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16-10-88/T\SWR15
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 » telesoftware10.adl |
| Filename: | 16-10-88/T\SWR15 |
| Read OK: | ✔ |
| File size: | 3A4E bytes |
| Load address: | 0000 |
| Exec address: | FFFFFFFF |
Duplicates
There is 1 duplicate copy of this file in the archive:
- CEEFAX disks » telesoftware10.adl » 16-10-88/T\SWR15
- CEEFAX disks » telesoftware5.adl » 07-02-88/T\SWR15
File contents
Mastering Sideways ROM & RAM - Module 15 - Multi command interpreter
--------------------------------------------------------------------
Up until now, all the modules of the course that have used an
unrecognised * command interpreter to demonstrate a programming
technique have used a one-command interpreter. In this module I will
introduce a multiple command interpreter which can be used to
implement one or more new * commands per SWR bank.
The multiple command interpreter is much more complicated than the
simple one-command version. It includes an optional prefix character
for the commands as well as command shortening with a dot.
Prefixing commands with an optional character is quite a useful
feature to include in your interpreters. Not only does it make your
work look more professional but it is very useful if the command names
you choose for your rom clash with those in a higher priority rom. If,
for example, your rom uses the command *DUMP and it is in a lower
priority rom socket than the DFS rom then the command will always be
intercepted by the DFS before your interpreter has a chance to
recognise it. If you use an optional "X" prefix your rom will get the
opportunity to intercept the command as long as the equivalent *XDUMP
command is ignored by the DFS rom.
Because the interpreter is used to implement more than one command
you can not use the title string in the header as a command name,
although the title string should still be included in the header to
identify the rom image.
The single command name has to be replaced with a multiple command
name table. Each name in the table is followed by a two byte address.
This is the address of the routine associated with the command name.
Each address is stored in the table with the high byte of the address
followed by the low byte. This breaks with the 6502 convention of
storing the low byte first but it is done so that the high byte, which
must have the most significant bit set, can be used as an end of
command name marker as well as part of the address. The byte &FF is
used as a termination character in the command table.
The command table used in the example program is shown in BASIC 2
Assembler in figure 15.1.
.commtable
EQUS "SIREN" \ command string
EQUB siren DIV 256 \ end of command marker & ms byte
EQUB siren MOD 256 \ ls byte
EQUS "HEHE" \ command string
EQUB hehe DIV 256 \ end of command marker & ms byte
EQUB hehe MOD 256 \ ls byte
EQUS "UFO" \ command string
EQUB ufo DIV 256 \ end of command marker & ms byte
EQUB ufo MOD 256 \ ls byte
EQUB &FF \ termination character
Figure 15.1 The new command table.
----------- ----------------------
The interpreter intercepts service call 4 and then compares the
unrecognised command with each command in the command table. If a
match is found the command address is taken from the command table and
stored in two consecutive zero page bytes which are used to make an
indirect jump to the new routine.
The order of the commands in the table is very important. The
longest command name must be at the head of the table and the shortest
at the end. The reason for this is that if two commands such as *RED
and *REDUCE are included in the table and the unrecognised command is
compared with RED before REDUCE then *REDUCE will be recognised as
*RED with the argument "UCE". The commands in the table must all be
upper case alphabetic characters and must not start with the optional
character, in this example "X". Numbers and punctuation characters
must not be used because the unrecognised command is forced to upper
case by ANDing it with #&DF.
The three new routines in the example program SOUNDS are called with
*SIREN, *HEHE, and *UFO. All three routines are the machine code
equivalent of the ENVELOPE and SOUND commands suggested by their
names.
Load the object code generated by SOUNDS into SWR and press the
Break key. The command *HEHE can be shortened to three characters
(*HEH.) but if it is shortened further (*HE.) the command clashes with
the *HELP command. The optional prefix has to be used (*XH.) if you
want to shorten the command to two characters.
The multiple command interpreter intercepts service call 4 (lines
280-310) and pushes the registers (lines 320-360) and two zero page
bytes (lines 370-400) on the stack.
The X register is used as an offset on the command table address and
it is initialised with the value of &FE (line 410). The reason why X
is initialised to &FE, and not zero as you might expect, is that it is
incremented in the outer loop of the comparison routine (line 450) to
point to the byte before the first byte of each command in the table
and again in the inner loop (line 550) to point to every byte of each
command starting with the first byte. The Y register is the offset on
the unrecognised command text pointer and needs to be restored to its
initial value at the begining of each comparison. It is pushed on the
stack as a temporary store (lines 410-420).
The outer loop of the comparison routine is in lines 450 to 700. The
outer loop points to each command in the command table. The X register
is incremented to point to the byte preceding the first byte of each
command (line 450) and the Y register is restored to its initial value
(lines 460-480). The first character of the unrecognised command is
read (line 490) and forced to upper case (line 500). It is compared
with the optional first character (line 510) and if it matches the Y
register is incremented to point to the next character (line 530). If
it does not match the Y register is not incremented so that the first
character will be read again and compared with the contents of the
command table.
The inner loop of the comparison routine is in lines 550 to 640.
This loop compares every byte of each new command with every byte of
the unrecognised command and recognises a command if either all the
pairs of bytes match or if all pairs of bytes match until a dot is
read at the end of the unrecognised command.
The X register is incremented (line 550) to point to the first byte
of a command in the command table. The byte pointed to by the offset
in X is read (line 560) and tested (line 570) to see if it is the end
of command marker (the most significant byte of the address bytes).
When the command name and unrecognised command match the end of
command marker will be read and control is passed to the label
".found". Control is also passed to ".found" when the termination
character (&FF) is read. If the end of command marker or termination
character is not read the next byte in the unrecognised command is
compared with "." (lines 580-600). If the next character is a dot
control is passed to the label ".foundot".
The inner loop in lines 550 to 640 exits when a mismatch in the
pairs of bytes is found. When a mismatch occurs the X register is
pointed to the end of command marker (lines 660-680) and the marker is
compared with &FF to see if it is the command table termination
character (line 690). If the termination character is found the zero
page bytes and registers are restored and control is passed back to
the MOS (lines 720-820). If it is not the routine branches back to the
label ".firstchar" (line 440) to compare the unrecognised command with
the next command in the table.
When a command shortened with a dot is recognised control is passed
to the label ".foundot" (line 830). The X register is then incremented
until it points to the end of command marker (lines 840-860).
An unshortened command passes control to the label ".found" (line
870). The accumulator is compared with &FF to see if the termination
character has been read. If it has then none of the commands match the
unrecognised command and so the registers are restored and control
passes back to the MOS (lines 710-820). If the accumulator does not
contain the termination character it must contain the most significant
byte of the new routine. This is stored in the most significant of the
two consecutive zero page bytes (line 900). The X register is
incremented to point to the byte storing the least significant byte of
the new routine's address (line 910). This byte is loaded into the
accumulator (line 920) and stored in the least significant of the two
zero page bytes (line 930). The Y register was pushed on the stack as
a temporary store and is pulled off and discarded (line 940). The
argument is initialised (lines 950-960) and an indirect jump is made
to the new routine (line 970).
After the new routine has been executed the two zero page bytes used
for the indirect jump are restored (lines 1190-1220), the stack is
balanced (lines 1230-1250), the accumulator is loaded with zero to
indicate that the command has been recognised (line 1260) and control
is passed back to the MOS (line 1270).
Understanding and explaining how the interpreter works is much more
difficult than using it. In order to use this interpreter with your
own programs you only need to add the command names to the command
table and, of course, the new routines. You don't need to alter the
coding of the interpreter at all which makes it very easy to adapt for
your own software. When you adapt your own programs to run in SWR with
this interpreter you must not forget to use a routine, such as the one
in lines 1180 to 1270, which restores the two zero page bytes and
balances the stack before returning control to the MOS. Restoring the
memory used by the interpreter, balancing the stack and loading the
accumulator with zero before returning is absolutely vital. This
multiple command interpreter will not work properly if you leave out
this essential last routine.
This interpreter will be developed further in the next module to
include a *HELP service.
10 REM: SOUNDS
20 MODE7
30 HIMEM=&3C00
40 DIM save 50
50 diff=&8000-HIMEM
60 address=&70
70 comvec=&F2
80 gsinit=&FFC2
90 gsread=&FFC5
100 osword=&FFF1
110 oscli=&FFF7
120 FOR pass = 0 TO 2 STEP 2
130 P%=HIMEM
140 [ OPT pass
150 BRK
160 BRK
170 BRK
180 JMP service+diff
190 OPT FNequb(&82)
200 OPT FNequb((copyright+diff) MOD 256)
210 BRK
220 OPT FNequs("SOUNDS")
230 .copyright
240 BRK
250 OPT FNequs("(C) Gordon Horsington 1987")
260 BRK
270 .service
280 CMP #4
290 BEQ unrecognised
300 RTS
310 .unrecognised
320 PHA
330 TXA
340 PHA
350 TYA
360 PHA
370 LDA address
380 PHA
390 LDA address+1
400 PHA
410 LDX #&FE
420 TYA
430 PHA
440 .firstchar
450 INX
460 PLA
470 TAY
480 PHA
490 LDA (comvec),Y
500 AND #&DF
510 CMP #ASC("X")
520 BNE interpret
530 INY
540 .interpret
550 INX
560 LDA commtable+diff,X
570 BMI found
580 LDA (comvec),Y
590 INY
600 CMP #ASC(".")
610 BEQ founddot
620 AND #&DF
630 CMP commtable+diff,X
640 BEQ interpret
650 .another
660 INX
670 LDA commtable+diff,X
680 BPL another
690 CMP #&FF
700 BNE firstchar
710 .exit
720 PLA
730 PLA
740 STA address+1
750 PLA
760 STA address
770 PLA
780 TAY
790 PLA
800 TAX
810 PLA
820 RTS
830 .founddot
840 INX
850 LDA commtable+diff,X
860 BPL founddot
870 .found
880 CMP #&FF
890 BEQ exit
900 STA address+1
910 INX
920 LDA commtable+diff,X
930 STA address
940 PLA
950 SEC
960 JSR gsinit
970 JMP (address)
980 .commtable
990 OPT FNequs("SIREN")
1000 OPT FNequb((siren+diff) DIV 256)
1010 OPT FNequb((siren+diff) MOD 256)
1020 OPT FNequs("HEHE")
1030 OPT FNequb((hehe+diff) DIV 256)
1040 OPT FNequb((hehe+diff) MOD 256)
1050 OPT FNequs("UFO")
1060 OPT FNequb((ufo+diff) DIV 256)
1070 OPT FNequb((ufo+diff) MOD 256)
1080 OPT FNequb(&FF)
1090 .hehe
1100 LDA #8
1110 LDX #(ehehe+diff) MOD 256
1120 LDY #(ehehe+diff) DIV 256
1130 JSR osword \ Envelope
1140 LDA #7
1150 LDX #(shehe+diff) MOD 256
1160 LDY #(shehe+diff) DIV 256
1170 JSR osword \ Sound
1180 .pullout
1190 PLA
1200 STA address+1
1210 PLA
1220 STA address
1230 PLA
1240 PLA
1250 PLA
1260 LDA #0
1270 RTS
1280 .siren
1290 LDA #8
1300 LDX #(esiren+diff) MOD 256
1310 LDY #(esiren+diff) DIV 256
1320 JSR osword \ Envelope
1330 LDA #7
1340 LDX #(ssiren+diff) MOD 256
1350 LDY #(ssiren+diff) DIV 256
1360 JSR osword \ Sound
1370 JMP pullout+diff
1380 .ufo
1390 LDA #8
1400 LDX #(eufo+diff) MOD 256
1410 LDY #(eufo+diff) DIV 256
1420 JSR osword \ Envelope
1430 LDA #7
1440 LDX #(sufo+diff) MOD 256
1450 LDY #(sufo+diff) DIV 256
1460 JSR osword \ Sound
1470 JMP pullout+diff
1480 .ehehe
1490 OPT FNequd(&02FF0301)
1500 OPT FNequd(&461E1E32)
1510 OPT FNequd(&FFFFFF7F)
1520 OPT FNequw(&7E7E)
1530 .shehe
1540 OPT FNequd(&00010011)
1550 OPT FNequd(&00320075)
1560 .esiren
1570 OPT FNequd(&07F90102)
1580 OPT FNequd(&000A0A00)
1590 OPT FNequd(&8200007E)
1600 OPT FNequw(&7E7E)
1610 .ssiren
1620 OPT FNequd(&00020012)
1630 OPT FNequd(&00FF0088)
1640 .eufo
1650 OPT FNequd(&FF010103)
1660 OPT FNequd(&01080700)
1670 OPT FNequd(&FF00FF03)
1680 OPT FNequw(&7E7E)
1690 .sufo
1700 OPT FNequd(&00030013)
1710 OPT FNequd(&003C0082)
1720 .lastbyte
1730 ]
1740 NEXT
1750 INPUT'"Save filename = "filename$
1760 IF filename$="" END
1770 $save="SAVE "+filename$+" "+STR$~(HIMEM)+" "+STR$~(las
tbyte)+" FFFF8000 FFFF8000"
1780 X%=save MOD 256
1790 Y%=save DIV 256
1800 *OPT1,2
1810 CALL oscli
1820 *OPT1,0
1830 END
1840 DEFFNequb(byte)
1850 ?P%=byte
1860 P%=P%+1
1870 =pass
1880 DEFFNequw(word)
1890 ?P%=word MOD 256
1900 P%?1=word DIV 256
1910 P%=P%+2
1920 =pass
1930 DEFFNequd(double)
1940 !P%=double
1950 P%=P%+4
1960 =pass
1970 DEFFNequs(string$)
1980 $P%=string$
1990 P%=P%+LEN(string$)
2000 =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 35 20 2d 20 4d 75 6c 74 69 |odule 15 - Multi|
00000030 20 63 6f 6d 6d 61 6e 64 20 69 6e 74 65 72 70 72 | command interpr|
00000040 65 74 65 72 0d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |eter.-----------|
00000050 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00000080 2d 2d 2d 2d 2d 2d 2d 2d 2d 0d 0d 0d 20 20 55 70 |---------... Up|
00000090 20 75 6e 74 69 6c 20 6e 6f 77 2c 20 61 6c 6c 20 | until now, all |
000000a0 74 68 65 20 6d 6f 64 75 6c 65 73 20 6f 66 20 74 |the modules of t|
000000b0 68 65 20 63 6f 75 72 73 65 20 74 68 61 74 20 68 |he course that h|
000000c0 61 76 65 20 75 73 65 64 20 61 6e 0d 75 6e 72 65 |ave used an.unre|
000000d0 63 6f 67 6e 69 73 65 64 20 2a 20 63 6f 6d 6d 61 |cognised * comma|
000000e0 6e 64 20 69 6e 74 65 72 70 72 65 74 65 72 20 74 |nd interpreter t|
000000f0 6f 20 64 65 6d 6f 6e 73 74 72 61 74 65 20 61 20 |o demonstrate a |
00000100 70 72 6f 67 72 61 6d 6d 69 6e 67 0d 74 65 63 68 |programming.tech|
00000110 6e 69 71 75 65 20 68 61 76 65 20 75 73 65 64 20 |nique have used |
00000120 61 20 6f 6e 65 2d 63 6f 6d 6d 61 6e 64 20 69 6e |a one-command in|
00000130 74 65 72 70 72 65 74 65 72 2e 20 49 6e 20 74 68 |terpreter. In th|
00000140 69 73 20 6d 6f 64 75 6c 65 20 49 20 77 69 6c 6c |is module I will|
00000150 0d 69 6e 74 72 6f 64 75 63 65 20 61 20 6d 75 6c |.introduce a mul|
00000160 74 69 70 6c 65 20 63 6f 6d 6d 61 6e 64 20 69 6e |tiple command in|
00000170 74 65 72 70 72 65 74 65 72 20 77 68 69 63 68 20 |terpreter which |
00000180 63 61 6e 20 62 65 20 75 73 65 64 20 74 6f 0d 69 |can be used to.i|
00000190 6d 70 6c 65 6d 65 6e 74 20 6f 6e 65 20 6f 72 20 |mplement one or |
000001a0 6d 6f 72 65 20 6e 65 77 20 2a 20 63 6f 6d 6d 61 |more new * comma|
000001b0 6e 64 73 20 70 65 72 20 53 57 52 20 62 61 6e 6b |nds per SWR bank|
000001c0 2e 0d 0d 20 20 54 68 65 20 6d 75 6c 74 69 70 6c |... The multipl|
000001d0 65 20 63 6f 6d 6d 61 6e 64 20 69 6e 74 65 72 70 |e command interp|
000001e0 72 65 74 65 72 20 69 73 20 6d 75 63 68 20 6d 6f |reter is much mo|
000001f0 72 65 20 63 6f 6d 70 6c 69 63 61 74 65 64 20 74 |re complicated t|
00000200 68 61 6e 20 74 68 65 0d 73 69 6d 70 6c 65 20 6f |han the.simple o|
00000210 6e 65 2d 63 6f 6d 6d 61 6e 64 20 76 65 72 73 69 |ne-command versi|
00000220 6f 6e 2e 20 49 74 20 69 6e 63 6c 75 64 65 73 20 |on. It includes |
00000230 61 6e 20 6f 70 74 69 6f 6e 61 6c 20 70 72 65 66 |an optional pref|
00000240 69 78 20 63 68 61 72 61 63 74 65 72 0d 66 6f 72 |ix character.for|
00000250 20 74 68 65 20 63 6f 6d 6d 61 6e 64 73 20 61 73 | the commands as|
00000260 20 77 65 6c 6c 20 61 73 20 63 6f 6d 6d 61 6e 64 | well as command|
00000270 20 73 68 6f 72 74 65 6e 69 6e 67 20 77 69 74 68 | shortening with|
00000280 20 61 20 64 6f 74 2e 0d 0d 20 20 50 72 65 66 69 | a dot... Prefi|
00000290 78 69 6e 67 20 63 6f 6d 6d 61 6e 64 73 20 77 69 |xing commands wi|
000002a0 74 68 20 61 6e 20 6f 70 74 69 6f 6e 61 6c 20 63 |th an optional c|
000002b0 68 61 72 61 63 74 65 72 20 69 73 20 71 75 69 74 |haracter is quit|
000002c0 65 20 61 20 75 73 65 66 75 6c 0d 66 65 61 74 75 |e a useful.featu|
000002d0 72 65 20 74 6f 20 69 6e 63 6c 75 64 65 20 69 6e |re to include in|
000002e0 20 79 6f 75 72 20 69 6e 74 65 72 70 72 65 74 65 | your interprete|
000002f0 72 73 2e 20 4e 6f 74 20 6f 6e 6c 79 20 64 6f 65 |rs. Not only doe|
00000300 73 20 69 74 20 6d 61 6b 65 20 79 6f 75 72 0d 77 |s it make your.w|
00000310 6f 72 6b 20 6c 6f 6f 6b 20 6d 6f 72 65 20 70 72 |ork look more pr|
00000320 6f 66 65 73 73 69 6f 6e 61 6c 20 62 75 74 20 69 |ofessional but i|
00000330 74 20 69 73 20 76 65 72 79 20 75 73 65 66 75 6c |t is very useful|
00000340 20 69 66 20 74 68 65 20 63 6f 6d 6d 61 6e 64 20 | if the command |
00000350 6e 61 6d 65 73 0d 79 6f 75 20 63 68 6f 6f 73 65 |names.you choose|
00000360 20 66 6f 72 20 79 6f 75 72 20 72 6f 6d 20 63 6c | for your rom cl|
00000370 61 73 68 20 77 69 74 68 20 74 68 6f 73 65 20 69 |ash with those i|
00000380 6e 20 61 20 68 69 67 68 65 72 20 70 72 69 6f 72 |n a higher prior|
00000390 69 74 79 20 72 6f 6d 2e 20 49 66 2c 0d 66 6f 72 |ity rom. If,.for|
000003a0 20 65 78 61 6d 70 6c 65 2c 20 79 6f 75 72 20 72 | example, your r|
000003b0 6f 6d 20 75 73 65 73 20 74 68 65 20 63 6f 6d 6d |om uses the comm|
000003c0 61 6e 64 20 2a 44 55 4d 50 20 61 6e 64 20 69 74 |and *DUMP and it|
000003d0 20 69 73 20 69 6e 20 61 20 6c 6f 77 65 72 0d 70 | is in a lower.p|
000003e0 72 69 6f 72 69 74 79 20 72 6f 6d 20 73 6f 63 6b |riority rom sock|
000003f0 65 74 20 74 68 61 6e 20 74 68 65 20 44 46 53 20 |et than the DFS |
00000400 72 6f 6d 20 74 68 65 6e 20 74 68 65 20 63 6f 6d |rom then the com|
00000410 6d 61 6e 64 20 77 69 6c 6c 20 61 6c 77 61 79 73 |mand will always|
00000420 20 62 65 0d 69 6e 74 65 72 63 65 70 74 65 64 20 | be.intercepted |
00000430 62 79 20 74 68 65 20 44 46 53 20 62 65 66 6f 72 |by the DFS befor|
00000440 65 20 79 6f 75 72 20 69 6e 74 65 72 70 72 65 74 |e your interpret|
00000450 65 72 20 68 61 73 20 61 20 63 68 61 6e 63 65 20 |er has a chance |
00000460 74 6f 0d 72 65 63 6f 67 6e 69 73 65 20 69 74 2e |to.recognise it.|
00000470 20 49 66 20 79 6f 75 20 75 73 65 20 61 6e 20 6f | If you use an o|
00000480 70 74 69 6f 6e 61 6c 20 22 58 22 20 70 72 65 66 |ptional "X" pref|
00000490 69 78 20 79 6f 75 72 20 72 6f 6d 20 77 69 6c 6c |ix your rom will|
000004a0 20 67 65 74 20 74 68 65 0d 6f 70 70 6f 72 74 75 | get the.opportu|
000004b0 6e 69 74 79 20 74 6f 20 69 6e 74 65 72 63 65 70 |nity to intercep|
000004c0 74 20 74 68 65 20 63 6f 6d 6d 61 6e 64 20 61 73 |t the command as|
000004d0 20 6c 6f 6e 67 20 61 73 20 74 68 65 20 65 71 75 | long as the equ|
000004e0 69 76 61 6c 65 6e 74 20 2a 58 44 55 4d 50 0d 63 |ivalent *XDUMP.c|
000004f0 6f 6d 6d 61 6e 64 20 69 73 20 69 67 6e 6f 72 65 |ommand is ignore|
00000500 64 20 62 79 20 74 68 65 20 44 46 53 20 72 6f 6d |d by the DFS rom|
00000510 2e 0d 0d 20 20 42 65 63 61 75 73 65 20 74 68 65 |... Because the|
00000520 20 69 6e 74 65 72 70 72 65 74 65 72 20 69 73 20 | interpreter is |
00000530 75 73 65 64 20 74 6f 20 69 6d 70 6c 65 6d 65 6e |used to implemen|
00000540 74 20 6d 6f 72 65 20 74 68 61 6e 20 6f 6e 65 20 |t more than one |
00000550 63 6f 6d 6d 61 6e 64 0d 79 6f 75 20 63 61 6e 20 |command.you can |
00000560 6e 6f 74 20 75 73 65 20 74 68 65 20 74 69 74 6c |not use the titl|
00000570 65 20 73 74 72 69 6e 67 20 69 6e 20 74 68 65 20 |e string in the |
00000580 68 65 61 64 65 72 20 61 73 20 61 20 63 6f 6d 6d |header as a comm|
00000590 61 6e 64 20 6e 61 6d 65 2c 0d 61 6c 74 68 6f 75 |and name,.althou|
000005a0 67 68 20 74 68 65 20 74 69 74 6c 65 20 73 74 72 |gh the title str|
000005b0 69 6e 67 20 73 68 6f 75 6c 64 20 73 74 69 6c 6c |ing should still|
000005c0 20 62 65 20 69 6e 63 6c 75 64 65 64 20 69 6e 20 | be included in |
000005d0 74 68 65 20 68 65 61 64 65 72 20 74 6f 0d 69 64 |the header to.id|
000005e0 65 6e 74 69 66 79 20 74 68 65 20 72 6f 6d 20 69 |entify the rom i|
000005f0 6d 61 67 65 2e 0d 0d 20 20 54 68 65 20 73 69 6e |mage... The sin|
00000600 67 6c 65 20 63 6f 6d 6d 61 6e 64 20 6e 61 6d 65 |gle command name|
00000610 20 68 61 73 20 74 6f 20 62 65 20 72 65 70 6c 61 | has to be repla|
00000620 63 65 64 20 77 69 74 68 20 61 20 6d 75 6c 74 69 |ced with a multi|
00000630 70 6c 65 20 63 6f 6d 6d 61 6e 64 0d 6e 61 6d 65 |ple command.name|
00000640 20 74 61 62 6c 65 2e 20 45 61 63 68 20 6e 61 6d | table. Each nam|
00000650 65 20 69 6e 20 74 68 65 20 74 61 62 6c 65 20 69 |e in the table i|
00000660 73 20 66 6f 6c 6c 6f 77 65 64 20 62 79 20 61 20 |s followed by a |
00000670 74 77 6f 20 62 79 74 65 20 61 64 64 72 65 73 73 |two byte address|
00000680 2e 0d 54 68 69 73 20 69 73 20 74 68 65 20 61 64 |..This is the ad|
00000690 64 72 65 73 73 20 6f 66 20 74 68 65 20 72 6f 75 |dress of the rou|
000006a0 74 69 6e 65 20 61 73 73 6f 63 69 61 74 65 64 20 |tine associated |
000006b0 77 69 74 68 20 74 68 65 20 63 6f 6d 6d 61 6e 64 |with the command|
000006c0 20 6e 61 6d 65 2e 0d 45 61 63 68 20 61 64 64 72 | name..Each addr|
000006d0 65 73 73 20 69 73 20 73 74 6f 72 65 64 20 69 6e |ess is stored in|
000006e0 20 74 68 65 20 74 61 62 6c 65 20 77 69 74 68 20 | the table with |
000006f0 74 68 65 20 68 69 67 68 20 62 79 74 65 20 6f 66 |the high byte of|
00000700 20 74 68 65 20 61 64 64 72 65 73 73 0d 66 6f 6c | the address.fol|
00000710 6c 6f 77 65 64 20 62 79 20 74 68 65 20 6c 6f 77 |lowed by the low|
00000720 20 62 79 74 65 2e 20 54 68 69 73 20 62 72 65 61 | byte. This brea|
00000730 6b 73 20 77 69 74 68 20 74 68 65 20 36 35 30 32 |ks with the 6502|
00000740 20 63 6f 6e 76 65 6e 74 69 6f 6e 20 6f 66 0d 73 | convention of.s|
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000038b0 46 46 46 46 38 30 30 30 22 0d 20 31 37 38 30 20 |FFFF8000". 1780 |
000038c0 58 25 3d 73 61 76 65 20 4d 4f 44 20 32 35 36 0d |X%=save MOD 256.|
000038d0 20 31 37 39 30 20 59 25 3d 73 61 76 65 20 44 49 | 1790 Y%=save DI|
000038e0 56 20 32 35 36 0d 20 31 38 30 30 20 2a 4f 50 54 |V 256. 1800 *OPT|
000038f0 31 2c 32 0d 20 31 38 31 30 20 43 41 4c 4c 20 6f |1,2. 1810 CALL o|
00003900 73 63 6c 69 0d 20 31 38 32 30 20 2a 4f 50 54 31 |scli. 1820 *OPT1|
00003910 2c 30 0d 20 31 38 33 30 20 45 4e 44 0d 20 31 38 |,0. 1830 END. 18|
00003920 34 30 20 44 45 46 46 4e 65 71 75 62 28 62 79 74 |40 DEFFNequb(byt|
00003930 65 29 0d 20 31 38 35 30 20 3f 50 25 3d 62 79 74 |e). 1850 ?P%=byt|
00003940 65 0d 20 31 38 36 30 20 50 25 3d 50 25 2b 31 0d |e. 1860 P%=P%+1.|
00003950 20 31 38 37 30 20 3d 70 61 73 73 0d 20 31 38 38 | 1870 =pass. 188|
00003960 30 20 44 45 46 46 4e 65 71 75 77 28 77 6f 72 64 |0 DEFFNequw(word|
00003970 29 0d 20 31 38 39 30 20 3f 50 25 3d 77 6f 72 64 |). 1890 ?P%=word|
00003980 20 4d 4f 44 20 32 35 36 0d 20 31 39 30 30 20 50 | MOD 256. 1900 P|
00003990 25 3f 31 3d 77 6f 72 64 20 44 49 56 20 32 35 36 |%?1=word DIV 256|
000039a0 0d 20 31 39 31 30 20 50 25 3d 50 25 2b 32 0d 20 |. 1910 P%=P%+2. |
000039b0 31 39 32 30 20 3d 70 61 73 73 0d 20 31 39 33 30 |1920 =pass. 1930|
000039c0 20 44 45 46 46 4e 65 71 75 64 28 64 6f 75 62 6c | DEFFNequd(doubl|
000039d0 65 29 0d 20 31 39 34 30 20 21 50 25 3d 64 6f 75 |e). 1940 !P%=dou|
000039e0 62 6c 65 0d 20 31 39 35 30 20 50 25 3d 50 25 2b |ble. 1950 P%=P%+|
000039f0 34 0d 20 31 39 36 30 20 3d 70 61 73 73 0d 20 31 |4. 1960 =pass. 1|
00003a00 39 37 30 20 44 45 46 46 4e 65 71 75 73 28 73 74 |970 DEFFNequs(st|
00003a10 72 69 6e 67 24 29 0d 20 31 39 38 30 20 24 50 25 |ring$). 1980 $P%|
00003a20 3d 73 74 72 69 6e 67 24 0d 20 31 39 39 30 20 50 |=string$. 1990 P|
00003a30 25 3d 50 25 2b 4c 45 4e 28 73 74 72 69 6e 67 24 |%=P%+LEN(string$|
00003a40 29 0d 20 32 30 30 30 20 3d 70 61 73 73 0d |). 2000 =pass.|
00003a4e 
16-10-88/T\SWR15.m0
16-10-88/T\SWR15.m1
16-10-88/T\SWR15.m2
16-10-88/T\SWR15.m4
16-10-88/T\SWR15.m5
.