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17-02-88/T\SWR16
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 » telesoftware5.adl |
| Filename: | 17-02-88/T\SWR16 |
| Read OK: | ✔ |
| File size: | 3FDF bytes |
| Load address: | 0000 |
| Exec address: | FFFFFFFF |
Duplicates
There is 1 duplicate copy of this file in the archive:
- CEEFAX disks » telesoftware10.adl » 25-10-88/T\SWR16
- CEEFAX disks » telesoftware5.adl » 17-02-88/T\SWR16
File contents
Mastering Sideways ROM & RAM - Module 16 - *HELP
------------------------------------------------
When you type *HELP the MOS responds by issuing service call 9 to
all the active roms. All roms, except BASIC, have the opportunity to
respond to service call 9, the *HELP service call. The way in which a
rom responds to this call usually depends on whether it is a language
or a service rom. There are no hard and fast rules about how an
individual rom should respond to a help request but language roms
usually print the title string from the rom header and service roms
print an identification string followed by the argument to be used to
get extended help.
The response required from a language rom will be covered in the
next module of the course. The interpreter simply needs to intercept
service call 9, make sure that no argument has been typed, and then
print every byte of the title string. This will be demonstrated by the
example program in Module 17.
The response required from a service rom is more elaborate than that
provided by a language rom. It is illustrated in figures 16.1 and 16.2
in which the help service provided by the example program HELP is
shown with the service call trace active in a higher priority rom.
>*HELP
6502 TUBE 1.10
A=09 X=0F Y=05 Help
COLOURED TEXT
COLOURS
OS 1.20
>
Figure 16.1 Simple *HELP with trace active.
----------- -------------------------------
When you type *HELP each active rom is entered with A=9, X=the rom
number, and Y=the offset to the first non-space character after the
*HELP command. This indicates that any argument typed after the *HELP
command is not initialised quite as you would expect it to be by the
Gsinit MOS subroutine. If you intend to write an extended help service
in which the argument can be enclosed in quotation marks, the argument
will first need to be initialised with Gsinit. If you don't feel it is
necessary to include this extra refinement then there is no need to
initialise the argument.
>*HELP COLOURS
6502 TUBE 1.10
A=09 X=0F Y=06 Help
*BLACK
*RED
*GREEN
*YELLOW
*BLUE
*MAGENTA
*CYAN
*WHITE
*BLAWHIT
*REDCYAN
*GREEMAG
*YELLBLU
*BLUYELL
*MAGREEN
*CYANRED
*WHIBLAC
OS 1.20
>
Figure 16.2 *HELP COLOURS with trace active.
----------- --------------------------------
The trace in figure 16.2 shows that the Y register points to the
first character of the argument, as long as the argument is not
enclosed in quotation marks. In spite of this, the example program
still uses Gsinit to initialise the argument to allow the program to
respond to *HELP "COLOURS" as well as to *HELP COLOURS shown in figure
16.2.
The program HELP uses the multiple command interpreter first
introduced in Module 15. I will not explain again how it works but
there is one important feature worth looking at, namely the command
table starting in line 1320. It is quite clear that the new commands
are included in the table with the longest commands at the head and
the shortest commands at the foot of the table. This order must be
maintained if you add new commands to the table.
The text of the two possible responses to the *HELP command have to
be included in the program. The text of the response to *HELP is
labeled ".helpmsg" and starts in line 1820. The extended help message
starts at the label ".helpinfo" in line 1910. The label ".helptitle"
(line 1870) marks the start of the argument used for extended help.
The content of the simple help text starting at ".helpmsg" is
reproduced in figure 16.3. The structure of this text is important to
the proper working of the help interpreter. The string starting at the
label ".helptitle" is terminated with &FF. This argument termination
byte must be included to mark the end of the argument used to request
extended help. Any character with the most significant bit set is
ignored by the print subroutine (lines 2250-2350). The extended help
argument string is compared with any argument typed after *HELP to see
if extended help is required. The zero byte at the end of the simple
help text is used to indicate the end of text to the print subroutine.
.helpmsg
EQUB &0D \ carriage return
EQUS "COLOURED TEXT" \ rom contents
EQUB &0D \ carriage return
EQUS " " \ two spaces
.helptitle
EQUS "COLOURS" \ expected extended help argument
EQUS &FF \ argument termination byte
EQUW &0D \ carriage return
BRK \ end of message
Figure 16.3 The text of the simple help message.
----------- ------------------------------------
The text starting at label ".helpinfo" in line 1910 is printed when
extended help is requested. This text can be up to 255 bytes long and
must end with a zero byte. Any byte with the most significant bit set
is not printed. It is usual to include the syntax of the commands
implemented in the rom in the extended help, but you are free to write
whatever you like. The example program prints the syntax of sixteen
new commands which can be used to change actual colour of the default
text colour in modes 0-6. The default text colour is white in all
modes but you can change it to red with *RED or flashing red-cyan with
*REDCYAN. The program uses the machine code equivalent of the VDU19
command to achieve this effect.
The order of the commands in the extended help message does not have
to be the same as the order in the command table. In the example
program the order reflects the logical order of the sixteen available
colours.
The interpreter in the program HELP pushes the registers and two
zero page bytes on the stack (lines 320-400), intercepts service call
9 (line 430) and initialises the *HELP argument (lines 450-460). The X
register is reset to zero (line 470) ready to be used as an index on
the expected extended help argument. The first byte of the argument is
read (line 480) and, if an argument is present, a branch is made to
the label ".tryextended" (line 490 and line 570). If an argument is
not found the simple help message is printed (lines 500-520) and the
registers and zero page bytes are restored before returning control to
the MOS (line 530 and lines 1060-1160).
The extended help interpreter (lines 540-700) compares every byte of
the typed argument with every byte of the expected argument (lines
540-640) and if a match is found, or a suitable shortened argument is
typed, the extended help message is printed (lines 670-690) before
returning control to the MOS with the registers and zero page bytes
restored (line 700 and lines 1060-1160).
10 REM: HELP
20 MODE7
30 HIMEM=&3C00
40 DIM save 50
50 diff=&8000-HIMEM
60 address=&70
70 comvec=&F2
80 errstack=&100
90 stack=&105
100 gsinit=&FFC2
110 gsread=&FFC5
120 osasci=&FFE3
130 osword=&FFF1
140 osbyte=&FFF4
150 oscli=&FFF7
160 FOR pass = 0 TO 2 STEP 2
170 P%=HIMEM
180 [ OPT pass
190 BRK
200 BRK
210 BRK
220 JMP service+diff
230 OPT FNequb(&82)
240 OPT FNequb((copyright+diff) MOD 256)
250 BRK
260 OPT FNequs("COLOURED TEXT")
270 .copyright
280 BRK
290 OPT FNequs("(C) Gordon Horsington 1987")
300 BRK
310 .service
320 PHA
330 TXA
340 PHA
350 TYA
360 PHA
370 LDA address
380 PHA
390 LDA address+1
400 PHA
410 TSX
420 LDA stack,X
430 CMP #9
440 BNE tryfour
450 SEC
460 JSR gsinit
470 LDX #0
480 JSR gsread
490 BCC tryextended
500 LDX #(helpmsg+diff) MOD 256
510 LDY #(helpmsg+diff) DIV 256
520 JSR printer+diff
530 BEQ quit
540 .helploop
550 INX
560 JSR gsread
570 .tryextended
580 CMP #ASC(".")
590 BEQ okextended
600 AND #&DF
610 CMP helptitle+diff,X
620 BEQ helploop
630 LDA #&FF
640 CMP helptitle+diff,X
650 BNE quit
660 .okextended
670 LDX #(helpinfo+diff) MOD 256
680 LDY #(helpinfo+diff) DIV 256
690 JSR printer+diff
700 BEQ quit
710 .tryfour
720 CMP #4
730 BNE quit
740 LDX #&FE
750 TYA
760 PHA
770 .firstchar
780 INX
790 PLA
800 TAY
810 PHA
820 LDA (comvec),Y
830 AND #&DF
840 CMP #ASC("X")
850 BNE interpret
860 INY
870 .interpret
880 INX
890 LDA commtable+diff,X
900 BMI found
910 LDA (comvec),Y
920 INY
930 CMP #ASC(".")
940 BEQ founddot
950 AND #&DF
960 CMP commtable+diff,X
970 BEQ interpret
980 .another
990 INX
1000 LDA commtable+diff,X
1010 BPL another
1020 CMP #&FF
1030 BNE firstchar
1040 .exit
1050 PLA
1060 .quit
1070 PLA
1080 STA address+1
1090 PLA
1100 STA address
1110 PLA
1120 TAY
1130 PLA
1140 TAX
1150 PLA
1160 RTS
1170 .founddot
1180 INX
1190 LDA commtable+diff,X
1200 BPL founddot
1210 .found
1220 CMP #&FF
1230 BEQ exit
1240 STA address+1
1250 INX
1260 LDA commtable+diff,X
1270 STA address
1280 PLA
1290 SEC
1300 JSR gsinit
1310 JMP (address)
1320 .commtable
1330 OPT FNequs("BLAWHIT")
1340 OPT FNequb((blawhit+diff) DIV 256)
1350 OPT FNequb((blawhit+diff) MOD 256)
1360 OPT FNequs("REDCYAN")
1370 OPT FNequb((redcyan+diff) DIV 256)
1380 OPT FNequb((redcyan+diff) MOD 256)
1390 OPT FNequs("GREEMAG")
1400 OPT FNequb((greemag+diff) DIV 256)
1410 OPT FNequb((greemag+diff) MOD 256)
1420 OPT FNequs("YELLBLU")
1430 OPT FNequb((yellblu+diff) DIV 256)
1440 OPT FNequb((yellblu+diff) MOD 256)
1450 OPT FNequs("BLUYELL")
1460 OPT FNequb((bluyell+diff) DIV 256)
1470 OPT FNequb((bluyell+diff) MOD 256)
1480 OPT FNequs("MAGREEN")
1490 OPT FNequb((magreen+diff) DIV 256)
1500 OPT FNequb((magreen+diff) MOD 256)
1510 OPT FNequs("CYANRED")
1520 OPT FNequb((cyanred+diff) DIV 256)
1530 OPT FNequb((cyanred+diff) MOD 256)
1540 OPT FNequs("WHIBLAC")
1550 OPT FNequb((whiblac+diff) DIV 256)
1560 OPT FNequb((whiblac+diff) MOD 256)
1570 OPT FNequs("MAGENTA")
1580 OPT FNequb((magenta+diff) DIV 256)
1590 OPT FNequb((magenta+diff) MOD 256)
1600 OPT FNequs("YELLOW")
1610 OPT FNequb((yellow+diff) DIV 256)
1620 OPT FNequb((yellow+diff) MOD 256)
1630 OPT FNequs("WHITE")
1640 OPT FNequb((white+diff) DIV 256)
1650 OPT FNequb((white+diff) MOD 256)
1660 OPT FNequs("GREEN")
1670 OPT FNequb((green+diff) DIV 256)
1680 OPT FNequb((green+diff) MOD 256)
1690 OPT FNequs("BLACK")
1700 OPT FNequb((black+diff) DIV 256)
1710 OPT FNequb((black+diff) MOD 256)
1720 OPT FNequs("CYAN")
1730 OPT FNequb((cyan+diff) DIV 256)
1740 OPT FNequb((cyan+diff) MOD 256)
1750 OPT FNequs("BLUE")
1760 OPT FNequb((blue+diff) DIV 256)
1770 OPT FNequb((blue+diff) MOD 256)
1780 OPT FNequs("RED")
1790 OPT FNequb((red+diff) DIV 256)
1800 OPT FNequb((red+diff) MOD 256)
1810 OPT FNequb(&FF)
1820 .helpmsg
1830 OPT FNequb(&0D)
1840 OPT FNequs("COLOURED TEXT")
1850 OPT FNequb(&0D)
1860 OPT FNequw(&2020)
1870 .helptitle
1880 OPT FNequs("COLOURS")
1890 OPT FNequw(&0DFF)
1900 BRK
1910 .helpinfo
1920 OPT FNequw(&200D)
1930 OPT FNequs("*BLACK")
1940 OPT FNequw(&200D)
1950 OPT FNequs("*RED")
1960 OPT FNequw(&200D)
1970 OPT FNequs("*GREEN")
1980 OPT FNequw(&200D)
1990 OPT FNequs("*YELLOW")
2000 OPT FNequw(&200D)
2010 OPT FNequs("*BLUE")
2020 OPT FNequw(&200D)
2030 OPT FNequs("*MAGENTA")
2040 OPT FNequw(&200D)
2050 OPT FNequs("*CYAN")
2060 OPT FNequw(&200D)
2070 OPT FNequs("*WHITE")
2080 OPT FNequw(&200D)
2090 OPT FNequs("*BLAWHIT")
2100 OPT FNequw(&200D)
2110 OPT FNequs("*REDCYAN")
2120 OPT FNequw(&200D)
2130 OPT FNequs("*GREEMAG")
2140 OPT FNequw(&200D)
2150 OPT FNequs("*YELLBLU")
2160 OPT FNequw(&200D)
2170 OPT FNequs("*BLUYELL")
2180 OPT FNequw(&200D)
2190 OPT FNequs("*MAGREEN")
2200 OPT FNequw(&200D)
2210 OPT FNequs("*CYANRED")
2220 OPT FNequw(&200D)
2230 OPT FNequs("*WHIBLAC")
2240 OPT FNequw(&000D)
2250 .printer
2260 STX address
2270 STY address+1
2280 LDY #&FF
2290 .printloop
2300 INY
2310 LDA (address),Y
2320 BEQ endprint
2330 BMI printloop
2340 JSR osasci
2350 JMP printloop+diff
2360 .endprint
2370 RTS
2380 .black
2390 LDA #0
2400 BEQ mode
2410 .red
2420 LDA #1
2430 BNE mode
2440 .green
2450 LDA #2
2460 BNE mode
2470 .yellow
2480 LDA #3
2490 BNE mode
2500 .blue
2510 LDA #4
2520 BNE mode
2530 .magenta
2540 LDA #5
2550 BNE mode
2560 .cyan
2570 LDA #6
2580 BNE mode
2590 .white
2600 LDA #7
2610 BNE mode
2620 .blawhit
2630 LDA #8
2640 BNE mode
2650 .redcyan
2660 LDA #9
2670 BNE mode
2680 .greemag
2690 LDA #10
2700 BNE mode
2710 .yellblu
2720 LDA #11
2730 BNE mode
2740 .bluyell
2750 LDA #12
2760 BNE mode
2770 .magreen
2780 LDA #13
2790 BNE mode
2800 .cyanred
2810 LDA #14
2820 BNE mode
2830 .whiblac
2840 LDA #15
2850 .mode
2860 PHA
2870 LDA #&87
2880 JSR osbyte \ Check screen mode
2890 CPY #7
2900 BNE mode0to6
2910 PLA
2920 LDA #(wrongmode+diff) MOD 256
2930 STA address
2940 LDA #(wrongmode+diff) DIV 256
2950 STA address+1
2960 LDY #&FF
2970 .errorloop
2980 INY
2990 LDA (address),Y
3000 STA errstack,Y
3010 BPL errorloop
3020 PLA
3030 STA address+1
3040 PLA
3050 STA address
3060 JMP errstack
3070 .mode0to6
3080 LDA colours+diff,Y
3090 PHA
3100 LDA #19
3110 JSR osasci
3120 PLA
3130 JSR osasci
3140 PLA
3150 JSR osasci
3160 LDA #0
3170 JSR osasci
3180 JSR osasci
3190 JSR osasci
3200 .pullout
3210 PLA
3220 STA address+1
3230 PLA
3240 STA address
3250 PLA
3260 PLA
3270 PLA
3280 LDA #0
3290 RTS
3300 .colours
3310 OPT FNequd(&01070301)
3320 OPT FNequw(&0301)
3330 OPT FNequb(&01)
3340 .wrongmode
3350 BRK
3360 BRK
3370 OPT FNequs("Modes 0-6 only")
3380 BRK
3390 OPT FNequb(&FF)
3400 .lastbyte
3410 ]
3420 NEXT
3430 INPUT'"Save filename = "filename$
3440 IF filename$="" END
3450 $save="SAVE "+filename$+" "+STR$~(HIMEM)+" "+STR$~(las
tbyte)+" FFFF8000 FFFF8000"
3460 X%=save MOD 256
3470 Y%=save DIV 256
3480 *OPT1,2
3490 CALL oscli
3500 *OPT1,0
3510 END
3520 DEFFNequb(byte)
3530 ?P%=byte
3540 P%=P%+1
3550 =pass
3560 DEFFNequw(word)
3570 ?P%=word MOD 256
3580 P%?1=word DIV 256
3590 P%=P%+2
3600 =pass
3610 DEFFNequd(double)
3620 !P%=double
3630 P%=P%+4
3640 =pass
3650 DEFFNequs(string$)
3660 $P%=string$
3670 P%=P%+LEN(string$)
3680 =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 36 20 2d 20 2a 48 45 4c 50 |odule 16 - *HELP|
00000030 0d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |.---------------|
00000040 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00000060 2d 0d 0d 0d 20 20 57 68 65 6e 20 79 6f 75 20 74 |-... When you t|
00000070 79 70 65 20 2a 48 45 4c 50 20 74 68 65 20 4d 4f |ype *HELP the MO|
00000080 53 20 72 65 73 70 6f 6e 64 73 20 62 79 20 69 73 |S responds by is|
00000090 73 75 69 6e 67 20 73 65 72 76 69 63 65 20 63 61 |suing service ca|
000000a0 6c 6c 20 39 20 74 6f 0d 61 6c 6c 20 74 68 65 20 |ll 9 to.all the |
000000b0 61 63 74 69 76 65 20 72 6f 6d 73 2e 20 41 6c 6c |active roms. All|
000000c0 20 72 6f 6d 73 2c 20 65 78 63 65 70 74 20 42 41 | roms, except BA|
000000d0 53 49 43 2c 20 68 61 76 65 20 74 68 65 20 6f 70 |SIC, have the op|
000000e0 70 6f 72 74 75 6e 69 74 79 20 74 6f 0d 72 65 73 |portunity to.res|
000000f0 70 6f 6e 64 20 74 6f 20 73 65 72 76 69 63 65 20 |pond to service |
00000100 63 61 6c 6c 20 39 2c 20 74 68 65 20 2a 48 45 4c |call 9, the *HEL|
00000110 50 20 73 65 72 76 69 63 65 20 63 61 6c 6c 2e 20 |P service call. |
00000120 54 68 65 20 77 61 79 20 69 6e 20 77 68 69 63 68 |The way in which|
00000130 20 61 0d 72 6f 6d 20 72 65 73 70 6f 6e 64 73 20 | a.rom responds |
00000140 74 6f 20 74 68 69 73 20 63 61 6c 6c 20 75 73 75 |to this call usu|
00000150 61 6c 6c 79 20 64 65 70 65 6e 64 73 20 6f 6e 20 |ally depends on |
00000160 77 68 65 74 68 65 72 20 69 74 20 69 73 20 61 20 |whether it is a |
00000170 6c 61 6e 67 75 61 67 65 0d 6f 72 20 61 20 73 65 |language.or a se|
00000180 72 76 69 63 65 20 72 6f 6d 2e 20 54 68 65 72 65 |rvice rom. There|
00000190 20 61 72 65 20 6e 6f 20 68 61 72 64 20 61 6e 64 | are no hard and|
000001a0 20 66 61 73 74 20 72 75 6c 65 73 20 61 62 6f 75 | fast rules abou|
000001b0 74 20 68 6f 77 20 61 6e 0d 69 6e 64 69 76 69 64 |t how an.individ|
000001c0 75 61 6c 20 72 6f 6d 20 73 68 6f 75 6c 64 20 72 |ual rom should r|
000001d0 65 73 70 6f 6e 64 20 74 6f 20 61 20 68 65 6c 70 |espond to a help|
000001e0 20 72 65 71 75 65 73 74 20 62 75 74 20 6c 61 6e | request but lan|
000001f0 67 75 61 67 65 20 72 6f 6d 73 0d 75 73 75 61 6c |guage roms.usual|
00000200 6c 79 20 70 72 69 6e 74 20 74 68 65 20 74 69 74 |ly print the tit|
00000210 6c 65 20 73 74 72 69 6e 67 20 66 72 6f 6d 20 74 |le string from t|
00000220 68 65 20 72 6f 6d 20 68 65 61 64 65 72 20 61 6e |he rom header an|
00000230 64 20 73 65 72 76 69 63 65 20 72 6f 6d 73 0d 70 |d service roms.p|
00000240 72 69 6e 74 20 61 6e 20 69 64 65 6e 74 69 66 69 |rint an identifi|
00000250 63 61 74 69 6f 6e 20 73 74 72 69 6e 67 20 66 6f |cation string fo|
00000260 6c 6c 6f 77 65 64 20 62 79 20 74 68 65 20 61 72 |llowed by the ar|
00000270 67 75 6d 65 6e 74 20 74 6f 20 62 65 20 75 73 65 |gument to be use|
00000280 64 20 74 6f 0d 67 65 74 20 65 78 74 65 6e 64 65 |d to.get extende|
00000290 64 20 68 65 6c 70 2e 0d 0d 20 20 54 68 65 20 72 |d help... The r|
000002a0 65 73 70 6f 6e 73 65 20 72 65 71 75 69 72 65 64 |esponse required|
000002b0 20 66 72 6f 6d 20 61 20 6c 61 6e 67 75 61 67 65 | from a language|
000002c0 20 72 6f 6d 20 77 69 6c 6c 20 62 65 20 63 6f 76 | rom will be cov|
000002d0 65 72 65 64 20 69 6e 20 74 68 65 0d 6e 65 78 74 |ered in the.next|
000002e0 20 6d 6f 64 75 6c 65 20 6f 66 20 74 68 65 20 63 | module of the c|
000002f0 6f 75 72 73 65 2e 20 54 68 65 20 69 6e 74 65 72 |ourse. The inter|
00000300 70 72 65 74 65 72 20 73 69 6d 70 6c 79 20 6e 65 |preter simply ne|
00000310 65 64 73 20 74 6f 20 69 6e 74 65 72 63 65 70 74 |eds to intercept|
00000320 0d 73 65 72 76 69 63 65 20 63 61 6c 6c 20 39 2c |.service call 9,|
00000330 20 6d 61 6b 65 20 73 75 72 65 20 74 68 61 74 20 | make sure that |
00000340 6e 6f 20 61 72 67 75 6d 65 6e 74 20 68 61 73 20 |no argument has |
00000350 62 65 65 6e 20 74 79 70 65 64 2c 20 61 6e 64 20 |been typed, and |
00000360 74 68 65 6e 0d 70 72 69 6e 74 20 65 76 65 72 79 |then.print every|
00000370 20 62 79 74 65 20 6f 66 20 74 68 65 20 74 69 74 | byte of the tit|
00000380 6c 65 20 73 74 72 69 6e 67 2e 20 54 68 69 73 20 |le string. This |
00000390 77 69 6c 6c 20 62 65 20 64 65 6d 6f 6e 73 74 72 |will be demonstr|
000003a0 61 74 65 64 20 62 79 20 74 68 65 0d 65 78 61 6d |ated by the.exam|
000003b0 70 6c 65 20 70 72 6f 67 72 61 6d 20 69 6e 20 4d |ple program in M|
000003c0 6f 64 75 6c 65 20 31 37 2e 0d 0d 20 20 54 68 65 |odule 17... The|
000003d0 20 72 65 73 70 6f 6e 73 65 20 72 65 71 75 69 72 | response requir|
000003e0 65 64 20 66 72 6f 6d 20 61 20 73 65 72 76 69 63 |ed from a servic|
000003f0 65 20 72 6f 6d 20 69 73 20 6d 6f 72 65 20 65 6c |e rom is more el|
00000400 61 62 6f 72 61 74 65 20 74 68 61 6e 20 74 68 61 |aborate than tha|
00000410 74 0d 70 72 6f 76 69 64 65 64 20 62 79 20 61 20 |t.provided by a |
00000420 6c 61 6e 67 75 61 67 65 20 72 6f 6d 2e 20 49 74 |language rom. It|
00000430 20 69 73 20 69 6c 6c 75 73 74 72 61 74 65 64 20 | is illustrated |
00000440 69 6e 20 66 69 67 75 72 65 73 20 31 36 2e 31 20 |in figures 16.1 |
00000450 61 6e 64 20 31 36 2e 32 0d 69 6e 20 77 68 69 63 |and 16.2.in whic|
00000460 68 20 74 68 65 20 68 65 6c 70 20 73 65 72 76 69 |h the help servi|
00000470 63 65 20 70 72 6f 76 69 64 65 64 20 62 79 20 74 |ce provided by t|
00000480 68 65 20 65 78 61 6d 70 6c 65 20 70 72 6f 67 72 |he example progr|
00000490 61 6d 20 48 45 4c 50 20 69 73 0d 73 68 6f 77 6e |am HELP is.shown|
000004a0 20 77 69 74 68 20 74 68 65 20 73 65 72 76 69 63 | with the servic|
000004b0 65 20 63 61 6c 6c 20 74 72 61 63 65 20 61 63 74 |e call trace act|
000004c0 69 76 65 20 69 6e 20 61 20 68 69 67 68 65 72 20 |ive in a higher |
000004d0 70 72 69 6f 72 69 74 79 20 72 6f 6d 2e 0d 0d 0d |priority rom....|
000004e0 0d 0d 3e 2a 48 45 4c 50 0d 0d 36 35 30 32 20 54 |..>*HELP..6502 T|
000004f0 55 42 45 20 31 2e 31 30 0d 20 41 3d 30 39 20 58 |UBE 1.10. A=09 X|
00000500 3d 30 46 20 59 3d 30 35 20 48 65 6c 70 0d 0d 43 |=0F Y=05 Help..C|
00000510 4f 4c 4f 55 52 45 44 20 54 45 58 54 0d 20 20 43 |OLOURED TEXT. C|
00000520 4f 4c 4f 55 52 53 0d 0d 4f 53 20 31 2e 32 30 0d |OLOURS..OS 1.20.|
00000530 3e 0d 0d 46 69 67 75 72 65 20 31 36 2e 31 20 20 |>..Figure 16.1 |
00000540 53 69 6d 70 6c 65 20 2a 48 45 4c 50 20 77 69 74 |Simple *HELP wit|
00000550 68 20 74 72 61 63 65 20 61 63 74 69 76 65 2e 0d |h trace active..|
00000560 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 20 20 2d 2d 2d |----------- ---|
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000034e0 30 20 20 20 20 20 20 20 20 20 4c 44 41 20 23 30 |0 LDA #0|
000034f0 0d 20 32 34 30 30 20 20 20 20 20 20 20 20 20 42 |. 2400 B|
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000035b0 65 0d 20 32 35 30 30 20 2e 62 6c 75 65 0d 20 32 |e. 2500 .blue. 2|
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00003600 20 20 20 20 20 20 20 4c 44 41 20 23 35 0d 20 32 | LDA #5. 2|
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00003680 32 36 31 30 20 20 20 20 20 20 20 20 20 42 4e 45 |2610 BNE|
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000036a0 77 68 69 74 0d 20 32 36 33 30 20 20 20 20 20 20 |whit. 2630 |
000036b0 20 20 20 4c 44 41 20 23 38 0d 20 32 36 34 30 20 | LDA #8. 2640 |
000036c0 20 20 20 20 20 20 20 20 42 4e 45 20 6d 6f 64 65 | BNE mode|
000036d0 0d 20 32 36 35 30 20 2e 72 65 64 63 79 61 6e 0d |. 2650 .redcyan.|
000036e0 20 32 36 36 30 20 20 20 20 20 20 20 20 20 4c 44 | 2660 LD|
000036f0 41 20 23 39 0d 20 32 36 37 30 20 20 20 20 20 20 |A #9. 2670 |
00003700 20 20 20 42 4e 45 20 6d 6f 64 65 0d 20 32 36 38 | BNE mode. 268|
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00003720 20 20 20 20 20 20 20 20 20 4c 44 41 20 23 31 30 | LDA #10|
00003730 0d 20 32 37 30 30 20 20 20 20 20 20 20 20 20 42 |. 2700 B|
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00003770 33 30 20 20 20 20 20 20 20 20 20 42 4e 45 20 6d |30 BNE m|
00003780 6f 64 65 0d 20 32 37 34 30 20 2e 62 6c 75 79 65 |ode. 2740 .bluye|
00003790 6c 6c 0d 20 32 37 35 30 20 20 20 20 20 20 20 20 |ll. 2750 |
000037a0 20 4c 44 41 20 23 31 32 0d 20 32 37 36 30 20 20 | LDA #12. 2760 |
000037b0 20 20 20 20 20 20 20 42 4e 45 20 6d 6f 64 65 0d | BNE mode.|
000037c0 20 32 37 37 30 20 2e 6d 61 67 72 65 65 6e 0d 20 | 2770 .magreen. |
000037d0 32 37 38 30 20 20 20 20 20 20 20 20 20 4c 44 41 |2780 LDA|
000037e0 20 23 31 33 0d 20 32 37 39 30 20 20 20 20 20 20 | #13. 2790 |
000037f0 20 20 20 42 4e 45 20 6d 6f 64 65 0d 20 32 38 30 | BNE mode. 280|
00003800 30 20 2e 63 79 61 6e 72 65 64 0d 20 32 38 31 30 |0 .cyanred. 2810|
00003810 20 20 20 20 20 20 20 20 20 4c 44 41 20 23 31 34 | LDA #14|
00003820 0d 20 32 38 32 30 20 20 20 20 20 20 20 20 20 42 |. 2820 B|
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00003860 35 30 20 2e 6d 6f 64 65 0d 20 32 38 36 30 20 20 |50 .mode. 2860 |
00003870 20 20 20 20 20 20 20 50 48 41 0d 20 32 38 37 30 | PHA. 2870|
00003880 20 20 20 20 20 20 20 20 20 4c 44 41 20 23 26 38 | LDA #&8|
00003890 37 0d 20 32 38 38 30 20 20 20 20 20 20 20 20 20 |7. 2880 |
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000038d0 43 50 59 20 23 37 0d 20 32 39 30 30 20 20 20 20 |CPY #7. 2900 |
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000038f0 36 0d 20 32 39 31 30 20 20 20 20 20 20 20 20 20 |6. 2910 |
00003900 50 4c 41 0d 20 32 39 32 30 20 20 20 20 20 20 20 |PLA. 2920 |
00003910 20 20 4c 44 41 20 23 28 77 72 6f 6e 67 6d 6f 64 | LDA #(wrongmod|
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00003930 20 32 39 33 30 20 20 20 20 20 20 20 20 20 53 54 | 2930 ST|
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00003970 56 20 32 35 36 0d 20 32 39 35 30 20 20 20 20 20 |V 256. 2950 |
00003980 20 20 20 20 53 54 41 20 61 64 64 72 65 73 73 2b | STA address+|
00003990 31 0d 20 32 39 36 30 20 20 20 20 20 20 20 20 20 |1. 2960 |
000039a0 4c 44 59 20 23 26 46 46 0d 20 32 39 37 30 20 2e |LDY #&FF. 2970 .|
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000039c0 20 20 20 20 20 20 20 20 49 4e 59 0d 20 32 39 39 | INY. 299|
000039d0 30 20 20 20 20 20 20 20 20 20 4c 44 41 20 28 61 |0 LDA (a|
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00003a80 36 30 20 20 20 20 20 20 20 20 20 4a 4d 50 20 65 |60 JMP e|
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00003ab0 20 20 20 20 20 20 4c 44 41 20 63 6f 6c 6f 75 72 | LDA colour|
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00003ad0 20 20 20 20 20 20 20 50 48 41 0d 20 33 31 30 30 | PHA. 3100|
00003ae0 20 20 20 20 20 20 20 20 20 4c 44 41 20 23 31 39 | LDA #19|
00003af0 0d 20 33 31 31 30 20 20 20 20 20 20 20 20 20 4a |. 3110 J|
00003b00 53 52 20 6f 73 61 73 63 69 0d 20 33 31 32 30 20 |SR osasci. 3120 |
00003b10 20 20 20 20 20 20 20 20 50 4c 41 0d 20 33 31 33 | PLA. 313|
00003b20 30 20 20 20 20 20 20 20 20 20 4a 53 52 20 6f 73 |0 JSR os|
00003b30 61 73 63 69 0d 20 33 31 34 30 20 20 20 20 20 20 |asci. 3140 |
00003b40 20 20 20 50 4c 41 0d 20 33 31 35 30 20 20 20 20 | PLA. 3150 |
00003b50 20 20 20 20 20 4a 53 52 20 6f 73 61 73 63 69 0d | JSR osasci.|
00003b60 20 33 31 36 30 20 20 20 20 20 20 20 20 20 4c 44 | 3160 LD|
00003b70 41 20 23 30 0d 20 33 31 37 30 20 20 20 20 20 20 |A #0. 3170 |
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00003b90 31 38 30 20 20 20 20 20 20 20 20 20 4a 53 52 20 |180 JSR |
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00003bb0 20 20 20 20 20 4a 53 52 20 6f 73 61 73 63 69 0d | JSR osasci.|
00003bc0 20 33 32 30 30 20 2e 70 75 6c 6c 6f 75 74 0d 20 | 3200 .pullout. |
00003bd0 33 32 31 30 20 20 20 20 20 20 20 20 20 50 4c 41 |3210 PLA|
00003be0 0d 20 33 32 32 30 20 20 20 20 20 20 20 20 20 53 |. 3220 S|
00003bf0 54 41 20 61 64 64 72 65 73 73 2b 31 0d 20 33 32 |TA address+1. 32|
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00003c30 20 20 20 20 20 20 20 50 4c 41 0d 20 33 32 36 30 | PLA. 3260|
00003c40 20 20 20 20 20 20 20 20 20 50 4c 41 0d 20 33 32 | PLA. 32|
00003c50 37 30 20 20 20 20 20 20 20 20 20 50 4c 41 0d 20 |70 PLA. |
00003c60 33 32 38 30 20 20 20 20 20 20 20 20 20 4c 44 41 |3280 LDA|
00003c70 20 23 30 0d 20 33 32 39 30 20 20 20 20 20 20 20 | #0. 3290 |
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00003cc0 20 20 20 20 20 20 20 4f 50 54 20 46 4e 65 71 75 | OPT FNequ|
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00003ce0 20 20 20 20 20 20 20 4f 50 54 20 46 4e 65 71 75 | OPT FNequ|
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00003d20 20 20 20 20 20 20 20 20 42 52 4b 0d 20 33 33 37 | BRK. 337|
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17-02-88/T\SWR16.m0
17-02-88/T\SWR16.m1
17-02-88/T\SWR16.m2
17-02-88/T\SWR16.m4
17-02-88/T\SWR16.m5
.