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28-03-88/T\SWR21
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 » telesoftware6.adl |
| Filename: | 28-03-88/T\SWR21 |
| Read OK: | ✔ |
| File size: | 2530 bytes |
| Load address: | 0000 |
| Exec address: | FFFFFFFF |
Duplicates
There is 1 duplicate copy of this file in the archive:
- CEEFAX disks » telesoftware11.adl » 27-11-88/T\SWR21
- CEEFAX disks » telesoftware6.adl » 28-03-88/T\SWR21
File contents
Mastering Sideways ROM & RAM - Module 21 - RFS language rom
-----------------------------------------------------------
In Module 20 you were shown one way in which programs stored in the
RFS can be run with * commands. The programs used to demonstrate the
technique created a service rom image. In this module I will show you
how a language rom design can be used to achieve a similar effect.
One reason why you might choose to implement an RFS language rom is
that it will enable you to design a so called turnkey system as well
as allow you to run the RFS software with a new * command. A turnkey
computer system is one which automatically runs custom software when
it is switched on.
If you have a language rom in socket &0F, or in a battery backed-up
sideways ram socket &0F, then that rom image will be booted when the
computer is switched on and when Ctrl+Break is pressed. This is true
for all language roms in the highest priority rom socket but, if your
custom software is written in BASIC, you would normally have to
re-write your program as an independant machine code language to run
it in this way. Using an RFS language rom will allow you to use your
software in a turnkey system without translating it into an
independant machine code program.
An RFS language rom can be used in socket &0F of the BBC B simply by
moving the other rom chips to make room for it. On the BBC B+ it is
necessary to alter link S13 (to the right of IC46) to give the highest
priority rom socket on the circuit board priority over BASIC. The RFS
language rom image can be configured as the start up language on the
Master by using the *CONFIGURE LANG <rom number> command.
The RFS language rom can also be used in a lower priority socket
than BASIC when it will function like any other language rom and it
will be selected when called with *FX142,n or its * command.
In the program RFSERV the interpreter passed control to a service
routine which selected the RFS, stored a Chain command in the keyboard
buffer, and then entered BASIC which executed the command in the
keyboard buffer. The program RFSLANG achieves the same result by
entering a language which eventually executes the same coding used by
the service routine in RFSERV.
The one command interpreter is used in the program RFSLANG to
compare an unrecognised command with the title string of the rom. If a
match is found the rom uses Osbyte &8E to enter the rom at its
language entry point. When the rom is entered at its language entry
point it must first enable interupts, reset the stack, and re-vector
the break vector to point to an error handling routine (see module
17). The complete language coding from RFSLANG is shown in figure 21.1
.language
CLI \ enable interupt requests
LDX #&FF
TXS \ reset stack
LDA #basic MOD 256 \ low byte of enter BASIC address
STA &202 \ store in Break vector low byte
LDA #basic DIV 256 \ high byte of enter BASIC address
STA &203 \ store in Break vector high byte
LDA #&8D \ Osbyte &8D
JSR &FFF4 \ *ROM
LDA #&8B \ Osbyte &8B
LDX #1
LDY #0
JSR &FFF4 \ *OPT 1,0
LDA #&0F \ Osbyte &0F
LDX #0
JSR &FFF4 \ flush all buffers
LDA #&FF \ initialise offset
PHA \ store offset
.keyboard
PLA \ restore offset
TAX \ transfer offset to X
INX \ increment offset
TXA \ copy offset to A
PHA \ store offset
LDY rfscomm,X \ load character
BEQ basic \ branch if end of text character
LDA #&8A \ Osbyte &8A
LDX #0
JSR &FFF4 \ character into keyboard buffer
JMP keyboard \ go for next character
.basic
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""" \ chain command for BASIC
EQUB &0D \ <Return>
BRK \ end of text marker
Figure 21.1 The language coding from RFSLANG.
----------- ---------------------------------
The break vector in RFSLANG points to the code which finds and
enters BASIC so that, if an error is generated while the language is
active, it responds by entering BASIC. The language defined by RFSLANG
will only ever be active for a few milli-seconds before it selects
BASIC to replace it and generating an error is quite unlikely. I have
been unable to generate an error within the language when testing the
program. This short cut method of dealing with errors by ignoring them
means that the rom will need to be re-booted if they occur.
After initialising the language the coding does the same job as the
service routine in RFSERV. It selects the RFS, inserts the Chain
command into the keyboard buffer, and finds and enters BASIC. When
BASIC is entered in this way it executes the command in the keyboard
buffer and chains the file from the RFS.
The program RFSLANG must be used with the formatting program RFSGEN
and whatever programs you want to store in the RFS. These programs are
used to create the RFS rom image and detailed instructions on using
them were included in Module 18. RFSLANG was written to be used with
the supplied demonstration program DEMO. If you want to use it with
any other program you will need to alter the command string in lines
1310 to 1330. You can also alter the rom title string in line 220 if
you would prefer to select the language with a command other than
*RFS.
10 REM: RFSLANG
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 breakv=&202
110 gsread=&FFC5
120 osbyte=&FFF4
130 FOR pass = 0 TO 2 STEP 2
140 P%=HIMEM
150 [ OPT pass
160 JMP language+diff
170 JMP service+diff
180 OPT FNequb(&C2)
190 OPT FNequb((copyright+diff) MOD 256)
200 BRK
210 .title
220 OPT FNequs("RFS")
230 .copyright
240 BRK
250 OPT FNequs("(C) Gordon Horsington 1987")
260 BRK
270 .service
280 PHA
290 CMP #4
300 BNE trythirteen
310 TXA
320 PHA
330 TYA
340 PHA
350 LDX #&FF
360 .comloop
370 INX
380 LDA title+diff,X
390 BEQ found
400 LDA (comvec),Y
410 INY
420 CMP #ASC(".")
430 BEQ found
440 AND #&DF
450 CMP title+diff,X
460 BEQ comloop
470 PLA
480 TAY
490 PLA
500 TAX
510 PLA
520 RTS
530 .found
540 LDA #&8E
550 LDX romnumber
560 JMP osbyte \ Enter this ROM
570 .trythirteen
580 CMP #13
590 BNE fourteen
600 TYA
610 EOR #&F
620 CMP romnumber
630 BCC out
640 LDA #(lastbyte+diff) MOD 256
650 STA rompoint
660 LDA #(lastbyte+diff) DIV 256
670 STA rompoint+1
680 LDA romnumber
690 EOR #&F
700 STA phrom
710 .exit
720 PLA
730 LDA #0
740 RTS
750 .fourteen
760 CMP #14
770 BNE out
780 LDA phrom
790 EOR #&F
800 CMP romnumber
810 BNE out
820 LDY #0
830 LDA (rompoint),Y
840 TAY
850 INC rompoint
860 BNE exit
870 INC rompoint+1
880 JMP exit+diff
890 .out
900 PLA
910 RTS
920 .language
930 CLI \ Enable interupt requests
940 LDX #&FF
950 TXS \ Reset stack
960 LDA #(basic+diff) MOD 256
970 STA breakv
980 LDA #(basic+diff) DIV 256
990 STA breakv+1
1000 LDA #&8D
1010 JSR osbyte \ *ROM
1020 LDA #&8B
1030 LDX #1
1040 LDY #0
1050 JSR osbyte \ *OPT1,0
1060 LDA #&0F
1070 LDX #0
1080 JSR osbyte \ Flush all buffers
1090 LDA #&FF
1100 PHA
1110 .keyboard
1120 PLA
1130 TAX
1140 INX
1150 TXA
1160 PHA
1170 LDY rfscomm+diff,X
1180 BEQ basic
1190 LDA #&8A
1200 LDX #0
1210 JSR osbyte
1220 JMP keyboard+diff
1230 .basic
1240 LDA #&BB
1250 LDX #0
1260 LDY #&FF
1270 JSR osbyte \ Find BASIC
1280 LDA #&8E
1290 JMP osbyte \ Enter BASIC
1300 .rfscomm
1310 OPT FNequs("CHAIN""DEMO""")
1320 OPT FNequb(&0D)
1330 BRK
1340 .lastbyte
1350 ]
1360 NEXT
1370 O%=lastbyte
1380 CHAIN"RFSGEN"
1390 DEFFNequb(byte)
1400 ?P%=byte
1410 P%=P%+1
1420 =pass
1430 DEFFNequw(word)
1440 ?P%=word MOD 256
1450 P%?1=word DIV 256
1460 P%=P%+2
1470 =pass
1480 DEFFNequd(double)
1490 !P%=double
1500 P%=P%+4
1510 =pass
1520 DEFFNequs(string$)
1530 $P%=string$
1540 P%=P%+LEN(string$)
1550 =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 31 20 2d 20 52 46 53 20 6c |odule 21 - RFS l|
00000030 61 6e 67 75 61 67 65 20 72 6f 6d 0d 2d 2d 2d 2d |anguage rom.----|
00000040 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00000070 2d 2d 2d 2d 2d 2d 2d 0d 0d 20 20 49 6e 20 4d 6f |-------.. In Mo|
00000080 64 75 6c 65 20 32 30 20 79 6f 75 20 77 65 72 65 |dule 20 you were|
00000090 20 73 68 6f 77 6e 20 6f 6e 65 20 77 61 79 20 69 | shown one way i|
000000a0 6e 20 77 68 69 63 68 20 70 72 6f 67 72 61 6d 73 |n which programs|
000000b0 20 73 74 6f 72 65 64 20 69 6e 20 74 68 65 0d 52 | stored in the.R|
000000c0 46 53 20 63 61 6e 20 62 65 20 72 75 6e 20 77 69 |FS can be run wi|
000000d0 74 68 20 2a 20 63 6f 6d 6d 61 6e 64 73 2e 20 54 |th * commands. T|
000000e0 68 65 20 70 72 6f 67 72 61 6d 73 20 75 73 65 64 |he programs used|
000000f0 20 74 6f 20 64 65 6d 6f 6e 73 74 72 61 74 65 20 | to demonstrate |
00000100 74 68 65 0d 74 65 63 68 6e 69 71 75 65 20 63 72 |the.technique cr|
00000110 65 61 74 65 64 20 61 20 73 65 72 76 69 63 65 20 |eated a service |
00000120 72 6f 6d 20 69 6d 61 67 65 2e 20 49 6e 20 74 68 |rom image. In th|
00000130 69 73 20 6d 6f 64 75 6c 65 20 49 20 77 69 6c 6c |is module I will|
00000140 20 73 68 6f 77 20 79 6f 75 0d 68 6f 77 20 61 20 | show you.how a |
00000150 6c 61 6e 67 75 61 67 65 20 72 6f 6d 20 64 65 73 |language rom des|
00000160 69 67 6e 20 63 61 6e 20 62 65 20 75 73 65 64 20 |ign can be used |
00000170 74 6f 20 61 63 68 69 65 76 65 20 61 20 73 69 6d |to achieve a sim|
00000180 69 6c 61 72 20 65 66 66 65 63 74 2e 0d 0d 20 20 |ilar effect... |
00000190 4f 6e 65 20 72 65 61 73 6f 6e 20 77 68 79 20 79 |One reason why y|
000001a0 6f 75 20 6d 69 67 68 74 20 63 68 6f 6f 73 65 20 |ou might choose |
000001b0 74 6f 20 69 6d 70 6c 65 6d 65 6e 74 20 61 6e 20 |to implement an |
000001c0 52 46 53 20 6c 61 6e 67 75 61 67 65 20 72 6f 6d |RFS language rom|
000001d0 20 69 73 0d 74 68 61 74 20 69 74 20 77 69 6c 6c | is.that it will|
000001e0 20 65 6e 61 62 6c 65 20 79 6f 75 20 74 6f 20 64 | enable you to d|
000001f0 65 73 69 67 6e 20 61 20 73 6f 20 63 61 6c 6c 65 |esign a so calle|
00000200 64 20 74 75 72 6e 6b 65 79 20 73 79 73 74 65 6d |d turnkey system|
00000210 20 61 73 20 77 65 6c 6c 0d 61 73 20 61 6c 6c 6f | as well.as allo|
00000220 77 20 79 6f 75 20 74 6f 20 72 75 6e 20 74 68 65 |w you to run the|
00000230 20 52 46 53 20 73 6f 66 74 77 61 72 65 20 77 69 | RFS software wi|
00000240 74 68 20 61 20 6e 65 77 20 2a 20 63 6f 6d 6d 61 |th a new * comma|
00000250 6e 64 2e 20 41 20 74 75 72 6e 6b 65 79 0d 63 6f |nd. A turnkey.co|
00000260 6d 70 75 74 65 72 20 73 79 73 74 65 6d 20 69 73 |mputer system is|
00000270 20 6f 6e 65 20 77 68 69 63 68 20 61 75 74 6f 6d | one which autom|
00000280 61 74 69 63 61 6c 6c 79 20 72 75 6e 73 20 63 75 |atically runs cu|
00000290 73 74 6f 6d 20 73 6f 66 74 77 61 72 65 20 77 68 |stom software wh|
000002a0 65 6e 0d 69 74 20 69 73 20 73 77 69 74 63 68 65 |en.it is switche|
000002b0 64 20 6f 6e 2e 0d 0d 20 20 49 66 20 79 6f 75 20 |d on... If you |
000002c0 68 61 76 65 20 61 20 6c 61 6e 67 75 61 67 65 20 |have a language |
000002d0 72 6f 6d 20 69 6e 20 73 6f 63 6b 65 74 20 26 30 |rom in socket &0|
000002e0 46 2c 20 6f 72 20 69 6e 20 61 20 62 61 74 74 65 |F, or in a batte|
000002f0 72 79 20 62 61 63 6b 65 64 2d 75 70 0d 73 69 64 |ry backed-up.sid|
00000300 65 77 61 79 73 20 72 61 6d 20 73 6f 63 6b 65 74 |eways ram socket|
00000310 20 26 30 46 2c 20 74 68 65 6e 20 74 68 61 74 20 | &0F, then that |
00000320 72 6f 6d 20 69 6d 61 67 65 20 77 69 6c 6c 20 62 |rom image will b|
00000330 65 20 62 6f 6f 74 65 64 20 77 68 65 6e 20 74 68 |e booted when th|
00000340 65 0d 63 6f 6d 70 75 74 65 72 20 69 73 20 73 77 |e.computer is sw|
00000350 69 74 63 68 65 64 20 6f 6e 20 61 6e 64 20 77 68 |itched on and wh|
00000360 65 6e 20 43 74 72 6c 2b 42 72 65 61 6b 20 69 73 |en Ctrl+Break is|
00000370 20 70 72 65 73 73 65 64 2e 20 54 68 69 73 20 69 | pressed. This i|
00000380 73 20 74 72 75 65 0d 66 6f 72 20 61 6c 6c 20 6c |s true.for all l|
00000390 61 6e 67 75 61 67 65 20 72 6f 6d 73 20 69 6e 20 |anguage roms in |
000003a0 74 68 65 20 68 69 67 68 65 73 74 20 70 72 69 6f |the highest prio|
000003b0 72 69 74 79 20 72 6f 6d 20 73 6f 63 6b 65 74 20 |rity rom socket |
000003c0 62 75 74 2c 20 69 66 20 79 6f 75 72 0d 63 75 73 |but, if your.cus|
000003d0 74 6f 6d 20 73 6f 66 74 77 61 72 65 20 69 73 20 |tom software is |
000003e0 77 72 69 74 74 65 6e 20 69 6e 20 42 41 53 49 43 |written in BASIC|
000003f0 2c 20 79 6f 75 20 77 6f 75 6c 64 20 6e 6f 72 6d |, you would norm|
00000400 61 6c 6c 79 20 68 61 76 65 20 74 6f 0d 72 65 2d |ally have to.re-|
00000410 77 72 69 74 65 20 79 6f 75 72 20 70 72 6f 67 72 |write your progr|
00000420 61 6d 20 61 73 20 61 6e 20 69 6e 64 65 70 65 6e |am as an indepen|
00000430 64 61 6e 74 20 6d 61 63 68 69 6e 65 20 63 6f 64 |dant machine cod|
00000440 65 20 6c 61 6e 67 75 61 67 65 20 74 6f 20 72 75 |e language to ru|
00000450 6e 0d 69 74 20 69 6e 20 74 68 69 73 20 77 61 79 |n.it in this way|
00000460 2e 20 55 73 69 6e 67 20 61 6e 20 52 46 53 20 6c |. Using an RFS l|
00000470 61 6e 67 75 61 67 65 20 72 6f 6d 20 77 69 6c 6c |anguage rom will|
00000480 20 61 6c 6c 6f 77 20 79 6f 75 20 74 6f 20 75 73 | allow you to us|
00000490 65 20 79 6f 75 72 0d 73 6f 66 74 77 61 72 65 20 |e your.software |
000004a0 69 6e 20 61 20 74 75 72 6e 6b 65 79 20 73 79 73 |in a turnkey sys|
000004b0 74 65 6d 20 77 69 74 68 6f 75 74 20 74 72 61 6e |tem without tran|
000004c0 73 6c 61 74 69 6e 67 20 69 74 20 69 6e 74 6f 20 |slating it into |
000004d0 61 6e 0d 69 6e 64 65 70 65 6e 64 61 6e 74 20 6d |an.independant m|
000004e0 61 63 68 69 6e 65 20 63 6f 64 65 20 70 72 6f 67 |achine code prog|
000004f0 72 61 6d 2e 0d 0d 20 20 41 6e 20 52 46 53 20 6c |ram... An RFS l|
00000500 61 6e 67 75 61 67 65 20 72 6f 6d 20 63 61 6e 20 |anguage rom can |
00000510 62 65 20 75 73 65 64 20 69 6e 20 73 6f 63 6b 65 |be used in socke|
00000520 74 20 26 30 46 20 6f 66 20 74 68 65 20 42 42 43 |t &0F of the BBC|
00000530 20 42 20 73 69 6d 70 6c 79 20 62 79 0d 6d 6f 76 | B simply by.mov|
00000540 69 6e 67 20 74 68 65 20 6f 74 68 65 72 20 72 6f |ing the other ro|
00000550 6d 20 63 68 69 70 73 20 74 6f 20 6d 61 6b 65 20 |m chips to make |
00000560 72 6f 6f 6d 20 66 6f 72 20 69 74 2e 20 4f 6e 20 |room for it. On |
00000570 74 68 65 20 42 42 43 20 42 2b 20 69 74 20 69 73 |the BBC B+ it is|
00000580 0d 6e 65 63 65 73 73 61 72 79 20 74 6f 20 61 6c |.necessary to al|
00000590 74 65 72 20 6c 69 6e 6b 20 53 31 33 20 28 74 6f |ter link S13 (to|
000005a0 20 74 68 65 20 72 69 67 68 74 20 6f 66 20 49 43 | the right of IC|
000005b0 34 36 29 20 74 6f 20 67 69 76 65 20 74 68 65 20 |46) to give the |
000005c0 68 69 67 68 65 73 74 0d 70 72 69 6f 72 69 74 79 |highest.priority|
000005d0 20 72 6f 6d 20 73 6f 63 6b 65 74 20 6f 6e 20 74 | rom socket on t|
000005e0 68 65 20 63 69 72 63 75 69 74 20 62 6f 61 72 64 |he circuit board|
000005f0 20 70 72 69 6f 72 69 74 79 20 6f 76 65 72 20 42 | priority over B|
00000600 41 53 49 43 2e 20 54 68 65 20 52 46 53 0d 6c 61 |ASIC. The RFS.la|
00000610 6e 67 75 61 67 65 20 72 6f 6d 20 69 6d 61 67 65 |nguage rom image|
00000620 20 63 61 6e 20 62 65 20 63 6f 6e 66 69 67 75 72 | can be configur|
00000630 65 64 20 61 73 20 74 68 65 20 73 74 61 72 74 20 |ed as the start |
00000640 75 70 20 6c 61 6e 67 75 61 67 65 20 6f 6e 20 74 |up language on t|
00000650 68 65 0d 4d 61 73 74 65 72 20 62 79 20 75 73 69 |he.Master by usi|
00000660 6e 67 20 74 68 65 20 2a 43 4f 4e 46 49 47 55 52 |ng the *CONFIGUR|
00000670 45 20 4c 41 4e 47 20 3c 72 6f 6d 20 6e 75 6d 62 |E LANG <rom numb|
00000680 65 72 3e 20 63 6f 6d 6d 61 6e 64 2e 0d 0d 20 20 |er> command... |
00000690 54 68 65 20 52 46 53 20 6c 61 6e 67 75 61 67 65 |The RFS language|
000006a0 20 72 6f 6d 20 63 61 6e 20 61 6c 73 6f 20 62 65 | rom can also be|
000006b0 20 75 73 65 64 20 69 6e 20 61 20 6c 6f 77 65 72 | used in a lower|
000006c0 20 70 72 69 6f 72 69 74 79 20 73 6f 63 6b 65 74 | priority socket|
000006d0 0d 74 68 61 6e 20 42 41 53 49 43 20 77 68 65 6e |.than BASIC when|
000006e0 20 69 74 20 77 69 6c 6c 20 66 75 6e 63 74 69 6f | it will functio|
000006f0 6e 20 6c 69 6b 65 20 61 6e 79 20 6f 74 68 65 72 |n like any other|
00000700 20 6c 61 6e 67 75 61 67 65 20 72 6f 6d 20 61 6e | language rom an|
00000710 64 20 69 74 0d 77 69 6c 6c 20 62 65 20 73 65 6c |d it.will be sel|
00000720 65 63 74 65 64 20 77 68 65 6e 20 63 61 6c 6c 65 |ected when calle|
00000730 64 20 77 69 74 68 20 2a 46 58 31 34 32 2c 6e 20 |d with *FX142,n |
00000740 6f 72 20 69 74 73 20 2a 20 63 6f 6d 6d 61 6e 64 |or its * command|
00000750 2e 0d 0d 20 20 49 6e 20 74 68 65 20 70 72 6f 67 |... In the prog|
00000760 72 61 6d 20 52 46 53 45 52 56 20 74 68 65 20 69 |ram RFSERV the i|
00000770 6e 74 65 72 70 72 65 74 65 72 20 70 61 73 73 65 |nterpreter passe|
00000780 64 20 63 6f 6e 74 72 6f 6c 20 74 6f 20 61 20 73 |d control to a s|
00000790 65 72 76 69 63 65 0d 72 6f 75 74 69 6e 65 20 77 |ervice.routine w|
000007a0 68 69 63 68 20 73 65 6c 65 63 74 65 64 20 74 68 |hich selected th|
000007b0 65 20 52 46 53 2c 20 73 74 6f 72 65 64 20 61 20 |e RFS, stored a |
000007c0 43 68 61 69 6e 20 63 6f 6d 6d 61 6e 64 20 69 6e |Chain command in|
000007d0 20 74 68 65 20 6b 65 79 62 6f 61 72 64 0d 62 75 | the keyboard.bu|
000007e0 66 66 65 72 2c 20 61 6e 64 20 74 68 65 6e 20 65 |ffer, and then e|
000007f0 6e 74 65 72 65 64 20 42 41 53 49 43 20 77 68 69 |ntered BASIC whi|
00000800 63 68 20 65 78 65 63 75 74 65 64 20 74 68 65 20 |ch executed the |
00000810 63 6f 6d 6d 61 6e 64 20 69 6e 20 74 68 65 0d 6b |command in the.k|
00000820 65 79 62 6f 61 72 64 20 62 75 66 66 65 72 2e 20 |eyboard buffer. |
00000830 54 68 65 20 70 72 6f 67 72 61 6d 20 52 46 53 4c |The program RFSL|
00000840 41 4e 47 20 61 63 68 69 65 76 65 73 20 74 68 65 |ANG achieves the|
00000850 20 73 61 6d 65 20 72 65 73 75 6c 74 20 62 79 0d | same result by.|
00000860 65 6e 74 65 72 69 6e 67 20 61 20 6c 61 6e 67 75 |entering a langu|
00000870 61 67 65 20 77 68 69 63 68 20 65 76 65 6e 74 75 |age which eventu|
00000880 61 6c 6c 79 20 65 78 65 63 75 74 65 73 20 74 68 |ally executes th|
00000890 65 20 73 61 6d 65 20 63 6f 64 69 6e 67 20 75 73 |e same coding us|
000008a0 65 64 20 62 79 0d 74 68 65 20 73 65 72 76 69 63 |ed by.the servic|
000008b0 65 20 72 6f 75 74 69 6e 65 20 69 6e 20 52 46 53 |e routine in RFS|
000008c0 45 52 56 2e 0d 0d 20 20 54 68 65 20 6f 6e 65 20 |ERV... The one |
000008d0 63 6f 6d 6d 61 6e 64 20 69 6e 74 65 72 70 72 65 |command interpre|
000008e0 74 65 72 20 69 73 20 75 73 65 64 20 69 6e 20 74 |ter is used in t|
000008f0 68 65 20 70 72 6f 67 72 61 6d 20 52 46 53 4c 41 |he program RFSLA|
00000900 4e 47 20 74 6f 0d 63 6f 6d 70 61 72 65 20 61 6e |NG to.compare an|
00000910 20 75 6e 72 65 63 6f 67 6e 69 73 65 64 20 63 6f | unrecognised co|
00000920 6d 6d 61 6e 64 20 77 69 74 68 20 74 68 65 20 74 |mmand with the t|
00000930 69 74 6c 65 20 73 74 72 69 6e 67 20 6f 66 20 74 |itle string of t|
00000940 68 65 20 72 6f 6d 2e 20 49 66 20 61 0d 6d 61 74 |he rom. If a.mat|
00000950 63 68 20 69 73 20 66 6f 75 6e 64 20 74 68 65 20 |ch is found the |
00000960 72 6f 6d 20 75 73 65 73 20 4f 73 62 79 74 65 20 |rom uses Osbyte |
00000970 26 38 45 20 74 6f 20 65 6e 74 65 72 20 74 68 65 |&8E to enter the|
00000980 20 72 6f 6d 20 61 74 20 69 74 73 0d 6c 61 6e 67 | rom at its.lang|
00000990 75 61 67 65 20 65 6e 74 72 79 20 70 6f 69 6e 74 |uage entry point|
000009a0 2e 20 57 68 65 6e 20 74 68 65 20 72 6f 6d 20 69 |. When the rom i|
000009b0 73 20 65 6e 74 65 72 65 64 20 61 74 20 69 74 73 |s entered at its|
000009c0 20 6c 61 6e 67 75 61 67 65 20 65 6e 74 72 79 0d | language entry.|
000009d0 70 6f 69 6e 74 20 69 74 20 6d 75 73 74 20 66 69 |point it must fi|
000009e0 72 73 74 20 65 6e 61 62 6c 65 20 69 6e 74 65 72 |rst enable inter|
000009f0 75 70 74 73 2c 20 72 65 73 65 74 20 74 68 65 20 |upts, reset the |
00000a00 73 74 61 63 6b 2c 20 61 6e 64 20 72 65 2d 76 65 |stack, and re-ve|
00000a10 63 74 6f 72 0d 74 68 65 20 62 72 65 61 6b 20 76 |ctor.the break v|
00000a20 65 63 74 6f 72 20 74 6f 20 70 6f 69 6e 74 20 74 |ector to point t|
00000a30 6f 20 61 6e 20 65 72 72 6f 72 20 68 61 6e 64 6c |o an error handl|
00000a40 69 6e 67 20 72 6f 75 74 69 6e 65 20 28 73 65 65 |ing routine (see|
00000a50 20 6d 6f 64 75 6c 65 0d 31 37 29 2e 20 54 68 65 | module.17). The|
00000a60 20 63 6f 6d 70 6c 65 74 65 20 6c 61 6e 67 75 61 | complete langua|
00000a70 67 65 20 63 6f 64 69 6e 67 20 66 72 6f 6d 20 52 |ge coding from R|
00000a80 46 53 4c 41 4e 47 20 69 73 20 73 68 6f 77 6e 20 |FSLANG is shown |
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00001b70 39 30 20 20 20 20 20 20 20 20 20 50 4c 41 0d 20 |90 PLA. |
00001b80 20 35 30 30 20 20 20 20 20 20 20 20 20 54 41 58 | 500 TAX|
00001b90 0d 20 20 35 31 30 20 20 20 20 20 20 20 20 20 50 |. 510 P|
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00001bb0 20 52 54 53 0d 20 20 35 33 30 20 2e 66 6f 75 6e | RTS. 530 .foun|
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00001be0 20 20 20 20 20 20 20 4c 44 58 20 72 6f 6d 6e 75 | LDX romnu|
00001bf0 6d 62 65 72 0d 20 20 35 36 30 20 20 20 20 20 20 |mber. 560 |
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00001c40 20 20 20 43 4d 50 20 23 31 33 0d 20 20 35 39 30 | CMP #13. 590|
00001c50 20 20 20 20 20 20 20 20 20 42 4e 45 20 66 6f 75 | BNE fou|
00001c60 72 74 65 65 6e 0d 20 20 36 30 30 20 20 20 20 20 |rteen. 600 |
00001c70 20 20 20 20 54 59 41 0d 20 20 36 31 30 20 20 20 | TYA. 610 |
00001c80 20 20 20 20 20 20 45 4f 52 20 23 26 46 0d 20 20 | EOR #&F. |
00001c90 36 32 30 20 20 20 20 20 20 20 20 20 43 4d 50 20 |620 CMP |
00001ca0 72 6f 6d 6e 75 6d 62 65 72 0d 20 20 36 33 30 20 |romnumber. 630 |
00001cb0 20 20 20 20 20 20 20 20 42 43 43 20 6f 75 74 0d | BCC out.|
00001cc0 20 20 36 34 30 20 20 20 20 20 20 20 20 20 4c 44 | 640 LD|
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00001cf0 20 20 20 20 20 20 20 20 20 53 54 41 20 72 6f 6d | STA rom|
00001d00 70 6f 69 6e 74 0d 20 20 36 36 30 20 20 20 20 20 |point. 660 |
00001d10 20 20 20 20 4c 44 41 20 23 28 6c 61 73 74 62 79 | LDA #(lastby|
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00001d30 0d 20 20 36 37 30 20 20 20 20 20 20 20 20 20 53 |. 670 S|
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00001d50 36 38 30 20 20 20 20 20 20 20 20 20 4c 44 41 20 |680 LDA |
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00001d70 20 20 20 20 20 20 20 20 45 4f 52 20 23 26 46 0d | EOR #&F.|
00001d80 20 20 37 30 30 20 20 20 20 20 20 20 20 20 53 54 | 700 ST|
00001d90 41 20 70 68 72 6f 6d 0d 20 20 37 31 30 20 2e 65 |A phrom. 710 .e|
00001da0 78 69 74 0d 20 20 37 32 30 20 20 20 20 20 20 20 |xit. 720 |
00001db0 20 20 50 4c 41 0d 20 20 37 33 30 20 20 20 20 20 | PLA. 730 |
00001dc0 20 20 20 20 4c 44 41 20 23 30 0d 20 20 37 34 30 | LDA #0. 740|
00001dd0 20 20 20 20 20 20 20 20 20 52 54 53 0d 20 20 37 | RTS. 7|
00001de0 35 30 20 2e 66 6f 75 72 74 65 65 6e 0d 20 20 37 |50 .fourteen. 7|
00001df0 36 30 20 20 20 20 20 20 20 20 20 43 4d 50 20 23 |60 CMP #|
00001e00 31 34 0d 20 20 37 37 30 20 20 20 20 20 20 20 20 |14. 770 |
00001e10 20 42 4e 45 20 6f 75 74 0d 20 20 37 38 30 20 20 | BNE out. 780 |
00001e20 20 20 20 20 20 20 20 4c 44 41 20 70 68 72 6f 6d | LDA phrom|
00001e30 0d 20 20 37 39 30 20 20 20 20 20 20 20 20 20 45 |. 790 E|
00001e40 4f 52 20 23 26 46 0d 20 20 38 30 30 20 20 20 20 |OR #&F. 800 |
00001e50 20 20 20 20 20 43 4d 50 20 72 6f 6d 6e 75 6d 62 | CMP romnumb|
00001e60 65 72 0d 20 20 38 31 30 20 20 20 20 20 20 20 20 |er. 810 |
00001e70 20 42 4e 45 20 6f 75 74 0d 20 20 38 32 30 20 20 | BNE out. 820 |
00001e80 20 20 20 20 20 20 20 4c 44 59 20 23 30 0d 20 20 | LDY #0. |
00001e90 38 33 30 20 20 20 20 20 20 20 20 20 4c 44 41 20 |830 LDA |
00001ea0 28 72 6f 6d 70 6f 69 6e 74 29 2c 59 0d 20 20 38 |(rompoint),Y. 8|
00001eb0 34 30 20 20 20 20 20 20 20 20 20 54 41 59 0d 20 |40 TAY. |
00001ec0 20 38 35 30 20 20 20 20 20 20 20 20 20 49 4e 43 | 850 INC|
00001ed0 20 72 6f 6d 70 6f 69 6e 74 0d 20 20 38 36 30 20 | rompoint. 860 |
00001ee0 20 20 20 20 20 20 20 20 42 4e 45 20 65 78 69 74 | BNE exit|
00001ef0 0d 20 20 38 37 30 20 20 20 20 20 20 20 20 20 49 |. 870 I|
00001f00 4e 43 20 72 6f 6d 70 6f 69 6e 74 2b 31 0d 20 20 |NC rompoint+1. |
00001f10 38 38 30 20 20 20 20 20 20 20 20 20 4a 4d 50 20 |880 JMP |
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00001f30 2e 6f 75 74 0d 20 20 39 30 30 20 20 20 20 20 20 |.out. 900 |
00001f40 20 20 20 50 4c 41 0d 20 20 39 31 30 20 20 20 20 | PLA. 910 |
00001f50 20 20 20 20 20 52 54 53 0d 20 20 39 32 30 20 2e | RTS. 920 .|
00001f60 6c 61 6e 67 75 61 67 65 0d 20 20 39 33 30 20 20 |language. 930 |
00001f70 20 20 20 20 20 20 20 43 4c 49 20 20 20 20 20 20 | CLI |
00001f80 20 20 20 20 20 5c 20 45 6e 61 62 6c 65 20 69 6e | \ Enable in|
00001f90 74 65 72 75 70 74 20 72 65 71 75 65 73 74 73 0d |terupt requests.|
00001fa0 20 20 39 34 30 20 20 20 20 20 20 20 20 20 4c 44 | 940 LD|
00001fb0 58 20 23 26 46 46 0d 20 20 39 35 30 20 20 20 20 |X #&FF. 950 |
00001fc0 20 20 20 20 20 54 58 53 20 20 20 20 20 20 20 20 | TXS |
00001fd0 20 20 20 5c 20 52 65 73 65 74 20 73 74 61 63 6b | \ Reset stack|
00001fe0 0d 20 20 39 36 30 20 20 20 20 20 20 20 20 20 4c |. 960 L|
00001ff0 44 41 20 23 28 62 61 73 69 63 2b 64 69 66 66 29 |DA #(basic+diff)|
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00002010 20 20 20 20 20 20 20 53 54 41 20 62 72 65 61 6b | STA break|
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00002050 20 20 20 20 20 20 20 20 53 54 41 20 62 72 65 61 | STA brea|
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00002080 30 20 20 20 20 20 20 20 20 20 4a 53 52 20 6f 73 |0 JSR os|
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000020a0 31 30 32 30 20 20 20 20 20 20 20 20 20 4c 44 41 |1020 LDA|
000020b0 20 23 26 38 42 0d 20 31 30 33 30 20 20 20 20 20 | #&8B. 1030 |
000020c0 20 20 20 20 4c 44 58 20 23 31 0d 20 31 30 34 30 | LDX #1. 1040|
000020d0 20 20 20 20 20 20 20 20 20 4c 44 59 20 23 30 0d | LDY #0.|
000020e0 20 31 30 35 30 20 20 20 20 20 20 20 20 20 4a 53 | 1050 JS|
000020f0 52 20 6f 73 62 79 74 65 20 20 20 20 5c 20 2a 4f |R osbyte \ *O|
00002100 50 54 31 2c 30 0d 20 31 30 36 30 20 20 20 20 20 |PT1,0. 1060 |
00002110 20 20 20 20 4c 44 41 20 23 26 30 46 0d 20 31 30 | LDA #&0F. 10|
00002120 37 30 20 20 20 20 20 20 20 20 20 4c 44 58 20 23 |70 LDX #|
00002130 30 0d 20 31 30 38 30 20 20 20 20 20 20 20 20 20 |0. 1080 |
00002140 4a 53 52 20 6f 73 62 79 74 65 20 20 20 20 5c 20 |JSR osbyte \ |
00002150 46 6c 75 73 68 20 61 6c 6c 20 62 75 66 66 65 72 |Flush all buffer|
00002160 73 0d 20 31 30 39 30 20 20 20 20 20 20 20 20 20 |s. 1090 |
00002170 4c 44 41 20 23 26 46 46 0d 20 31 31 30 30 20 20 |LDA #&FF. 1100 |
00002180 20 20 20 20 20 20 20 50 48 41 0d 20 31 31 31 30 | PHA. 1110|
00002190 20 2e 6b 65 79 62 6f 61 72 64 0d 20 31 31 32 30 | .keyboard. 1120|
000021a0 20 20 20 20 20 20 20 20 20 50 4c 41 0d 20 31 31 | PLA. 11|
000021b0 33 30 20 20 20 20 20 20 20 20 20 54 41 58 0d 20 |30 TAX. |
000021c0 31 31 34 30 20 20 20 20 20 20 20 20 20 49 4e 58 |1140 INX|
000021d0 0d 20 31 31 35 30 20 20 20 20 20 20 20 20 20 54 |. 1150 T|
000021e0 58 41 0d 20 31 31 36 30 20 20 20 20 20 20 20 20 |XA. 1160 |
000021f0 20 50 48 41 0d 20 31 31 37 30 20 20 20 20 20 20 | PHA. 1170 |
00002200 20 20 20 4c 44 59 20 72 66 73 63 6f 6d 6d 2b 64 | LDY rfscomm+d|
00002210 69 66 66 2c 58 0d 20 31 31 38 30 20 20 20 20 20 |iff,X. 1180 |
00002220 20 20 20 20 42 45 51 20 62 61 73 69 63 0d 20 31 | BEQ basic. 1|
00002230 31 39 30 20 20 20 20 20 20 20 20 20 4c 44 41 20 |190 LDA |
00002240 23 26 38 41 0d 20 31 32 30 30 20 20 20 20 20 20 |#&8A. 1200 |
00002250 20 20 20 4c 44 58 20 23 30 0d 20 31 32 31 30 20 | LDX #0. 1210 |
00002260 20 20 20 20 20 20 20 20 4a 53 52 20 6f 73 62 79 | JSR osby|
00002270 74 65 0d 20 31 32 32 30 20 20 20 20 20 20 20 20 |te. 1220 |
00002280 20 4a 4d 50 20 6b 65 79 62 6f 61 72 64 2b 64 69 | JMP keyboard+di|
00002290 66 66 0d 20 31 32 33 30 20 2e 62 61 73 69 63 0d |ff. 1230 .basic.|
000022a0 20 31 32 34 30 20 20 20 20 20 20 20 20 20 4c 44 | 1240 LD|
000022b0 41 20 23 26 42 42 0d 20 31 32 35 30 20 20 20 20 |A #&BB. 1250 |
000022c0 20 20 20 20 20 4c 44 58 20 23 30 0d 20 31 32 36 | LDX #0. 126|
000022d0 30 20 20 20 20 20 20 20 20 20 4c 44 59 20 23 26 |0 LDY #&|
000022e0 46 46 0d 20 31 32 37 30 20 20 20 20 20 20 20 20 |FF. 1270 |
000022f0 20 4a 53 52 20 6f 73 62 79 74 65 20 20 20 20 5c | JSR osbyte \|
00002300 20 46 69 6e 64 20 42 41 53 49 43 0d 20 31 32 38 | Find BASIC. 128|
00002310 30 20 20 20 20 20 20 20 20 20 4c 44 41 20 23 26 |0 LDA #&|
00002320 38 45 0d 20 31 32 39 30 20 20 20 20 20 20 20 20 |8E. 1290 |
00002330 20 4a 4d 50 20 6f 73 62 79 74 65 20 20 20 20 5c | JMP osbyte \|
00002340 20 45 6e 74 65 72 20 42 41 53 49 43 0d 20 31 33 | Enter BASIC. 13|
00002350 30 30 20 2e 72 66 73 63 6f 6d 6d 0d 20 31 33 31 |00 .rfscomm. 131|
00002360 30 20 20 20 20 20 20 20 20 20 4f 50 54 20 46 4e |0 OPT FN|
00002370 65 71 75 73 28 22 43 48 41 49 4e 22 22 44 45 4d |equs("CHAIN""DEM|
00002380 4f 22 22 22 29 0d 20 31 33 32 30 20 20 20 20 20 |O"""). 1320 |
00002390 20 20 20 20 4f 50 54 20 46 4e 65 71 75 62 28 26 | OPT FNequb(&|
000023a0 30 44 29 0d 20 31 33 33 30 20 20 20 20 20 20 20 |0D). 1330 |
000023b0 20 20 42 52 4b 0d 20 31 33 34 30 20 2e 6c 61 73 | BRK. 1340 .las|
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000023d0 33 36 30 20 4e 45 58 54 0d 20 31 33 37 30 20 4f |360 NEXT. 1370 O|
000023e0 25 3d 6c 61 73 74 62 79 74 65 0d 20 31 33 38 30 |%=lastbyte. 1380|
000023f0 20 43 48 41 49 4e 22 52 46 53 47 45 4e 22 0d 20 | CHAIN"RFSGEN". |
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00002420 79 74 65 0d 20 31 34 31 30 20 50 25 3d 50 25 2b |yte. 1410 P%=P%+|
00002430 31 0d 20 31 34 32 30 20 3d 70 61 73 73 0d 20 31 |1. 1420 =pass. 1|
00002440 34 33 30 20 44 45 46 46 4e 65 71 75 77 28 77 6f |430 DEFFNequw(wo|
00002450 72 64 29 0d 20 31 34 34 30 20 3f 50 25 3d 77 6f |rd). 1440 ?P%=wo|
00002460 72 64 20 4d 4f 44 20 32 35 36 0d 20 31 34 35 30 |rd MOD 256. 1450|
00002470 20 50 25 3f 31 3d 77 6f 72 64 20 44 49 56 20 32 | P%?1=word DIV 2|
00002480 35 36 0d 20 31 34 36 30 20 50 25 3d 50 25 2b 32 |56. 1460 P%=P%+2|
00002490 0d 20 31 34 37 30 20 3d 70 61 73 73 0d 20 31 34 |. 1470 =pass. 14|
000024a0 38 30 20 44 45 46 46 4e 65 71 75 64 28 64 6f 75 |80 DEFFNequd(dou|
000024b0 62 6c 65 29 0d 20 31 34 39 30 20 21 50 25 3d 64 |ble). 1490 !P%=d|
000024c0 6f 75 62 6c 65 0d 20 31 35 30 30 20 50 25 3d 50 |ouble. 1500 P%=P|
000024d0 25 2b 34 0d 20 31 35 31 30 20 3d 70 61 73 73 0d |%+4. 1510 =pass.|
000024e0 20 31 35 32 30 20 44 45 46 46 4e 65 71 75 73 28 | 1520 DEFFNequs(|
000024f0 73 74 72 69 6e 67 24 29 0d 20 31 35 33 30 20 24 |string$). 1530 $|
00002500 50 25 3d 73 74 72 69 6e 67 24 0d 20 31 35 34 30 |P%=string$. 1540|
00002510 20 50 25 3d 50 25 2b 4c 45 4e 28 73 74 72 69 6e | P%=P%+LEN(strin|
00002520 67 24 29 0d 20 31 35 35 30 20 3d 70 61 73 73 0d |g$). 1550 =pass.|
00002530 
28-03-88/T\SWR21.m0
28-03-88/T\SWR21.m1
28-03-88/T\SWR21.m2
28-03-88/T\SWR21.m4
28-03-88/T\SWR21.m5
.