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30-09-88/T\SWR13
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: | 30-09-88/T\SWR13 |
| Read OK: | ✔ |
| File size: | 4FBF bytes |
| Load address: | 0000 |
| Exec address: | FFFFFFFF |
Duplicates
There is 1 duplicate copy of this file in the archive:
- CEEFAX disks » telesoftware5.adl » 22-01-88/T\SWR13
- CEEFAX disks » telesoftware9.adl » 30-09-88/T\SWR13
File contents
Mastering Sideways ROM & RAM - Module 13 - Trapping errors
----------------------------------------------------------
In module 8 you were shown how to deal with user-generated errors
created within your own sideways ram programs. Errors can also be
generated in other sideways roms and it is possible to trap these
errors and process them within your rom image. This is not an easy
task but it can produce some useful and impressive software.
Errors generated in SWR service code are dealt with by copying an
error message, preceded and followed by a BRK instruction, into the
error buffer and then jumping to the BRK instruction preceding the
error message. When the BRK instruction is executed, the MOS issues
service call 6 to all the sideways roms before handing over the error
to the current language. Errors generated in other, lower priority,
roms can be trapped in your SWR program by intercepting service call
6. Ideally your program should be in socket &0F.
The MOS issues service call 6 with the error number pointer (in
locations &FD and &FE) containing the address of the byte after the
BRK instruction and location &F0 containing the value of the stack
pointer after the BRK was executed. Osbyte &BA can be used to find the
number of the rom which was active when the BRK was executed.
There are 2 ways of processing errors after trapping them in your
sideways ram program:
1. Your routine can completely replace the error handler which would
normally deal with the error.
2. Your routine can perform a function or print a message before
handing the error back to the current language's error handling
routine.
In this module I will show you how to design a sideways ram program
to completely replace the normal error handling of the DFS "Cat full"
and "Disc full" errors. The program will be used to copy all the files
from a disc in drive 0 onto as many drive 1 discs as are necessary to
hold them all. This might seem a trivial task but consider what would
happen if drive 0 has a full 80 track disc and drive 1 is a 40 track
drive. Using *COPY 0 1 *.* will eventually create the disc full error
and stop transfering the files before they have all been copied. Using
the same command will create a cat full error if the disc in drive 1
has only one or two catalogue entries unused.
The program FILES instructs the command line interpreter to *COPY
all the files from drive 0 to drive 1. If an error is generated the
program intercepts service call 6 and tests the address stored in the
error number pointer to see if either the cat full or disc full error
has been generated. If it finds either it instructs the user to change
the disc in drive 1 and then continues with the save operation that
generated the error. When all the files have been transfered from
drive 0 to drive 1 the program re-enters BASIC to clear any error
condition that might exist.
After explaining how to design this type of program I will show how
it can be modified to pass control back to the normal error handling
routine.
If you intend to write a program which traps errors by intercepting
service call 6 you need to know the error number of the error you
intend to trap. You can either look the error number up in a manual or
deliberately create the error and then look at a memory dump of the
error buffer and find the error number from there. Figure 13.1 is a
memory dump of the error buffer after creating a cat full and a disc
full error. The error number of each error is stored in the byte after
the first BRK instruction, ie. in location &101. The cat full error
number is &BE and the disc full error number is &C6.
0100 00 BE 43 61 74 20 66 75 ..Cat fu
0108 6C 6C 00 00 00 00 00 00 ll......
0110 00 00 00 00 00 00 00 00 ........
0100 00 C6 44 69 73 6B 20 66 ..Disk f
0108 75 6C 6C 00 00 00 00 00 ull.....
0110 00 00 00 00 00 00 00 00 ........
Figure 13.1 The error buffer after Cat full and Disc full errors.
----------- -----------------------------------------------------
To trap either of these two errors it is necessary for the SWR
interpreter to intercept service call 6 and test the content of the
memory location stored in the error number pointer to see if it
contains either &BE or &C6. If either of these numbers is found the
new error handling routine can process the error, if neither is found
the registers must be restored and control passed back to the MOS.
The purpose of the program is to copy all the files from a disc in
drive 0 onto a disc in drive 1. To do this the program will store data
concerned with the task in its private workspace. The data stored in
private workspace includes a flag which indicates whether or not the
utility is active. If the utility is active the interpreter can trap
and process the cat full and disc full errors. If it is not active the
interpreter must not trap them.
The routine in figure 13.2 is taken from FILES and tests a flag set
up in the last byte of the first page of private workspace. This byte
stores &FF if the utility is active and &00 if it is not. Control will
only pass to the new error handler if the utility is active and if
either the cat full or disc full error has been generated. The flag is
set up when the private workspace is claimed and switched on and off
when the utility starts and finishes.
PHA
CMP #6 \ is it service call 6?
BNE out \ branch if not
TXA \ store all registers
PHA
TYA
PHA
LDX &F4 \ load this rom number
LDA &DF0,X \ find start of workspace
STA &73 \ store high byte of start of workspace
LDA #0 \ workspace always starts at page boundary
STA &72 \ low byte of start of workspace
LDY #&FF \ flag address offset
LDA (&72),Y \ load flag
BEQ noton \ branch if utility not active
INY \ Y=0
LDA (&FD),Y \ load errror number
CMP #&BE \ Cat full error number
BEQ change \ branch if Cat full error
CMP #&C6 \ Disc full error number
BEQ change \ branch if Disc full error
.noton
PLA \ restore all registers
TAY
PLA
TAX
.out
PLA
RTS
.change
Figure 13.2 Checking the utility active flag.
----------- ---------------------------------
As well as a utility active flag there is quite a lot of other data
stored in private workspace. The entire catalogue of drive 0 is stored
and workspace is needed for a command line interpreter buffer and an
Osword parameter block. The program needs to claim two pages of
private workspace to store all these data.
Figure 13.3 is a memory dump of three parts of the two pages of
private workspace claimed by the program FILES. The memory dump was
made while the program FILES was transfering the first file from drive
0 to drive 1. It shows how the private workspace is used by the
program. In the computer in which the memory dump was made, the
private workspace claimed by FILES was in pages &17 and &18. It could
be in any two consecutive pages depending on the workspace claimed by
other roms and the priority of the program FILES.
1700 43 4F 50 59 20 30 20 31 COPY 0 1
1708 20 24 2E 54 52 41 43 45 $.TRACE
1710 20 20 0D 00 00 00 00 00 ......
1780 00 00 18 FF FF 03 53 00 ......S.
1788 00 21 00 00 00 00 00 00 .!......
17F8 00 00 00 00 00 00 00 FF ........
1800 53 57 52 20 53 4F 46 54 SWR SOFT
1808 54 52 41 43 45 20 20 24 TRACE $
1810 4F 53 57 4F 52 44 20 24 OSWORD $
1818 4F 53 42 59 54 45 20 24 OSBYTE $
1820 4F 53 57 44 45 4D 4F 24 OSWDEMO$
Figure 13.3 Parts of a memory dump of private workspace.
----------- --------------------------------------------
The drive 0 catalogue is read using Osword &7F and stored in the
second page of the private workspace (page &18 in this case). The
Osword parameter block starts at &1780. The contents of this buffer
(figure 13.3) indicate a successful read data multi sector from drive
0, track 0, sector 0 with data stored at &FFFF1800.
The command line interpreter buffer starts at &1700. The program
transfers all the files by copying each filename from the drive 0
catalogue (in page &18) into this buffer and then calling the command
line interpreter.
The utility active flag is at &17FF. The contents of this flag in
figure 13.2 indicate that the utility was active when the memory dump
was made.
There are a number of pointers set up in zero page to store the
addresses of the various locations indirectly addressed in the private
workspace. The absolute addresses will depend on the other roms in the
computer but in the computer used to generate figure 13.3 they had the
values shown in figure 13.4.
Name high byte low byte Function
--------------------------------------------------------------------
directory &17 &09 The directory of the current file
private &17 &00 The start of private workspace
catbuff &18 &08 The address of the first filename
clibuff &17 &0B The first byte of the current filename
block &17 &80 The Osword parameter block
Figure 13.4 The zero page pointers.
----------- -----------------------
The SWR interpreter intercepts service call 2 to claim two pages of
private workspace and set up the utility active flag to indicate that
the utility is not yet active (lines 420-570).
The one-command interpreter (lines 1050-1270) is used to recognise
the command *FILES and control is passed to the label ".found" (line
1280). The program is designed to trap errors generated in another rom
and for this reason the stack is balanced before doing anything else
(lines 1290-1310). Errors generated outside your control can play
havoc with the stack and balancing it at this stage minimises the
problems that can be created. The program checks that the DFS is
active (lines 1320-1370) and if all is well prints a "Copy all files -
Go?" message (lines 1500-1520). If the user types a "Y" contol is
passed to the label ".yes" (line 1630).
The zero page pointers (figure 13.4) are set up (lines 1640-1810)
and the utility active flag is set to indicate that errors &BE and &C6
should be trapped (lines 1820-1840). The Osword parameter block
contents are copied into the Osword buffer (lines 1850-1910) and the
most significant byte of the address of the catalogue buffer is also
stored in the Osword buffer (lines 1920-1940). The first part of the
*COPY command is transfered into the command line interpreter buffer
(lines 1950-2010) and the least significant byte of the address of the
first file in the drive 0 catalogue is stored in the zero page pointer
to the command line interpreter buffer (line 2020). The drive 0
catalogue is read and stored in the second page of the private
workspace (lines 2030-2060).
The files are transfered, one at a time, from drive 0 to drive 1.
(lines 2070-2320). Up to 31 files will be copied but if either the cat
full or disc full errors is generated by the DFS the interpreter will
trap the error (lines 610-800) and pass control to the label ".change"
(line 890). The stack is pulled six times to balance it. The stack has
the registers from the SWR interpreter as well as the status register
and return address pushed on when the DFS BRK was executed. These can
all be discarded. The program prompts the user to change the disc in
drive 1 (lines 960-1030) and then returns control to the loop
transfering the files (line 1040 and line 2270).
When all the files have been transfered from drive 0 to drive 1, the
program clears the utility active flag (lines 2340-2360), flushes all
the buffers (lines 2380-2400), finds BASIC (lines 2410-2440) and
enters BASIC (lines 2450-2460) which clears all error conditions.
To modify FILES to pass control back to the normal error handling
routine delete lines 930-950 and 2410-2460. Type the new line 2410.
2410 LDA #0:RTS
The program will perform the same function but report the Disc full or
Cat full error message at the end of the file transfers.
You could also modify the program to use pages &09 and &0A instead
of private workspace. This would make the program shorter and not
raise Oshwm and PAGE but, if you use these pages instead of private
workspace, you can not be sure that your workspace will remain
uncorrupted (see Module 11).
10 REM: FILES
20 MODE7
30 HIMEM=&3C00
40 DIM save 50
50 diff=&8000-HIMEM
60 directory=&70
70 private=directory+2
80 catbuff=directory+4
90 clibuff=directory+6
100 block=directory+8
110 address=directory+10
120 comvec=&F2
130 romnumber=&F4
140 errornum=&FD
150 errstack=&100
160 workspace=&DF0
170 osargs=&FFDA
180 osrdch=&FFE0
190 osasci=&FFE3
200 osnewl=&FFE7
210 osword=&FFF1
220 osbyte=&FFF4
230 oscli=&FFF7
240 FOR pass = 0 TO 2 STEP 2
250 P%=HIMEM
260 [ OPT pass
270 BRK
280 BRK
290 BRK
300 JMP service+diff
310 OPT FNequb(&82)
320 OPT FNequb((copyright+diff) MOD 256)
330 BRK
340 .title
350 OPT FNequs("FILES")
360 .copyright
370 BRK
380 OPT FNequs("(C) Gordon Horsington 1987")
390 BRK
400 .service
410 PHA
420 CMP #2
430 BNE tryfour
440 TYA
450 PHA
460 STA workspace,X
470 LDA #0
480 STA private
490 STY private+1
500 LDY #&FF
510 STA (private),Y \ 0 = utility off
520 PLA
530 TAY
540 INY \ 2 pages of
550 INY \ private workspace
560 PLA
570 RTS
580 .tryfour
590 CMP #4
600 BEQ unrecognised
610 CMP #6
620 BNE out
630 TXA
640 PHA
650 TYA
660 PHA
670 LDX romnumber
680 LDA workspace,X
690 STA private+1
700 LDA #0
710 STA private
720 LDY #&FF
730 LDA (private),Y
740 BEQ noton
750 INY
760 LDA (errornum),Y
770 CMP #&BE \ Cat full
780 BEQ change
790 CMP #&C6 \ Disc full
800 BEQ change
810 .noton
820 PLA
830 TAY
840 PLA
850 TAX
860 .out
870 PLA
880 RTS
890 .change
900 PLA \ Y
910 PLA \ X
920 PLA \ A
930 PLA \ Status register
940 PLA \ Return
950 PLA \ address
960 LDX #(swapdisc+diff) MOD 256
970 LDY #(swapdisc+diff) DIV 256
980 JSR print+diff
990 .spacebar
1000 LDA #&7A
1010 JSR osbyte \ Scan keyboard
1020 CPX #&62
1030 BNE spacebar \ Wait for Space
1040 JMP another+diff
1050 .unrecognised
1060 TXA
1070 PHA
1080 TYA
1090 PHA
1100 LDX #&FF
1110 .comloop
1120 INX
1130 LDA title+diff,X
1140 BEQ found
1150 LDA (comvec),Y
1160 INY
1170 CMP #ASC(".")
1180 BEQ found
1190 AND #&DF
1200 CMP title+diff,X
1210 BEQ comloop
1220 PLA
1230 TAY
1240 PLA
1250 TAX
1260 PLA
1270 RTS
1280 .found
1290 PLA
1300 PLA
1310 PLA
1320 LDA #0
1330 TAX
1340 TAY
1350 JSR osargs
1360 CMP #4 \ Is DFS active?
1370 BEQ dfs
1380 LDA #(wrong+diff) MOD 256
1390 STA address
1400 LDA #(wrong+diff) DIV 256
1410 STA address+1
1420 LDY #&FF
1430 .errorloop
1440 INY
1450 LDA (address),Y
1460 STA errstack,Y
1470 BPL errorloop
1480 JMP errstack
1490 .dfs
1500 LDX #(go+diff) MOD 256
1510 LDY #(go+diff) DIV 256
1520 JSR print+diff
1530 JSR osrdch
1540 AND #&DF
1550 PHA
1560 JSR osasci
1570 JSR osnewl
1580 PLA
1590 CMP #ASC("Y")
1600 BEQ yes
1610 LDA #0
1620 RTS
1630 .yes
1640 JSR osnewl
1650 LDX romnumber
1660 LDA workspace,X
1670 STA block+1
1680 STA clibuff+1
1690 STA private+1
1700 STA directory+1
1710 CLC
1720 ADC #1
1730 STA catbuff+1
1740 LDA #&80
1750 STA block
1760 LDY #8
1770 STY catbuff
1780 INY
1790 STY directory
1800 LDA #0
1810 STA private
1820 LDA #&FF
1830 TAY
1840 STA (private),Y \ &FF = utility on
1850 INY \ Y=0
1860 .dataloop
1870 LDA data+diff,Y
1880 STA (block),Y
1890 INY
1900 CPY #&A
1910 BCC dataloop
1920 LDY #2
1930 LDA catbuff+1
1940 STA (block),Y
1950 LDY #0
1960 .copyloop
1970 LDA copy+diff,Y
1980 STA (private),Y
1990 INY
2000 CPY #&B
2010 BCC copyloop
2020 STY clibuff
2030 LDA #&7F
2040 LDX block
2050 LDY block+1
2060 JSR osword \ Read catalogue
2070 .catalogue
2080 LDY #0
2090 .transfer
2100 LDA (catbuff),Y
2110 STA (clibuff),Y
2120 INY
2130 CPY #7
2140 BCC transfer
2150 LDA #&D
2160 STA (clibuff),Y
2170 LDA (catbuff),Y
2180 AND #&7F
2190 CMP #ASC(" ")
2200 BCC finish
2210 LDY #0
2220 STA (directory),Y
2230 LDA catbuff
2240 CLC
2250 ADC #8
2260 STA catbuff
2270 .another
2280 LDX #0
2290 LDY clibuff+1
2300 JSR oscli
2310 LDA catbuff
2320 BNE catalogue
2330 .finish
2340 LDA #0
2350 LDY #&FF
2360 STA (private),Y \ 0 = utility off
2370 JSR osnewl
2380 LDA #&F
2390 LDX #0
2400 JSR osbyte \ Flush buffers
2410 LDA #&BB
2420 LDX #0
2430 LDY #&FF
2440 JSR osbyte \ Find BASIC
2450 LDA #&8E
2460 JMP osbyte \ Enter BASIC
2470 .print
2480 STX address
2490 STY address+1
2500 LDA #&F
2510 LDX #0
2520 JSR osbyte \ Flush buffers
2530 LDY #0
2540 .printloop
2550 LDA (address),Y
2560 BEQ endprint
2570 JSR osasci
2580 INY
2590 JMP printloop+diff
2600 .endprint
2610 RTS
2620 .data
2630 OPT FNequd(&FF000000)
2640 OPT FNequd(&005303FF)
2650 OPT FNequw(&2100)
2660 .copy
2670 OPT FNequs("COPY 0 1 *.")
2680 .swapdisc
2690 OPT FNequw(&070D)
2700 OPT FNequs("Insert a new disc in ")
2710 OPT FNequb(&3A)
2720 OPT FNequs("1")
2730 OPT FNequb(&0D)
2740 OPT FNequs("and press the Space Bar")
2750 OPT FNequw(&0D0D)
2760 BRK
2770 .go
2780 OPT FNequs("Copy all files from ")
2790 OPT FNequb(&3A)
2800 OPT FNequs("0 to ")
2810 OPT FNequb(&3A)
2820 OPT FNequs("1")
2830 OPT FNequb(&0D)
2840 OPT FNequs("Go (Y/N) ? ")
2850 BRK
2860 .wrong
2870 BRK
2880 BRK
2890 OPT FNequs("DFS not active")
2900 BRK
2910 OPT FNequb(&FF)
2920 .lastbyte
2930 ]
2940 NEXT
2950 INPUT'"Save filename = "filename$
2960 IF filename$="" END
2970 $save="SAVE "+filename$+" "+STR$~(HIMEM)+" "+STR$~(las
tbyte)+" FFFF8000 FFFF8000"
2980 X%=save MOD 256
2990 Y%=save DIV 256
3000 *OPT1,2
3010 CALL oscli
3020 *OPT1,0
3030 END
3040 DEFFNequb(byte)
3050 ?P%=byte
3060 P%=P%+1
3070 =pass
3080 DEFFNequw(word)
3090 ?P%=word MOD 256
3100 P%?1=word DIV 256
3110 P%=P%+2
3120 =pass
3130 DEFFNequd(double)
3140 !P%=double
3150 P%=P%+4
3160 =pass
3170 DEFFNequs(string$)
3180 $P%=string$
3190 P%=P%+LEN(string$)
3200 =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 33 20 2d 20 54 72 61 70 70 |odule 13 - Trapp|
00000030 69 6e 67 20 65 72 72 6f 72 73 0d 2d 2d 2d 2d 2d |ing errors.-----|
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 20 20 49 6e 20 6d 6f 64 75 |-----.. In modu|
00000080 6c 65 20 38 20 79 6f 75 20 77 65 72 65 20 73 68 |le 8 you were sh|
00000090 6f 77 6e 20 68 6f 77 20 74 6f 20 64 65 61 6c 20 |own how to deal |
000000a0 77 69 74 68 20 75 73 65 72 2d 67 65 6e 65 72 61 |with user-genera|
000000b0 74 65 64 20 65 72 72 6f 72 73 0d 63 72 65 61 74 |ted errors.creat|
000000c0 65 64 20 77 69 74 68 69 6e 20 79 6f 75 72 20 6f |ed within your o|
000000d0 77 6e 20 73 69 64 65 77 61 79 73 20 72 61 6d 20 |wn sideways ram |
000000e0 70 72 6f 67 72 61 6d 73 2e 20 45 72 72 6f 72 73 |programs. Errors|
000000f0 20 63 61 6e 20 61 6c 73 6f 20 62 65 0d 67 65 6e | can also be.gen|
00000100 65 72 61 74 65 64 20 69 6e 20 6f 74 68 65 72 20 |erated in other |
00000110 73 69 64 65 77 61 79 73 20 72 6f 6d 73 20 61 6e |sideways roms an|
00000120 64 20 69 74 20 69 73 20 70 6f 73 73 69 62 6c 65 |d it is possible|
00000130 20 74 6f 20 74 72 61 70 20 74 68 65 73 65 0d 65 | to trap these.e|
00000140 72 72 6f 72 73 20 61 6e 64 20 70 72 6f 63 65 73 |rrors and proces|
00000150 73 20 74 68 65 6d 20 77 69 74 68 69 6e 20 79 6f |s them within yo|
00000160 75 72 20 72 6f 6d 20 69 6d 61 67 65 2e 20 54 68 |ur rom image. Th|
00000170 69 73 20 69 73 20 6e 6f 74 20 61 6e 20 65 61 73 |is is not an eas|
00000180 79 0d 74 61 73 6b 20 62 75 74 20 69 74 20 63 61 |y.task but it ca|
00000190 6e 20 70 72 6f 64 75 63 65 20 73 6f 6d 65 20 75 |n produce some u|
000001a0 73 65 66 75 6c 20 61 6e 64 20 69 6d 70 72 65 73 |seful and impres|
000001b0 73 69 76 65 20 73 6f 66 74 77 61 72 65 2e 0d 0d |sive software...|
000001c0 20 20 45 72 72 6f 72 73 20 67 65 6e 65 72 61 74 | Errors generat|
000001d0 65 64 20 69 6e 20 53 57 52 20 73 65 72 76 69 63 |ed in SWR servic|
000001e0 65 20 63 6f 64 65 20 61 72 65 20 64 65 61 6c 74 |e code are dealt|
000001f0 20 77 69 74 68 20 62 79 20 63 6f 70 79 69 6e 67 | with by copying|
00000200 20 61 6e 0d 65 72 72 6f 72 20 6d 65 73 73 61 67 | an.error messag|
00000210 65 2c 20 70 72 65 63 65 64 65 64 20 61 6e 64 20 |e, preceded and |
00000220 66 6f 6c 6c 6f 77 65 64 20 62 79 20 61 20 42 52 |followed by a BR|
00000230 4b 20 69 6e 73 74 72 75 63 74 69 6f 6e 2c 20 69 |K instruction, i|
00000240 6e 74 6f 20 74 68 65 0d 65 72 72 6f 72 20 62 75 |nto the.error bu|
00000250 66 66 65 72 20 61 6e 64 20 74 68 65 6e 20 6a 75 |ffer and then ju|
00000260 6d 70 69 6e 67 20 74 6f 20 74 68 65 20 42 52 4b |mping to the BRK|
00000270 20 69 6e 73 74 72 75 63 74 69 6f 6e 20 70 72 65 | instruction pre|
00000280 63 65 64 69 6e 67 20 74 68 65 0d 65 72 72 6f 72 |ceding the.error|
00000290 20 6d 65 73 73 61 67 65 2e 20 57 68 65 6e 20 74 | message. When t|
000002a0 68 65 20 42 52 4b 20 69 6e 73 74 72 75 63 74 69 |he BRK instructi|
000002b0 6f 6e 20 69 73 20 65 78 65 63 75 74 65 64 2c 20 |on is executed, |
000002c0 74 68 65 20 4d 4f 53 20 69 73 73 75 65 73 0d 73 |the MOS issues.s|
000002d0 65 72 76 69 63 65 20 63 61 6c 6c 20 36 20 74 6f |ervice call 6 to|
000002e0 20 61 6c 6c 20 74 68 65 20 73 69 64 65 77 61 79 | all the sideway|
000002f0 73 20 72 6f 6d 73 20 62 65 66 6f 72 65 20 68 61 |s roms before ha|
00000300 6e 64 69 6e 67 20 6f 76 65 72 20 74 68 65 20 65 |nding over the e|
00000310 72 72 6f 72 0d 74 6f 20 74 68 65 20 63 75 72 72 |rror.to the curr|
00000320 65 6e 74 20 6c 61 6e 67 75 61 67 65 2e 20 45 72 |ent language. Er|
00000330 72 6f 72 73 20 67 65 6e 65 72 61 74 65 64 20 69 |rors generated i|
00000340 6e 20 6f 74 68 65 72 2c 20 6c 6f 77 65 72 20 70 |n other, lower p|
00000350 72 69 6f 72 69 74 79 2c 0d 72 6f 6d 73 20 63 61 |riority,.roms ca|
00000360 6e 20 62 65 20 74 72 61 70 70 65 64 20 69 6e 20 |n be trapped in |
00000370 79 6f 75 72 20 53 57 52 20 70 72 6f 67 72 61 6d |your SWR program|
00000380 20 62 79 20 69 6e 74 65 72 63 65 70 74 69 6e 67 | by intercepting|
00000390 20 73 65 72 76 69 63 65 20 63 61 6c 6c 0d 36 2e | service call.6.|
000003a0 20 49 64 65 61 6c 6c 79 20 79 6f 75 72 20 70 72 | Ideally your pr|
000003b0 6f 67 72 61 6d 20 73 68 6f 75 6c 64 20 62 65 20 |ogram should be |
000003c0 69 6e 20 73 6f 63 6b 65 74 20 26 30 46 2e 0d 0d |in socket &0F...|
000003d0 20 20 54 68 65 20 4d 4f 53 20 69 73 73 75 65 73 | The MOS issues|
000003e0 20 73 65 72 76 69 63 65 20 63 61 6c 6c 20 36 20 | service call 6 |
000003f0 77 69 74 68 20 74 68 65 20 65 72 72 6f 72 20 6e |with the error n|
00000400 75 6d 62 65 72 20 70 6f 69 6e 74 65 72 20 28 69 |umber pointer (i|
00000410 6e 0d 6c 6f 63 61 74 69 6f 6e 73 20 26 46 44 20 |n.locations &FD |
00000420 61 6e 64 20 26 46 45 29 20 63 6f 6e 74 61 69 6e |and &FE) contain|
00000430 69 6e 67 20 74 68 65 20 61 64 64 72 65 73 73 20 |ing the address |
00000440 6f 66 20 74 68 65 20 62 79 74 65 20 61 66 74 65 |of the byte afte|
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*
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000014e0 20 20 20 20 20 20 20 50 48 41 0d 20 20 20 20 20 | PHA. |
000014f0 20 20 20 20 43 4d 50 20 23 36 20 20 20 20 20 20 | CMP #6 |
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00001a10 6e 65 20 69 6e 74 65 72 70 72 65 74 65 72 20 62 |ne interpreter b|
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00001cb0 20 34 46 20 35 30 20 35 39 20 32 30 20 33 30 20 | 4F 50 59 20 30 |
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00001e50 44 20 34 46 20 32 34 20 20 4f 53 57 44 45 4d 4f |D 4F 24 OSWDEMO|
00001e60 24 0d 0d 46 69 67 75 72 65 20 31 33 2e 33 20 20 |$..Figure 13.3 |
00001e70 50 61 72 74 73 20 6f 66 20 61 20 6d 65 6d 6f 72 |Parts of a memor|
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*
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*
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00004810 20 20 20 4c 44 58 20 23 30 0d 20 32 34 33 30 20 | LDX #0. 2430 |
00004820 20 20 20 20 20 20 20 20 4c 44 59 20 23 26 46 46 | LDY #&FF|
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00004940 20 20 20 4c 44 59 20 23 30 0d 20 32 35 34 30 20 | LDY #0. 2540 |
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00004960 20 20 20 20 20 20 20 20 20 4c 44 41 20 28 61 64 | LDA (ad|
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30-09-88/T\SWR13.m0
30-09-88/T\SWR13.m1
30-09-88/T\SWR13.m2
30-09-88/T\SWR13.m4
30-09-88/T\SWR13.m5
.