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18-11-88/T\SWR20
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: | 18-11-88/T\SWR20 |
| Read OK: | ✔ |
| File size: | 1FD8 bytes |
| Load address: | 0000 |
| Exec address: | FFFFFFFF |
Duplicates
There is 1 duplicate copy of this file in the archive:
- CEEFAX disks » telesoftware10.adl » 18-11-88/T\SWR20
- CEEFAX disks » telesoftware5.adl » 20-03-88/T\SWR20
File contents
Mastering Sideways ROM & RAM - Module 20 - RFS * commands
---------------------------------------------------------
The RFS formatting programs used in the previous modules of the
course have allowed you to store BASIC and machine code programs in
the RFS and to run them in user memory by selecting the RFS and then
either chaining or *RUNning the programs.
It is usually more convenient to run programs from SWR with *
commands. In this module I will demonstrate how to do this using the
familiar one command interpreter in an RFS rom image with a service
entry point. You can adapt the technique and use it with the multiple
command interpreter introduced in Module 15.
When an unrecognised * command is matched with the rom title string
the one command interpreter usually passes control to a new routine
which is executed in SWR and followed by a return to the MOS. It is
not possible to run programs stored in the RFS in this way. Files are
stored in the RFS in a format similar to cassette files and, like
cassette files, they must be loaded into user memory before they can
run. Files can not run in the RFS memory even if they are sideways ram
programs. If you want to store SWR files in the RFS they will have to
be loaded from the RFS into another SWR bank and initialised before
they will run.
To run programs from the RFS with a new * command it is necessary
for the interpreter to recognise the command and then pass control to
a routine which will select the RFS, load the program into user memory
and run the program. If you have the program DEMO stored in the RFS
you could achieve this same objective by typing:
>*BASIC
>*ROM
>CHAIN "DEMO"
The interpreter in the program RFSERV runs the program DEMO by
passing control to a routine which does just what you would do but in
a different order. It first selects the RFS with Osbyte &8D. It then
flushes the keyboard buffer and inserts the string CHAIN "DEMO"
<Return> into the buffer and finally it uses Osbyte &BB to find BASIC
and Osbyte &8E to enter BASIC. When BASIC is entered in this way it
executes the command in the keyboard buffer and, in this example, it
will chain the program DEMO from the active filing system, the RFS.
The coding executed when the new command is recognised is shown in
figure 20.1. The command stored in the string starting at the label
".rfscomm" can be replaced with whatever command, or series of
commands, you need to run your program.
.found
LDA #&8D \ Osbyte &8D
JSR &FFF4 \ *ROM
LDA #&0F \ Osbyte &0F
LDX #0
JSR &FFF4 \ flush all buffers
LDA #&FF \ initialise offset
PHA \ store offset
.keyboard
PLA \ load A with offset
TAX \ offset in X
INX \ increment offset
TXA \ copy offset into A
PHA \ and store
LDY rfscomm,X \ load character
BEQ endkey \ branch if end of text marker
LDA #&8A \ Osbyte &8A
LDX #&0 \ keyboard buffer
JSR &FFF4 \ load character into buffer
JMP keyboard \ go for next character
.endkey
PLA \ balance stack
LDA #&BB \ Osbyte &BB
LDX #0
LDY #&FF
JSR &FFF4 \ find BASIC
LDA #&8E \ Osbyte &8E
JMP &FFF4 \ enter BASIC, no return
.rfscomm
EQUS "CHAIN""DEMO"""
EQUB &0D \ <Return>
BRK \ end of text marker
Figure 20.1 Inserting CHAIN "DEMO" into the keyboard buffer.
----------- ------------------------------------------------
The program RFSERV uses the RFS interpreter (lines 540-880)
introduced in Module 18 and the unrecognised * command interpreter
(lines 290-530) first used in Module 3. When this interpreter matches
an unrecognised command with the rom title string it passes control to
the label ".found" (line 890). It uses the routine in figure 20.1 to
insert the command CHAIN "DEMO" <Return> into the keyboard buffer and
exits the rom image by entering BASIC (lines 1150-1200). There is no
need to balance the stack before entering BASIC in this way because,
as you should know by now, BASIC will reset the stack when it is
initialised. If you want to use this program to run any other program
from the RFS you will obviously have to alter the command string in
lines 1220 to 1240 and the rom title in line 230.
As with all the RFS header programs used to illustrate this course
RFSERV is used to create RFS rom images with RFSGEN and DEMO. Chain
RFSERV from a disc or tape which also contains both these programs.
Load the rom image they create into SWR and press the Break key. Type
*DEMO and press Return and the demonstration program will load into
user memory and run. Module 18 has more detailed instructions on using
the RFS formatting programs if you need them.
10 REM: RFSERV
20 MODE7
30 HIMEM=&3C00
40 diff=&8000-HIMEM
50 H%=HIMEM
60 comvec=&F2
70 romnumber=&F4
80 phrom=&F5
90 rompoint=&F6
100 gsread=&FFC5
110 osbyte=&FFF4
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 .title
230 OPT FNequs("DEMO")
240 .copyright
250 BRK
260 OPT FNequs("(C) Gordon Horsington 1987")
270 BRK
280 .service
290 PHA
300 CMP #4
310 BNE trythirteen
320 TXA
330 PHA
340 TYA
350 PHA
360 LDX #&FF
370 .comloop
380 INX
390 LDA title+diff,X
400 BEQ found
410 LDA (comvec),Y
420 INY
430 CMP #ASC(".")
440 BEQ found
450 AND #&DF
460 CMP title+diff,X
470 BEQ comloop
480 PLA
490 TAY
500 PLA
510 TAX
520 PLA
530 RTS
540 .trythirteen
550 CMP #13
560 BNE fourteen
570 TYA
580 EOR #&F
590 CMP romnumber
600 BCC out
610 LDA #(lastbyte+diff) MOD 256
620 STA rompoint
630 LDA #(lastbyte+diff) DIV 256
640 STA rompoint+1
650 LDA romnumber
660 EOR #&F
670 STA phrom
680 .exit
690 PLA
700 LDA #0
710 RTS
720 .fourteen
730 CMP #14
740 BNE out
750 LDA phrom
760 EOR #&F
770 CMP romnumber
780 BNE out
790 LDY #0
800 LDA (rompoint),Y
810 TAY
820 INC rompoint
830 BNE exit
840 INC rompoint+1
850 JMP exit+diff
860 .out
870 PLA
880 RTS
890 .found
900 LDA #&8D
910 JSR osbyte \ *ROM
920 LDA #&8B
930 LDX #1
940 LDY #0
950 JSR osbyte \ *OPT1,0
960 LDA #&0F
970 LDX #0
980 JSR osbyte \ Flush all buffers
990 LDA #&FF
1000 PHA
1010 .keyboard
1020 PLA
1030 TAX
1040 INX
1050 TXA
1060 PHA
1070 LDY rfscomm+diff,X
1080 BEQ endkey
1090 LDA #&8A
1100 LDX #0
1110 JSR osbyte
1120 JMP keyboard+diff
1130 .endkey
1140 PLA
1150 LDA #&BB
1160 LDX #0
1170 LDY #&FF
1180 JSR osbyte \ Find BASIC
1190 LDA #&8E
1200 JMP osbyte \ Enter BASIC
1210 .rfscomm
1220 OPT FNequs("CHAIN""DEMO""")
1230 OPT FNequb(&0D)
1240 BRK
1250 .lastbyte
1260 ]
1270 NEXT
1280 O%=lastbyte
1290 CHAIN"RFSGEN"
1300 DEFFNequb(byte)
1310 ?P%=byte
1320 P%=P%+1
1330 =pass
1340 DEFFNequw(word)
1350 ?P%=word MOD 256
1360 P%?1=word DIV 256
1370 P%=P%+2
1380 =pass
1390 DEFFNequd(double)
1400 !P%=double
1410 P%=P%+4
1420 =pass
1430 DEFFNequs(string$)
1440 $P%=string$
1450 P%=P%+LEN(string$)
1460 =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 32 30 20 2d 20 52 46 53 20 2a |odule 20 - RFS *|
00000030 20 63 6f 6d 6d 61 6e 64 73 0d 2d 2d 2d 2d 2d 2d | commands.------|
00000040 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00000070 2d 2d 2d 0d 0d 20 20 54 68 65 20 52 46 53 20 66 |---.. The RFS f|
00000080 6f 72 6d 61 74 74 69 6e 67 20 70 72 6f 67 72 61 |ormatting progra|
00000090 6d 73 20 75 73 65 64 20 69 6e 20 74 68 65 20 70 |ms used in the p|
000000a0 72 65 76 69 6f 75 73 20 6d 6f 64 75 6c 65 73 20 |revious modules |
000000b0 6f 66 20 74 68 65 0d 63 6f 75 72 73 65 20 68 61 |of the.course ha|
000000c0 76 65 20 61 6c 6c 6f 77 65 64 20 79 6f 75 20 74 |ve allowed you t|
000000d0 6f 20 73 74 6f 72 65 20 42 41 53 49 43 20 61 6e |o store BASIC an|
000000e0 64 20 6d 61 63 68 69 6e 65 20 63 6f 64 65 20 70 |d machine code p|
000000f0 72 6f 67 72 61 6d 73 20 69 6e 0d 74 68 65 20 52 |rograms in.the R|
00000100 46 53 20 61 6e 64 20 74 6f 20 72 75 6e 20 74 68 |FS and to run th|
00000110 65 6d 20 69 6e 20 75 73 65 72 20 6d 65 6d 6f 72 |em in user memor|
00000120 79 20 62 79 20 73 65 6c 65 63 74 69 6e 67 20 74 |y by selecting t|
00000130 68 65 20 52 46 53 20 61 6e 64 20 74 68 65 6e 0d |he RFS and then.|
00000140 65 69 74 68 65 72 20 63 68 61 69 6e 69 6e 67 20 |either chaining |
00000150 6f 72 20 2a 52 55 4e 6e 69 6e 67 20 74 68 65 20 |or *RUNning the |
00000160 70 72 6f 67 72 61 6d 73 2e 0d 0d 20 20 49 74 20 |programs... It |
00000170 69 73 20 75 73 75 61 6c 6c 79 20 6d 6f 72 65 20 |is usually more |
00000180 63 6f 6e 76 65 6e 69 65 6e 74 20 74 6f 20 72 75 |convenient to ru|
00000190 6e 20 70 72 6f 67 72 61 6d 73 20 66 72 6f 6d 20 |n programs from |
000001a0 53 57 52 20 77 69 74 68 20 2a 0d 63 6f 6d 6d 61 |SWR with *.comma|
000001b0 6e 64 73 2e 20 49 6e 20 74 68 69 73 20 6d 6f 64 |nds. In this mod|
000001c0 75 6c 65 20 49 20 77 69 6c 6c 20 64 65 6d 6f 6e |ule I will demon|
000001d0 73 74 72 61 74 65 20 68 6f 77 20 74 6f 20 64 6f |strate how to do|
000001e0 20 74 68 69 73 20 75 73 69 6e 67 20 74 68 65 0d | this using the.|
000001f0 66 61 6d 69 6c 69 61 72 20 6f 6e 65 20 63 6f 6d |familiar one com|
00000200 6d 61 6e 64 20 69 6e 74 65 72 70 72 65 74 65 72 |mand interpreter|
00000210 20 69 6e 20 61 6e 20 52 46 53 20 72 6f 6d 20 69 | in an RFS rom i|
00000220 6d 61 67 65 20 77 69 74 68 20 61 20 73 65 72 76 |mage with a serv|
00000230 69 63 65 0d 65 6e 74 72 79 20 70 6f 69 6e 74 2e |ice.entry point.|
00000240 20 59 6f 75 20 63 61 6e 20 61 64 61 70 74 20 74 | You can adapt t|
00000250 68 65 20 74 65 63 68 6e 69 71 75 65 20 61 6e 64 |he technique and|
00000260 20 75 73 65 20 69 74 20 77 69 74 68 20 74 68 65 | use it with the|
00000270 20 6d 75 6c 74 69 70 6c 65 0d 63 6f 6d 6d 61 6e | multiple.comman|
00000280 64 20 69 6e 74 65 72 70 72 65 74 65 72 20 69 6e |d interpreter in|
00000290 74 72 6f 64 75 63 65 64 20 69 6e 20 4d 6f 64 75 |troduced in Modu|
000002a0 6c 65 20 31 35 2e 0d 0d 20 20 57 68 65 6e 20 61 |le 15... When a|
000002b0 6e 20 75 6e 72 65 63 6f 67 6e 69 73 65 64 20 2a |n unrecognised *|
000002c0 20 63 6f 6d 6d 61 6e 64 20 69 73 20 6d 61 74 63 | command is matc|
000002d0 68 65 64 20 77 69 74 68 20 74 68 65 20 72 6f 6d |hed with the rom|
000002e0 20 74 69 74 6c 65 20 73 74 72 69 6e 67 0d 74 68 | title string.th|
000002f0 65 20 6f 6e 65 20 63 6f 6d 6d 61 6e 64 20 69 6e |e one command in|
00000300 74 65 72 70 72 65 74 65 72 20 75 73 75 61 6c 6c |terpreter usuall|
00000310 79 20 70 61 73 73 65 73 20 63 6f 6e 74 72 6f 6c |y passes control|
00000320 20 74 6f 20 61 20 6e 65 77 20 72 6f 75 74 69 6e | to a new routin|
00000330 65 0d 77 68 69 63 68 20 69 73 20 65 78 65 63 75 |e.which is execu|
00000340 74 65 64 20 69 6e 20 53 57 52 20 61 6e 64 20 66 |ted in SWR and f|
00000350 6f 6c 6c 6f 77 65 64 20 62 79 20 61 20 72 65 74 |ollowed by a ret|
00000360 75 72 6e 20 74 6f 20 74 68 65 20 4d 4f 53 2e 20 |urn to the MOS. |
00000370 49 74 20 69 73 0d 6e 6f 74 20 70 6f 73 73 69 62 |It is.not possib|
00000380 6c 65 20 74 6f 20 72 75 6e 20 70 72 6f 67 72 61 |le to run progra|
00000390 6d 73 20 73 74 6f 72 65 64 20 69 6e 20 74 68 65 |ms stored in the|
000003a0 20 52 46 53 20 69 6e 20 74 68 69 73 20 77 61 79 | RFS in this way|
000003b0 2e 20 46 69 6c 65 73 20 61 72 65 0d 73 74 6f 72 |. Files are.stor|
000003c0 65 64 20 69 6e 20 74 68 65 20 52 46 53 20 69 6e |ed in the RFS in|
000003d0 20 61 20 66 6f 72 6d 61 74 20 73 69 6d 69 6c 61 | a format simila|
000003e0 72 20 74 6f 20 63 61 73 73 65 74 74 65 20 66 69 |r to cassette fi|
000003f0 6c 65 73 20 61 6e 64 2c 20 6c 69 6b 65 0d 63 61 |les and, like.ca|
00000400 73 73 65 74 74 65 20 66 69 6c 65 73 2c 20 74 68 |ssette files, th|
00000410 65 79 20 6d 75 73 74 20 62 65 20 6c 6f 61 64 65 |ey must be loade|
00000420 64 20 69 6e 74 6f 20 75 73 65 72 20 6d 65 6d 6f |d into user memo|
00000430 72 79 20 62 65 66 6f 72 65 20 74 68 65 79 20 63 |ry before they c|
00000440 61 6e 0d 72 75 6e 2e 20 46 69 6c 65 73 20 63 61 |an.run. Files ca|
00000450 6e 20 6e 6f 74 20 72 75 6e 20 69 6e 20 74 68 65 |n not run in the|
00000460 20 52 46 53 20 6d 65 6d 6f 72 79 20 65 76 65 6e | RFS memory even|
00000470 20 69 66 20 74 68 65 79 20 61 72 65 20 73 69 64 | if they are sid|
00000480 65 77 61 79 73 20 72 61 6d 0d 70 72 6f 67 72 61 |eways ram.progra|
00000490 6d 73 2e 20 49 66 20 79 6f 75 20 77 61 6e 74 20 |ms. If you want |
000004a0 74 6f 20 73 74 6f 72 65 20 53 57 52 20 66 69 6c |to store SWR fil|
000004b0 65 73 20 69 6e 20 74 68 65 20 52 46 53 20 74 68 |es in the RFS th|
000004c0 65 79 20 77 69 6c 6c 20 68 61 76 65 20 74 6f 0d |ey will have to.|
000004d0 62 65 20 6c 6f 61 64 65 64 20 66 72 6f 6d 20 74 |be loaded from t|
000004e0 68 65 20 52 46 53 20 69 6e 74 6f 20 61 6e 6f 74 |he RFS into anot|
000004f0 68 65 72 20 53 57 52 20 62 61 6e 6b 20 61 6e 64 |her SWR bank and|
00000500 20 69 6e 69 74 69 61 6c 69 73 65 64 20 62 65 66 | initialised bef|
00000510 6f 72 65 0d 74 68 65 79 20 77 69 6c 6c 20 72 75 |ore.they will ru|
00000520 6e 2e 0d 0d 20 20 54 6f 20 72 75 6e 20 70 72 6f |n... To run pro|
00000530 67 72 61 6d 73 20 66 72 6f 6d 20 74 68 65 20 52 |grams from the R|
00000540 46 53 20 77 69 74 68 20 61 20 6e 65 77 20 2a 20 |FS with a new * |
00000550 63 6f 6d 6d 61 6e 64 20 69 74 20 69 73 20 6e 65 |command it is ne|
00000560 63 65 73 73 61 72 79 0d 66 6f 72 20 74 68 65 20 |cessary.for the |
00000570 69 6e 74 65 72 70 72 65 74 65 72 20 74 6f 20 72 |interpreter to r|
00000580 65 63 6f 67 6e 69 73 65 20 74 68 65 20 63 6f 6d |ecognise the com|
00000590 6d 61 6e 64 20 61 6e 64 20 74 68 65 6e 20 70 61 |mand and then pa|
000005a0 73 73 20 63 6f 6e 74 72 6f 6c 20 74 6f 0d 61 20 |ss control to.a |
000005b0 72 6f 75 74 69 6e 65 20 77 68 69 63 68 20 77 69 |routine which wi|
000005c0 6c 6c 20 73 65 6c 65 63 74 20 74 68 65 20 52 46 |ll select the RF|
000005d0 53 2c 20 6c 6f 61 64 20 74 68 65 20 70 72 6f 67 |S, load the prog|
000005e0 72 61 6d 20 69 6e 74 6f 20 75 73 65 72 20 6d 65 |ram into user me|
000005f0 6d 6f 72 79 0d 61 6e 64 20 72 75 6e 20 74 68 65 |mory.and run the|
00000600 20 70 72 6f 67 72 61 6d 2e 20 49 66 20 79 6f 75 | program. If you|
00000610 20 68 61 76 65 20 74 68 65 20 70 72 6f 67 72 61 | have the progra|
00000620 6d 20 44 45 4d 4f 20 73 74 6f 72 65 64 20 69 6e |m DEMO stored in|
00000630 20 74 68 65 20 52 46 53 0d 79 6f 75 20 63 6f 75 | the RFS.you cou|
00000640 6c 64 20 61 63 68 69 65 76 65 20 74 68 69 73 20 |ld achieve this |
00000650 73 61 6d 65 20 6f 62 6a 65 63 74 69 76 65 20 62 |same objective b|
00000660 79 20 74 79 70 69 6e 67 3a 0d 0d 3e 2a 42 41 53 |y typing:..>*BAS|
00000670 49 43 0d 3e 2a 52 4f 4d 0d 3e 43 48 41 49 4e 20 |IC.>*ROM.>CHAIN |
00000680 22 44 45 4d 4f 22 0d 0d 20 20 54 68 65 20 69 6e |"DEMO".. The in|
00000690 74 65 72 70 72 65 74 65 72 20 69 6e 20 74 68 65 |terpreter in the|
000006a0 20 70 72 6f 67 72 61 6d 20 52 46 53 45 52 56 20 | program RFSERV |
000006b0 72 75 6e 73 20 74 68 65 20 70 72 6f 67 72 61 6d |runs the program|
000006c0 20 44 45 4d 4f 20 62 79 0d 70 61 73 73 69 6e 67 | DEMO by.passing|
000006d0 20 63 6f 6e 74 72 6f 6c 20 74 6f 20 61 20 72 6f | control to a ro|
000006e0 75 74 69 6e 65 20 77 68 69 63 68 20 64 6f 65 73 |utine which does|
000006f0 20 6a 75 73 74 20 77 68 61 74 20 79 6f 75 20 77 | just what you w|
00000700 6f 75 6c 64 20 64 6f 20 62 75 74 20 69 6e 0d 61 |ould do but in.a|
00000710 20 64 69 66 66 65 72 65 6e 74 20 6f 72 64 65 72 | different order|
00000720 2e 20 49 74 20 66 69 72 73 74 20 73 65 6c 65 63 |. It first selec|
00000730 74 73 20 74 68 65 20 52 46 53 20 77 69 74 68 20 |ts the RFS with |
00000740 4f 73 62 79 74 65 20 26 38 44 2e 20 49 74 20 74 |Osbyte &8D. It t|
00000750 68 65 6e 0d 66 6c 75 73 68 65 73 20 74 68 65 20 |hen.flushes the |
00000760 6b 65 79 62 6f 61 72 64 20 62 75 66 66 65 72 20 |keyboard buffer |
00000770 61 6e 64 20 69 6e 73 65 72 74 73 20 74 68 65 20 |and inserts the |
00000780 73 74 72 69 6e 67 20 43 48 41 49 4e 20 22 44 45 |string CHAIN "DE|
00000790 4d 4f 22 0d 3c 52 65 74 75 72 6e 3e 20 69 6e 74 |MO".<Return> int|
000007a0 6f 20 74 68 65 20 62 75 66 66 65 72 20 61 6e 64 |o the buffer and|
000007b0 20 66 69 6e 61 6c 6c 79 20 69 74 20 75 73 65 73 | finally it uses|
000007c0 20 4f 73 62 79 74 65 20 26 42 42 20 74 6f 20 66 | Osbyte &BB to f|
000007d0 69 6e 64 20 42 41 53 49 43 0d 61 6e 64 20 4f 73 |ind BASIC.and Os|
000007e0 62 79 74 65 20 26 38 45 20 74 6f 20 65 6e 74 65 |byte &8E to ente|
000007f0 72 20 42 41 53 49 43 2e 20 57 68 65 6e 20 42 41 |r BASIC. When BA|
00000800 53 49 43 20 69 73 20 65 6e 74 65 72 65 64 20 69 |SIC is entered i|
00000810 6e 20 74 68 69 73 20 77 61 79 20 69 74 0d 65 78 |n this way it.ex|
00000820 65 63 75 74 65 73 20 74 68 65 20 63 6f 6d 6d 61 |ecutes the comma|
00000830 6e 64 20 69 6e 20 74 68 65 20 6b 65 79 62 6f 61 |nd in the keyboa|
00000840 72 64 20 62 75 66 66 65 72 20 61 6e 64 2c 20 69 |rd buffer and, i|
00000850 6e 20 74 68 69 73 20 65 78 61 6d 70 6c 65 2c 20 |n this example, |
00000860 69 74 0d 77 69 6c 6c 20 63 68 61 69 6e 20 74 68 |it.will chain th|
00000870 65 20 70 72 6f 67 72 61 6d 20 44 45 4d 4f 20 66 |e program DEMO f|
00000880 72 6f 6d 20 74 68 65 20 61 63 74 69 76 65 20 66 |rom the active f|
00000890 69 6c 69 6e 67 20 73 79 73 74 65 6d 2c 20 74 68 |iling system, th|
000008a0 65 20 52 46 53 2e 0d 0d 20 20 54 68 65 20 63 6f |e RFS... The co|
000008b0 64 69 6e 67 20 65 78 65 63 75 74 65 64 20 77 68 |ding executed wh|
000008c0 65 6e 20 74 68 65 20 6e 65 77 20 63 6f 6d 6d 61 |en the new comma|
000008d0 6e 64 20 69 73 20 72 65 63 6f 67 6e 69 73 65 64 |nd is recognised|
000008e0 20 69 73 20 73 68 6f 77 6e 20 69 6e 0d 66 69 67 | is shown in.fig|
000008f0 75 72 65 20 32 30 2e 31 2e 20 54 68 65 20 63 6f |ure 20.1. The co|
00000900 6d 6d 61 6e 64 20 73 74 6f 72 65 64 20 69 6e 20 |mmand stored in |
00000910 74 68 65 20 73 74 72 69 6e 67 20 73 74 61 72 74 |the string start|
00000920 69 6e 67 20 61 74 20 74 68 65 20 6c 61 62 65 6c |ing at the label|
00000930 0d 22 2e 72 66 73 63 6f 6d 6d 22 20 63 61 6e 20 |.".rfscomm" can |
00000940 62 65 20 72 65 70 6c 61 63 65 64 20 77 69 74 68 |be replaced with|
00000950 20 77 68 61 74 65 76 65 72 20 63 6f 6d 6d 61 6e | whatever comman|
00000960 64 2c 20 6f 72 20 73 65 72 69 65 73 20 6f 66 0d |d, or series of.|
00000970 63 6f 6d 6d 61 6e 64 73 2c 20 79 6f 75 20 6e 65 |commands, you ne|
00000980 65 64 20 74 6f 20 72 75 6e 20 79 6f 75 72 20 70 |ed to run your p|
00000990 72 6f 67 72 61 6d 2e 0d 0d 0d 0d 0d 2e 66 6f 75 |rogram.......fou|
000009a0 6e 64 0d 20 20 20 20 20 20 20 20 4c 44 41 20 23 |nd. LDA #|
000009b0 26 38 44 20 20 20 20 20 20 5c 20 4f 73 62 79 74 |&8D \ Osbyt|
000009c0 65 20 26 38 44 0d 20 20 20 20 20 20 20 20 4a 53 |e &8D. JS|
000009d0 52 20 26 46 46 46 34 20 20 20 20 20 5c 20 2a 52 |R &FFF4 \ *R|
000009e0 4f 4d 0d 20 20 20 20 20 20 20 20 4c 44 41 20 23 |OM. LDA #|
000009f0 26 30 46 20 20 20 20 20 20 5c 20 4f 73 62 79 74 |&0F \ Osbyt|
00000a00 65 20 26 30 46 0d 20 20 20 20 20 20 20 20 4c 44 |e &0F. LD|
00000a10 58 20 23 30 0d 20 20 20 20 20 20 20 20 4a 53 52 |X #0. JSR|
00000a20 20 26 46 46 46 34 20 20 20 20 20 5c 20 66 6c 75 | &FFF4 \ flu|
00000a30 73 68 20 61 6c 6c 20 62 75 66 66 65 72 73 0d 20 |sh all buffers. |
00000a40 20 20 20 20 20 20 20 4c 44 41 20 23 26 46 46 20 | LDA #&FF |
00000a50 20 20 20 20 20 5c 20 69 6e 69 74 69 61 6c 69 73 | \ initialis|
00000a60 65 20 6f 66 66 73 65 74 0d 20 20 20 20 20 20 20 |e offset. |
00000a70 20 50 48 41 20 20 20 20 20 20 20 20 20 20 20 5c | PHA \|
00000a80 20 73 74 6f 72 65 20 6f 66 66 73 65 74 0d 2e 6b | store offset..k|
00000a90 65 79 62 6f 61 72 64 0d 20 20 20 20 20 20 20 20 |eyboard. |
00000aa0 50 4c 41 20 20 20 20 20 20 20 20 20 20 20 5c 20 |PLA \ |
00000ab0 6c 6f 61 64 20 41 20 77 69 74 68 20 6f 66 66 73 |load A with offs|
00000ac0 65 74 0d 20 20 20 20 20 20 20 20 54 41 58 20 20 |et. TAX |
00000ad0 20 20 20 20 20 20 20 20 20 5c 20 6f 66 66 73 65 | \ offse|
00000ae0 74 20 69 6e 20 58 0d 20 20 20 20 20 20 20 20 49 |t in X. I|
00000af0 4e 58 20 20 20 20 20 20 20 20 20 20 20 5c 20 69 |NX \ i|
00000b00 6e 63 72 65 6d 65 6e 74 20 6f 66 66 73 65 74 0d |ncrement offset.|
00000b10 20 20 20 20 20 20 20 20 54 58 41 20 20 20 20 20 | TXA |
00000b20 20 20 20 20 20 20 5c 20 63 6f 70 79 20 6f 66 66 | \ copy off|
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00001bc0 44 58 20 23 30 0d 20 20 39 38 30 20 20 20 20 20 |DX #0. 980 |
00001bd0 20 20 20 20 4a 53 52 20 6f 73 62 79 74 65 20 20 | JSR osbyte |
00001be0 20 20 5c 20 46 6c 75 73 68 20 61 6c 6c 20 62 75 | \ Flush all bu|
00001bf0 66 66 65 72 73 0d 20 20 39 39 30 20 20 20 20 20 |ffers. 990 |
00001c00 20 20 20 20 4c 44 41 20 23 26 46 46 0d 20 31 30 | LDA #&FF. 10|
00001c10 30 30 20 20 20 20 20 20 20 20 20 50 48 41 0d 20 |00 PHA. |
00001c20 31 30 31 30 20 2e 6b 65 79 62 6f 61 72 64 0d 20 |1010 .keyboard. |
00001c30 31 30 32 30 20 20 20 20 20 20 20 20 20 50 4c 41 |1020 PLA|
00001c40 0d 20 31 30 33 30 20 20 20 20 20 20 20 20 20 54 |. 1030 T|
00001c50 41 58 0d 20 31 30 34 30 20 20 20 20 20 20 20 20 |AX. 1040 |
00001c60 20 49 4e 58 0d 20 31 30 35 30 20 20 20 20 20 20 | INX. 1050 |
00001c70 20 20 20 54 58 41 0d 20 31 30 36 30 20 20 20 20 | TXA. 1060 |
00001c80 20 20 20 20 20 50 48 41 0d 20 31 30 37 30 20 20 | PHA. 1070 |
00001c90 20 20 20 20 20 20 20 4c 44 59 20 72 66 73 63 6f | LDY rfsco|
00001ca0 6d 6d 2b 64 69 66 66 2c 58 0d 20 31 30 38 30 20 |mm+diff,X. 1080 |
00001cb0 20 20 20 20 20 20 20 20 42 45 51 20 65 6e 64 6b | BEQ endk|
00001cc0 65 79 0d 20 31 30 39 30 20 20 20 20 20 20 20 20 |ey. 1090 |
00001cd0 20 4c 44 41 20 23 26 38 41 0d 20 31 31 30 30 20 | LDA #&8A. 1100 |
00001ce0 20 20 20 20 20 20 20 20 4c 44 58 20 23 30 0d 20 | LDX #0. |
00001cf0 31 31 31 30 20 20 20 20 20 20 20 20 20 4a 53 52 |1110 JSR|
00001d00 20 6f 73 62 79 74 65 0d 20 31 31 32 30 20 20 20 | osbyte. 1120 |
00001d10 20 20 20 20 20 20 4a 4d 50 20 6b 65 79 62 6f 61 | JMP keyboa|
00001d20 72 64 2b 64 69 66 66 0d 20 31 31 33 30 20 2e 65 |rd+diff. 1130 .e|
00001d30 6e 64 6b 65 79 0d 20 31 31 34 30 20 20 20 20 20 |ndkey. 1140 |
00001d40 20 20 20 20 50 4c 41 0d 20 31 31 35 30 20 20 20 | PLA. 1150 |
00001d50 20 20 20 20 20 20 4c 44 41 20 23 26 42 42 0d 20 | LDA #&BB. |
00001d60 31 31 36 30 20 20 20 20 20 20 20 20 20 4c 44 58 |1160 LDX|
00001d70 20 23 30 0d 20 31 31 37 30 20 20 20 20 20 20 20 | #0. 1170 |
00001d80 20 20 4c 44 59 20 23 26 46 46 0d 20 31 31 38 30 | LDY #&FF. 1180|
00001d90 20 20 20 20 20 20 20 20 20 4a 53 52 20 6f 73 62 | JSR osb|
00001da0 79 74 65 20 20 20 20 5c 20 46 69 6e 64 20 42 41 |yte \ Find BA|
00001db0 53 49 43 0d 20 31 31 39 30 20 20 20 20 20 20 20 |SIC. 1190 |
00001dc0 20 20 4c 44 41 20 23 26 38 45 0d 20 31 32 30 30 | LDA #&8E. 1200|
00001dd0 20 20 20 20 20 20 20 20 20 4a 4d 50 20 6f 73 62 | JMP osb|
00001de0 79 74 65 20 20 20 20 5c 20 45 6e 74 65 72 20 42 |yte \ Enter B|
00001df0 41 53 49 43 0d 20 31 32 31 30 20 2e 72 66 73 63 |ASIC. 1210 .rfsc|
00001e00 6f 6d 6d 0d 20 31 32 32 30 20 20 20 20 20 20 20 |omm. 1220 |
00001e10 20 20 4f 50 54 20 46 4e 65 71 75 73 28 22 43 48 | OPT FNequs("CH|
00001e20 41 49 4e 22 22 44 45 4d 4f 22 22 22 29 0d 20 31 |AIN""DEMO"""). 1|
00001e30 32 33 30 20 20 20 20 20 20 20 20 20 4f 50 54 20 |230 OPT |
00001e40 46 4e 65 71 75 62 28 26 30 44 29 0d 20 31 32 34 |FNequb(&0D). 124|
00001e50 30 20 20 20 20 20 20 20 20 20 42 52 4b 0d 20 31 |0 BRK. 1|
00001e60 32 35 30 20 2e 6c 61 73 74 62 79 74 65 0d 20 31 |250 .lastbyte. 1|
00001e70 32 36 30 20 5d 0d 20 31 32 37 30 20 4e 45 58 54 |260 ]. 1270 NEXT|
00001e80 0d 20 31 32 38 30 20 4f 25 3d 6c 61 73 74 62 79 |. 1280 O%=lastby|
00001e90 74 65 0d 20 31 32 39 30 20 43 48 41 49 4e 22 52 |te. 1290 CHAIN"R|
00001ea0 46 53 47 45 4e 22 0d 20 31 33 30 30 20 44 45 46 |FSGEN". 1300 DEF|
00001eb0 46 4e 65 71 75 62 28 62 79 74 65 29 0d 20 31 33 |FNequb(byte). 13|
00001ec0 31 30 20 3f 50 25 3d 62 79 74 65 0d 20 31 33 32 |10 ?P%=byte. 132|
00001ed0 30 20 50 25 3d 50 25 2b 31 0d 20 31 33 33 30 20 |0 P%=P%+1. 1330 |
00001ee0 3d 70 61 73 73 0d 20 31 33 34 30 20 44 45 46 46 |=pass. 1340 DEFF|
00001ef0 4e 65 71 75 77 28 77 6f 72 64 29 0d 20 31 33 35 |Nequw(word). 135|
00001f00 30 20 3f 50 25 3d 77 6f 72 64 20 4d 4f 44 20 32 |0 ?P%=word MOD 2|
00001f10 35 36 0d 20 31 33 36 30 20 50 25 3f 31 3d 77 6f |56. 1360 P%?1=wo|
00001f20 72 64 20 44 49 56 20 32 35 36 0d 20 31 33 37 30 |rd DIV 256. 1370|
00001f30 20 50 25 3d 50 25 2b 32 0d 20 31 33 38 30 20 3d | P%=P%+2. 1380 =|
00001f40 70 61 73 73 0d 20 31 33 39 30 20 44 45 46 46 4e |pass. 1390 DEFFN|
00001f50 65 71 75 64 28 64 6f 75 62 6c 65 29 0d 20 31 34 |equd(double). 14|
00001f60 30 30 20 21 50 25 3d 64 6f 75 62 6c 65 0d 20 31 |00 !P%=double. 1|
00001f70 34 31 30 20 50 25 3d 50 25 2b 34 0d 20 31 34 32 |410 P%=P%+4. 142|
00001f80 30 20 3d 70 61 73 73 0d 20 31 34 33 30 20 44 45 |0 =pass. 1430 DE|
00001f90 46 46 4e 65 71 75 73 28 73 74 72 69 6e 67 24 29 |FFNequs(string$)|
00001fa0 0d 20 31 34 34 30 20 24 50 25 3d 73 74 72 69 6e |. 1440 $P%=strin|
00001fb0 67 24 0d 20 31 34 35 30 20 50 25 3d 50 25 2b 4c |g$. 1450 P%=P%+L|
00001fc0 45 4e 28 73 74 72 69 6e 67 24 29 0d 20 31 34 36 |EN(string$). 146|
00001fd0 30 20 3d 70 61 73 73 0d |0 =pass.|
00001fd8 
18-11-88/T\SWR20.m0
18-11-88/T\SWR20.m1
18-11-88/T\SWR20.m2
18-11-88/T\SWR20.m4
18-11-88/T\SWR20.m5
.