOL are shown in figure 12.2
.service
CMP #&23 \ paged absolute workspace claim?
BNE try24 \ branch if no
CPY #&C1 \ is 1 page already available?
BCS carryon \ branch if yes
INY \ claim 1 page of absolute workspace
.carryon
RTS
.try24
CMP #&24 \ paged private workspace claim?
BNE try22 \ branch if no
INY \ request 1 page of private workspace
RTS
.try22
CMP #&22 \ paged private workspace claim?
BNE try10 \ branch if no
PHA \ store accumulator
TYA \ most sig. byte of start address
STA &DF0,X \ store start of private workspace
PLA \ restore accumulator
RTS
.try10
Figure 12.2 Modificatins needed for the Master
----------------------------------------------
In Module 11 I explained how to switch the paged workspace memory in
and out of the main memory map. It is necessary to use the same
techniques described in Module 11 when using paged memory absolute
workspace.
Before attempting to read or write the contents of the paged memory
absolute workspace, the SWR program must first set bit 3 of the paged
memory select register at &FE34 to switch the paged memory into the
main memory map. To set bit 3 of &FE34 load the accumulator with &08
(0000 1000 binary), OR the accumulator with the contents of &FE34 and
store the accumulator in &FE34.
To switch the paged memory absolute workspace out of the main memory
map it is necessary to clear bit 3 of the paged memory select
register. To clear bit 3 of &FE34 load the accumulator with &F7 (1111
0111 binary), AND the accumulator with the contents of &FE34 and store
the accumulator in &FE34. If you use the subroutines illustrated in
figure 12.3 the paged memory can be switched in and out of the main
memory map without altering any of the other bits in the paged memory
select register.
JSR pagein \ switch paged workspace in
LDA &C000 \ Read first byte of absolute workspace
JSR pageout \ switch paged workspace out
.
.
.
.pagein
PHA
LDA #8 \ 0000 1000 binary
ORA &FE34
STA &FE34 \ set bit 3 of &FE34
PLA \ restore accumulator
RTS
.pageout
PHA
LDA #&F7 \ 1111 0111 binary
AND &FE34
STA &FE34 \ clear bit 3 of &FE34
PLA \ restore accumulator
RTS
Figure 12.3 Reading paged absolute workspace on the Master.
-----------------------------------------------------------
Figure 12.3 illustrates how the two subroutines, pagein and pageout,
should be used to switch the paged memory in and out of the main
memory map when reading the contents of the paged memory absolute
workspace in the Master series computers. Unlike private workspace,
absolute workspace always has a fixed start address and can be
addressed directly.
After switching the paged memory into the main memory map you must
be very careful about using MOS subroutines because the bottom 7.25k
of the MOS has been replaced with the paged memory. You would be wise
not to use the MOS at all until it has been restored by calling
pageout.
The "legal" use of service call 1 has been explained above but a
much more common "illegal" use is also made of this service call.
Look again at figure 12.1, the list of service calls issued after
pressing the Break key. Some of these calls, including service call 1,
are always issued on the BBC B when the Break key is pressed and also
when the computer is switched on. (Service call 1 is only issued on
Ctrl-Break on the Master but service call &FE can be used instead
because it is always issued when the Break key is pressed on the
Master computer). Service call 1 or service call &FE can be
intercepted to carry out almost any function required at reset if, and
only if, all the registers are preserved.
Imagine, for example, that you want the video interlace to stay
switched off. Your SWR interpreter could intercept service call 1 (or
&FE), push all the registers on the stack, switch off the interlace,
pull all the registers back off the stack and return control to the
MOS. This idea has been implemented in the program INTLACE.
Load the object code generated by INTLACE into SWR, press the Break
key and select Mode 6. The interlace will remain switched off until
you select Mode 7 or press Ctrl+Break. It will switch back off when
you next select one of the modes 0-6.
This type of illegal use of service call 1 (or &FE) will be used
again in Module 22 when designing the software for auto-booting rom
cartridges is covered. It will be used then to ensure that the rom
cartridge is always the language booted after a soft reset.
10 REM: INTLACE
20 MODE7
30 HIMEM=&3C00
40 DIM save 50
50 diff=&8000-HIMEM
60 osbyte=&FFF4
70 oscli=&FFF7
80 FOR pass = 0 TO 2 STEP 2
90 P%=HIMEM
100 [ OPT pass
110 BRK
120 BRK
130 BRK
140 JMP service+diff
150 OPT FNequb(&82)
160 OPT FNequb((copyright+diff) MOD 256)
170 BRK
180 OPT FNequs("INTERLACE")
190 .copyright
200 BRK
210 OPT FNequs("(C) Gordon Horsington 1987")
220 BRK
230 .service
240 CMP #&FE
250 BEQ autoboot
260 RTS
270 .autoboot
280 PHA
290 TXA
300 PHA
310 TYA
320 PHA
330 LDA #&90
340 LDX #&FF
350 LDY #1
360 JSR osbyte \ *TV255,1
370 PLA
380 TAY
390 PLA
400 TAX
410 PLA
420 RTS
430 .lastbyte
440 ]
450 NEXT
460 INPUT'"Save filename = "filename$
470 IF filename$="" END
480 $save="SAVE "+filename$+" "+STR$~(HIMEM)+" "+STR$~(las
tbyte)+" FFFF8000 FFFF8000"
490 X%=save MOD 256
500 Y%=save DIV 256
510 *OPT1,2
520 CALL oscli
530 *OPT1,0
540 END
550 DEFFNequb(byte)
560 ?P%=byte
570 P%=P%+1
580 =pass
590 DEFFNequw(word)
600 ?P%=word MOD 256
610 P%?1=word DIV 256
620 P%=P%+2
630 =pass
640 DEFFNequd(double)
650 !P%=double
660 P%=P%+4
670 =pass
680 DEFFNequs(string$)
690 $P%=string$
700 P%=P%+LEN(string$)
710 =pass
00000000 4d 61 73 74 65 72 69 6e 67 20 53 69 64 65 77 61 |Mastering Sidewa|
00000010 79 73 20 52 4f 4d 20 26 20 52 41 4d 20 2d 20 4d |ys ROM & RAM - M|
00000020 6f 64 75 6c 65 20 31 32 20 2d 20 41 62 73 6f 6c |odule 12 - Absol|
00000030 75 74 65 20 77 6f 72 6b 73 70 61 63 65 0d 2d 2d |ute workspace.--|
00000040 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00000070 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0d 0d 20 20 50 |-----------.. P|
00000080 72 69 76 61 74 65 20 77 6f 72 6b 73 70 61 63 65 |rivate workspace|
00000090 20 69 73 20 65 78 63 6c 75 73 69 76 65 20 74 6f | is exclusive to|
000000a0 20 74 68 65 20 72 6f 6d 20 63 6c 61 69 6d 69 6e | the rom claimin|
000000b0 67 20 69 74 2e 20 41 62 73 6f 6c 75 74 65 0d 77 |g it. Absolute.w|
000000c0 6f 72 6b 73 70 61 63 65 20 63 61 6e 20 61 6c 73 |orkspace can als|
000000d0 6f 20 62 65 20 63 6c 61 69 6d 65 64 20 62 79 20 |o be claimed by |
000000e0 70 61 67 65 64 20 72 6f 6d 73 2e 20 41 62 73 6f |paged roms. Abso|
000000f0 6c 75 74 65 20 77 6f 72 6b 73 70 61 63 65 2c 0d |lute workspace,.|
00000100 75 6e 6c 69 6b 65 20 70 72 69 76 61 74 65 20 77 |unlike private w|
00000110 6f 72 6b 73 70 61 63 65 2c 20 69 73 20 61 20 73 |orkspace, is a s|
00000120 69 6e 67 6c 65 20 62 6c 6f 63 6b 20 6f 66 20 6d |ingle block of m|
00000130 65 6d 6f 72 79 20 77 68 69 63 68 20 69 73 20 73 |emory which is s|
00000140 68 61 72 65 64 0d 62 65 74 77 65 65 6e 20 61 6c |hared.between al|
00000150 6c 20 74 68 65 20 72 6f 6d 73 20 62 75 74 20 69 |l the roms but i|
00000160 73 20 6f 6e 6c 79 20 61 6c 6c 6f 63 61 74 65 64 |s only allocated|
00000170 20 74 6f 20 6f 6e 65 20 72 6f 6d 20 61 74 20 61 | to one rom at a|
00000180 20 74 69 6d 65 2e 0d 0d 20 20 41 62 73 6f 6c 75 | time... Absolu|
00000190 74 65 20 77 6f 72 6b 73 70 61 63 65 20 63 61 6e |te workspace can|
000001a0 20 62 65 20 63 6c 61 69 6d 65 64 20 69 6e 20 75 | be claimed in u|
000001b0 73 65 72 20 6d 65 6d 6f 72 79 20 77 68 65 6e 20 |ser memory when |
000001c0 69 74 20 72 75 6e 73 20 66 72 6f 6d 0d 26 45 30 |it runs from.&E0|
000001d0 30 20 74 6f 20 74 68 65 20 68 69 67 68 65 73 74 |0 to the highest|
000001e0 20 61 64 64 72 65 73 73 20 61 73 6b 65 64 20 66 | address asked f|
000001f0 6f 72 20 62 79 20 61 6e 79 20 6f 66 20 74 68 65 |or by any of the|
00000200 20 72 6f 6d 73 2e 20 54 68 65 20 4d 61 73 74 65 | roms. The Maste|
00000210 72 0d 63 6f 6d 70 75 74 65 72 20 63 61 6e 20 61 |r.computer can a|
00000220 6c 73 6f 20 63 6c 61 69 6d 20 74 68 65 20 61 6c |lso claim the al|
00000230 74 65 72 6e 61 74 69 76 65 20 70 61 67 65 64 20 |ternative paged |
00000240 6d 65 6d 6f 72 79 20 61 62 73 6f 6c 75 74 65 0d |memory absolute.|
00000250 77 6f 72 6b 73 70 61 63 65 2e 20 43 6c 61 69 6d |workspace. Claim|
00000260 69 6e 67 20 61 6e 64 20 75 73 69 6e 67 20 70 61 |ing and using pa|
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00000280 75 74 65 20 77 6f 72 6b 73 70 61 63 65 20 77 69 |ute workspace wi|
00000290 6c 6c 20 62 65 0d 65 78 70 6c 61 69 6e 65 64 20 |ll be.explained |
000002a0 61 66 74 65 72 20 64 65 61 6c 69 6e 67 20 77 69 |after dealing wi|
000002b0 74 68 20 75 73 65 72 20 6d 65 6d 6f 72 79 20 61 |th user memory a|
000002c0 62 73 6f 6c 75 74 65 20 77 6f 72 6b 73 70 61 63 |bsolute workspac|
000002d0 65 2e 0d 0d 20 20 49 6e 20 6f 72 64 65 72 20 74 |e... In order t|
000002e0 6f 20 63 6c 61 69 6d 20 61 62 73 6f 6c 75 74 65 |o claim absolute|
000002f0 20 77 6f 72 6b 73 70 61 63 65 20 79 6f 75 72 20 | workspace your |
00000300 53 57 52 20 69 6e 74 65 72 70 72 65 74 65 72 20 |SWR interpreter |
00000310 68 61 73 20 74 6f 0d 69 6e 74 65 72 63 65 70 74 |has to.intercept|
00000320 20 74 68 65 20 61 62 73 6f 6c 75 74 65 20 77 6f | the absolute wo|
00000330 72 6b 73 70 61 63 65 20 73 65 72 76 69 63 65 20 |rkspace service |
00000340 63 61 6c 6c 2e 20 54 6f 20 64 65 6d 6f 6e 73 74 |call. To demonst|
00000350 72 61 74 65 20 74 68 65 0d 61 62 73 6f 6c 75 74 |rate the.absolut|
00000360 65 20 77 6f 72 6b 73 70 61 63 65 20 73 65 72 76 |e workspace serv|
00000370 69 63 65 20 63 61 6c 6c 20 6c 6f 61 64 20 74 68 |ice call load th|
00000380 65 20 6f 62 6a 65 63 74 20 63 6f 64 65 20 67 65 |e object code ge|
00000390 6e 65 72 61 74 65 64 20 62 79 20 74 68 65 0d 70 |nerated by the.p|
000003a0 72 6f 67 72 61 6d 20 54 52 41 43 45 20 69 6e 74 |rogram TRACE int|
000003b0 6f 20 53 57 52 20 61 6e 64 20 70 72 65 73 73 20 |o SWR and press |
000003c0 74 68 65 20 42 72 65 61 6b 20 6b 65 79 20 28 43 |the Break key (C|
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00000410 20 6f 6e 65 20 69 6e 20 66 69 67 75 72 65 20 31 | one in figure 1|
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00000430 74 65 64 20 6f 6e 20 74 68 65 20 73 63 72 65 65 |ted on the scree|
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00000450 65 20 61 20 42 42 43 20 42 20 77 69 74 68 20 61 |e a BBC B with a|
00000460 6e 20 41 63 6f 72 6e 0d 36 35 30 32 20 53 65 63 |n Acorn.6502 Sec|
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00000480 63 6f 72 6e 20 44 4e 46 53 20 61 6e 64 20 73 69 |corn DNFS and si|
00000490 64 65 77 61 79 73 20 72 61 6d 20 69 6e 20 73 6f |deways ram in so|
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000004e0 31 2c 20 62 75 74 20 69 6e 20 61 6c 6c 20 42 42 |1, but in all BB|
000004f0 43 0d 63 6f 6d 70 75 74 65 72 73 20 79 6f 75 20 |C.computers you |
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00000530 20 63 6c 61 69 6d 2c 0d 73 6f 6d 65 77 68 65 72 | claim,.somewher|
00000540 65 20 69 6e 20 74 68 65 20 6c 69 73 74 2e 0d 0d |e in the list...|
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00000580 20 58 3d 30 46 20 59 3d 46 46 20 56 65 63 74 6f | X=0F Y=FF Vecto|
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000005a0 20 58 3d 30 46 20 59 3d 46 46 20 54 75 62 65 20 | X=0F Y=FF Tube |
000005b0 73 79 73 74 65 6d 20 6d 61 69 6e 20 69 6e 69 74 |system main init|
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000005d0 45 20 41 62 73 2e 20 77 6f 72 6b 73 70 61 63 65 |E Abs. workspace|
000005e0 20 63 6c 61 69 6d 0d 20 41 3d 30 32 20 58 3d 30 | claim. A=02 X=0|
000005f0 46 20 59 3d 31 37 20 50 72 69 76 61 74 65 20 77 |F Y=17 Private w|
00000600 6f 72 6b 73 70 61 63 65 20 63 6c 61 69 6d 0d 20 |orkspace claim. |
00000610 41 3d 46 45 20 58 3d 30 46 20 59 3d 46 46 20 54 |A=FE X=0F Y=FF T|
00000620 75 62 65 20 73 79 73 74 65 6d 20 70 6f 73 74 20 |ube system post |
00000630 69 6e 69 74 2e 0d 20 41 3d 31 31 20 58 3d 30 46 |init.. A=11 X=0F|
00000640 20 59 3d 31 46 20 46 6f 6e 74 20 69 6d 70 6c 6f | Y=1F Font implo|
00000650 64 65 2f 65 78 70 6c 6f 64 65 0d 0d 41 63 6f 72 |de/explode..Acor|
00000660 6e 20 54 55 42 45 20 36 35 30 32 20 36 34 4b 0d |n TUBE 6502 64K.|
00000670 0d 20 41 3d 30 33 20 58 3d 30 46 20 59 3d 30 38 |. A=03 X=0F Y=08|
00000680 20 41 75 74 6f 2d 62 6f 6f 74 0d 41 63 6f 72 6e | Auto-boot.Acorn|
00000690 20 44 46 53 0d 0d 20 41 3d 31 30 20 58 3d 30 46 | DFS.. A=10 X=0F|
000006a0 20 59 3d 45 45 20 53 50 4f 4f 4c 2f 45 58 45 43 | Y=EE SPOOL/EXEC|
000006b0 20 66 69 6c 65 20 63 6c 6f 73 75 72 65 0d 20 41 | file closure. A|
000006c0 3d 30 46 20 58 3d 30 46 20 59 3d 33 30 20 56 65 |=0F X=0F Y=30 Ve|
000006d0 63 74 6f 72 73 20 63 6c 61 69 6d 65 64 0d 20 41 |ctors claimed. A|
000006e0 3d 30 41 20 58 3d 30 46 20 59 3d 44 34 20 43 6c |=0A X=0F Y=D4 Cl|
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*
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26-09-88/T\SWR12.m1
26-09-88/T\SWR12.m2
26-09-88/T\SWR12.m4
26-09-88/T\SWR12.m5
.