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07-01-88/T\MOU06
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 » telesoftware11.adl |
| Filename: | 07-01-88/T\MOU06 |
| Read OK: | ✔ |
| File size: | 4AD5 bytes |
| Load address: | 0000 |
| Exec address: | FFFFFFFF |
File contents
Using a mouse with the BBC microcomputer - by - Gordon Horsington
-----------------------------------------------------------------
Module 6. Sideways RAM (SWR) mouse software
-------------------------------------------
The demonstration program used in module 5 can be altered to run from
Sideways RAM. Unrecognised IRQ interrupts are first offered to the paged
ROMs and then to the user via the IRQ2 vector. An unprocessed mouse
interrupt will always be offered to the paged ROMs and it can therefore be
processed in SWR without having to revector IRQ1V.
Service call 5 is used to offer unrecognised interrupts to the paged ROMs.
A SWR mouse program should intercept service call 5 and poll the user VIA
interrupt flag register to see if a mouse was responsible for the
unrecognised interrupt. If a mouse is the source of the interrupt then the
interrupt must be cleared by reading the user VIA data register B. The
interrupt should then be processed and a return made to the operating
system. After processing an interrupt it is essential to return from SWR
with an RTS instruction (not an RTI) and with the accumulator containing
zero.
Although it is not necessary to alter the IRQ1V vector to produce a mouse
driven joystick simulator, it is necessary to alter the Osbyte indirection
vector to point into the SWR code. The vector can be altered during an
interception of the Tube system post initialisation service call, call
number &FE. This call is always issued when the Break key is pressed and,
if the contents of the registers are saved at the beginning and restored
before returning from the call, then it can be used to execute any SWR
code every time the Break key is pressed. It is better to use service call
&FE rather than service call 3 (ROM Auto-boot) because call 3 is cancelled
by the DFS and any program in a lower priority ROM socket than the DFS
will not recieve call 3 if it is trapped by the DFS. There are ways around
this problem and these have been covered in the BBC Telesoftware series
"Mastering Sideways RAM and ROM" but the easiest solution is to use
service call &FE.
The MOS vectors are in page two of memory from &200 to &235. There is also
an area of memory in page &0D known as the extended vector space (EVS)
which has a further three bytes, called an extended vector, available to
each vector. The first two bytes of an extended vector store the address
of a vectored routine if it is in a Sideways ROM and the third byte stores
the number of that ROM.
Vectored MOS routines can be revectored to point to an address in SWR.
To do this it is necessary to store the address and ROM number of the new
routine in the EVS and then change the address contained in the page &02
vector to point to an extended vector entry point in page &FF.
Each of the twenty seven MOS vectors has a vector number, n, such that the
vector can be found at location &200+(2*n). The extended vector entry
point for each vector can be found at &FF00+(3*n).
The start of the extended vector space should be found using Osbyte &A8
with X=&00 and Y=&FF. This returns the address of the first byte of the
extended vector space, V, in X and Y. In a BBC B with MOS 1.20 V=&0D9F.
The address and ROM number of the new routine must be stored in the
extended vector space starting at V+(3*n). The number 3*n can be thought
of as an offset on the first byte of the extended vector space for vector
number n.
This information has been summarised in figure 1 in which the number,
name, location, extended vector entry point (EVEP) and offset on the EVS
has been listed for all the MOS vectors.
No. Name Location EVEP EVS offset
n &200+2*n &FF00+3*n 3*n
------------------------------------------
0 USERV &200 &FF00 &00
1 BRKV &202 &FF03 &03
2 IRQ1V &204 &FF06 &06
3 IRQ2V &206 &FF09 &09
4 CLIV &208 &FF0C &0C
5 BYTEV &20A &FF0F &0F
6 WORDV &20C &FF12 &12
7 WRCHV &20E &FF15 &15
8 RDCHV &20E &FF18 &18
9 FILEV &212 &FF1B &1B
10 ARGSV &214 &FF1E &1E
11 BGETV &216 &FF21 &21
12 BPUTV &218 &FF24 &24
13 GBPBV &21A &FF27 &27
14 FINDV &21C &FF2A &2A
15 FSCV &21E &FF2D &2D
16 EVENTV &220 &FF30 &30
17 UPTV &222 &FF33 &33
18 NETV &224 &FF36 &36
19 VDUV &226 &FF39 &39
20 KEYV &228 &FF3C &3C
21 INSV &22A &FF3F &3F
22 REMV &22C &FF42 &42
23 CNPV &22E &FF45 &45
24 IND1V &230 &FF48 &48
25 IND2V &232 &FF4B &4B
26 IND3V &234 &FF4E &4E
Figure 1 The extended vector entry points and offsets
-----------------------------------------------------
You can use figure 1 to find the addresses that need to be altered to
point any vector into SWR software.
If, for example, you want to alter vector number 16, the event vector, to
point to a new SWR routine you first need to use Osbyte &A8 to find the
start of the extended vector space and store the start address in two
consecutive zero page bytes. Then, using post-indexed indirect addressing
with the EVS address stored in these two bytes and the EVS offset in the Y
register, store the address of the new routine and the ROM number of the
SWR program in the EVS. Lastly point the event vector into the SWR program
by storing the extended vector entry point for vector 16 (&FF30) in the
event vector (&220 and &221).
The coding in figure 2 has ben borrowed from the BBC Telesoftware series
"Mastering Sideways ROM and RAM" and shows how a SWR program header can
revector EVENTV to point to a new routine within the same rom image.
LDA #&A8 \ Osbyte &A8
LDX #&00
LDY #&FF
JSR &FFF4 \ find start of EVS
STX &70 \ store least sig. byte of EVS
STY &71 \ store most sig. byte of EVS
LDY #&30 \ offset on EVS for EVENTV
LDA #new MOD 256 \ least sig. byte of new routine
STA (&70),Y \ least sig. byte in EVS
INY \ increment offset for most sig. byte
LDA #new DIV 256 \ most sig. byte of new routine
STA (&70),Y \ most sig. byte in EVS
INY \ increment offset for rom number
LDA &F4 \ find rom number of new routine
STA (&70),Y \ store in EVS
LDX #&30 \ least sig. byte of EVEP for EVENTV
LDY #&FF \ most sig. byte of EVEP for EVENTV
SEI \ set interupt disable flag
STX &220 \ store EVEP in least sig. byte of EVENTV
STY &221 \ store EVEP in most sig. byte of EVENTV
CLI \ clear interupt disable flag
Figure 2 Revectoring the event vector
---------------------------------------
This technique has been used in the demonstration program SWMOUSE to
revector the Osbyte indirection vector into the SWR socket which stores
the object code produced by the program. The object code file generated by
the program needs to be loaded into unprotected Sideways RAM and, every
time the Break key is pressed, service call &FE is trapped to initialise
the User Port for use with a mouse. At the same time the Osbyte
indirection vector will be altered to point to the code labeled analogue.
The code at analogue operates in the same way as the demonstration program
in module 5 except that it uses RAM workspace in SWR. Because the
workspace is in the same SWR bank as the program, the program can not be
used from an EPROM without modification. If you want to use the program
from an EPROM, or from write protected SWR, then you will have to move the
RAM workspace into user memory.
Load the object code file SWRMICE into a high priority SWR socket
(preferably socket &0F) and press the Break key. The ADVAL(0-4) commands
will then read the mouse coordinates and buttons as if they were an
analogue joystick. You can demonstrate that it works effectivly with the
program SWTEST.
If you want to use the program SWRMICE with some commercially produced
games you will probably find that there are problems caused by some of the
'illegal' techniques used by games programmers to protect their software.
The most likely source of trouble will be that many programmers overwrite
all the MOS vectors by indirectly loading completely new pages &02 and
&0D. This is usually done to stop you copying the game by interrupting and
saving it but it does have the side effect of preventing you using a mouse
as a substitute for the joysticks. When you know what to look for it is
not too difficult to overcome this sort of problem if you think it is
worth all the trouble.
10 REM> SWMOUSE
20 DIM mcode &200
30 address=&A8 :REM: zero page workspace
40 romnumber=&F4 :REM: currently selected ROM
50 savereg=&FC :REM: interrupt accumulator save register
60 bytev=&20A :REM: Osbyte indirection vector
70 drb=&FE60 :REM: data register B
80 ddrb=&FE62 :REM: data direction register B
90 pcr=&FE6C :REM: peripheral control register
100 ifr=&FE6D :REM: interrupt flag register
110 ier=&FE6E :REM: interrupt enable register
120 osbyte=&FFF4
130 FOR pass=4 TO 6 STEP 2
140 O%=mcode
150 P%=&8000
160 [ OPT pass
170 BRK
180 BRK
190 BRK
200 JMP service \ service entry to ROM
210 EQUB &82 \ ROM type byte indicates a service entry
220 EQUB copyright MOD 256 \ copyright offset pointer
230 BRK \ binary version number
240 EQUS "Analogue mouse" \ title string
250 .copyright
260 BRK
270 EQUS "(C) Gordon Horsington 1987" \ copyright string
280 BRK \ copyright terminator
290 .service
300 CMP #&05 \ is this an unrecognised interrupt?
310 BEQ interrupt \ if it is branch to interrupt routine
320 CMP #&FE \ is this a Tube post init?
330 BNE return \ if not then return to operating system.
340 PHA \ push registers. This is a Tube post init
350 TXA \ and the registers must be unaltered when this
360 PHA \ service type is used for illegal purposes
370 TYA \ such as initialising the user port when
380 PHA \ the Break key is pressed.
390 LDA #&98 \ %10011000, ie. enable CB1/2
400 STA ier \ interrupt enable register
410 LDA pcr \ peripheral control register
420 AND #&0F \ AND with %00001111, ie clear bits 4-7
430 ORA #&50 \ OR with %01010000, ie. set bits 4 and 6
440 STA pcr \ interrupt on +ve transition, CB2 input,
\ DRB to clear
450 LDA #&00 \ user port input
460 STA ddrb \ data direction register B
470 LDA #&10 \ ADC channel select
480 LDX #&00 \ sampling disabled
490 JSR osbyte
500 LDX bytev \ Osbyte indirection vector, low byte
510 LDY bytev+1 \ Osbyte indirection vector, high byte
520 STX oldbytev \ store the original vector, low byte
530 STY oldbytev+1 \ store the original vector, high byte
540 LDA #&A8 \ read address of ROM pointer table
550 LDX #&00 \ to read X = &00
560 LDY #&FF \ to read Y = &FF
570 JSR osbyte
580 STX address \ store in zero page for indirect addressing
590 STY address+1
600 LDY #&0F \ offset to extented Osbyte vector, low byte
610 LDA #analogue MOD 256 \ address of new Osbyte routine,
\ low byte
620 STA (address),Y \ store in extended vector
630 INY \ offset to extended Osbyte vector, high byte
640 LDA #analogue DIV 256 \ address of new Osbyte routine,
\ high byte
650 STA (address),Y \ store in extended vector
660 INY \ offset to Osbyte extended vector, ROM number
670 LDA romnumber \ load the number of this ROM
680 STA (address),Y \ store in extended vector
690 LDX #&0F \ offset to Osbyte entry to extended vectors,
\ low byte
700 LDY #&FF \ extended vector entry, high byte
710 STX bytev \ alter Osbyte vector, low byte
720 STY bytev+1 \ alter Osbyte vector, high byte
730 PLA \ restore the registers.
740 TAY \ this is an illegal use for service type &FE
750 PLA \ the A, X and Y registers must be restored
760 TAX \ before return to the operating system.
770 PLA
780 .return
790 RTS
800 .interrupt
810 LDA savereg \ interrupt accumulator save register
820 PHA \ and push it on the stack
830 LDA ifr \ interrupt flag register
840 BPL notuser \ bit 7 is set if VIA-B interrupt
850 AND #&18 \ AND with %00011000, ie. test bits 3 and 4
860 BEQ notuser \ exit if not CB1 or CB2
870 AND #&10 \ AND with %00010000, ie. test CB1
880 BNE xpulse \ bit 4 set for an X direction movement
890 LDA drb \ Y direction, load data register B
900 AND #&04 \ AND with %00000100, ie. test bit 2
910 BNE ydown \ if bit 2 is set then Y is going down
920 INC ycoord \ Y is going up so increment Y coordinate
930 BNE exit \ branch if in the range 1 to 255
940 BEQ decy \ if zero then alter to 255
950 .ydown
960 LDA ycoord \ load Y coordinate
970 BEQ exit \ branch if zero because it can't go
\ any lower
980 .decy
990 DEC ycoord \ reduce Y coordinate by 1
1000 JMP exit \ restore interrupt accumulator save
\ register and RTI
1010 .xpulse
1020 LDA drb \ load data register B
1030 ROR A \ bit 0 into carry
1040 BCC xdown \ fudge to reverse joystick
1050 INC xcoord \ fudge to increase X when its going down
1060 BNE exit \ exit if X coordinate is in the range
\ from 1 to 255
1070 BEQ decx \ if X coordinate = 0 then make it 255
1080 .xdown
1090 LDA xcoord \ load X coordinate
1100 BEQ exit \ if it is zero it can't go any lower
1110 .decx
1120 DEC xcoord \ decrease X coordinate by 1
1130 .exit
1140 PLA \ pull interrupt accumulator save register
\ off the stack
1150 STA savereg \ and restore zero page
1160 LDA #&00
1170 RTS
1180 .notuser
1190 PLA \ pull the interrupt accumulator save
\ register off the stack
1200 STA savereg \ restore the zero page address
1210 LDA #&05 \ service type 5
1220 RTS \ return to operating system
1230 .oldadval
1240 PLP \ pull status register
1250 .original
1260 JMP (oldbytev) \ exit via original Osbyte vector
1270 .analogue
1280 PHP \ push the status register
1290 CMP #&80 \ is this Osbyte &80, read ADC channel
1300 BNE oldadval \ if not exit via original Osbyte vector
1310 CPX #&00 \ is this ADVAL(0) ie. read fire buttons?
1320 BEQ firebuttons \ if it is branch to new fire buttons
\ routine
1330 TXA \ channel number is in X register
1340 ROR A \ bit 0 of channel number into carry
1350 LDA ycoord \ Y coordinate from mouse movement
1360 BCC skipxcoord \ carry clear if channel 2 or 4
1370 LDA xcoord \ X coordinate from mouse movement
1380 .skipxcoord
1390 TAY \ simulated ADVAL(1-4), high byte
1400 AND #&F0 \ AND with %11110000, ie. clear bits 0-3
1410 TAX \ simulated ADVAL(1-4), low byte
1420 LDA #&80 \ Osbyte &80
1430 PLP \ restore status register
1440 RTS \ return to BASIC
1450 .firebuttons
1460 JSR original \ perform the original ADVAL(0)
1470 TXA \ result in bits 0 and 1 of the X register
1480 PHA \ push the result onto stack
1490 LDA drb \ data register B
1500 ROL A \ bit 7 into carry
1510 BCC right \ bit 7 clear if right button pressed
1520 ROL A \ bit 6 into carry
1530 BCC centre \ bit 6 clear if centre button pressed
1540 ROL A \ bit 5 into carry
1550 BCS nopress \ if bit 5 set then no mouse buttons pressed
1560 PLA \ left button pressed, pull result of
\ original ADVAL(0)
1570 ORA #&01 \ set bit 0 to simulate fire button pressed
1580 BNE getout \ unconditional branch to exit
1590 .right
1600 PLA \ pull result of original ADVAL(0)
1610 ORA #&02 \ set bit 1 to simulate fire button pressed
1620 BNE getout \ unconditional branch to exit
1630 .centre
1640 PLA \ pull result of original ADVAL(0)
1650 ORA #&03 \ set bits 0 and 1 to simulate both fire
\ buttons
1660 BNE getout \ unconditional branch
1670 .nopress
1680 PLA \ pull the result byte off the stack
1690 .getout
1700 TAX \ transfer result byte to the X register
1710 LDA #&80 \ Osbyte &80
1720 PLP \ pull the status register
1730 RTS \ return to BASIC
1740 .xcoord
1750 EQUB &80 \ mouse X coordinate 0-255
1760 .ycoord
1770 EQUB &80 \ mouse Y coordinate 0-255
1780 .oldbytev
1790 EQUW &00 \ original Osbyte indirection vector
1800 .lastbyte
1810 ]
1820 NEXT
1830 *OPT1,2
1840 OSCLI("SAVE SWRMICE "+STR$~(mcode)+" + "+
STR$~(lastbyte-&8000)+" FFFF8000 FFFF8000")
1850 *OPT0,0
10 REM> SWTEST
20 MODE7
30 mouse$=CHR$141+CHR$132+CHR$157+CHR$131+
"SWR Mouse coords via ADVAL(0-4) "+CHR$156
40 PRINTTAB(0,5)mouse$
50 PRINTTAB(0,6)mouse$
60 ONERROR VDU23,1,1;0;0;0;31,0,23:END
70 VDU23,1,0;0;0;0;
80 REPEAT
90 adval=ADVAL(0)AND3
100 PRINTTAB(10,11)"ADVAL(0)AND3 = ";adval
110 IF adval=2 PRINTTAB(22,15)"Right" ELSE PRINTTAB(22,15)" "
120 IF adval=3 PRINTTAB(16,15)"Both" ELSE PRINTTAB(16,15)" "
130 IF adval=1 PRINTTAB(10,15)"Left" ELSE PRINTTAB(10,15)" "
140 PRINTTAB(2,20)"ADVAL(1) = ";ADVAL(1);" "
TAB(22,20)"ADVAL(2) = ";ADVAL(2);" "
150 PRINTTAB(2,22)"ADVAL(3) = ";ADVAL(1);" "
TAB(22,22)"ADVAL(4) = ";ADVAL(4);" "
160 UNTIL FALSE
170 VDU23,1,1;0;0;0;31,0,23
180 END
00000000 55 73 69 6e 67 20 61 20 6d 6f 75 73 65 20 77 69 |Using a mouse wi|
00000010 74 68 20 74 68 65 20 42 42 43 20 6d 69 63 72 6f |th the BBC micro|
00000020 63 6f 6d 70 75 74 65 72 20 2d 20 62 79 20 2d 20 |computer - by - |
00000030 47 6f 72 64 6f 6e 20 48 6f 72 73 69 6e 67 74 6f |Gordon Horsingto|
00000040 6e 0d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |n.--------------|
00000050 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
*
00000080 2d 2d 2d 0d 0d 4d 6f 64 75 6c 65 20 36 2e 20 53 |---..Module 6. S|
00000090 69 64 65 77 61 79 73 20 52 41 4d 20 28 53 57 52 |ideways RAM (SWR|
000000a0 29 20 6d 6f 75 73 65 20 73 6f 66 74 77 61 72 65 |) mouse software|
000000b0 0d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |.---------------|
000000c0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------|
000000d0 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 0d 0d 54 68 |------------..Th|
000000e0 65 20 64 65 6d 6f 6e 73 74 72 61 74 69 6f 6e 20 |e demonstration |
000000f0 70 72 6f 67 72 61 6d 20 75 73 65 64 20 69 6e 20 |program used in |
00000100 6d 6f 64 75 6c 65 20 35 20 63 61 6e 20 62 65 20 |module 5 can be |
00000110 61 6c 74 65 72 65 64 20 74 6f 20 72 75 6e 20 66 |altered to run f|
00000120 72 6f 6d 0d 53 69 64 65 77 61 79 73 20 52 41 4d |rom.Sideways RAM|
00000130 2e 20 55 6e 72 65 63 6f 67 6e 69 73 65 64 20 49 |. Unrecognised I|
00000140 52 51 20 69 6e 74 65 72 72 75 70 74 73 20 61 72 |RQ interrupts ar|
00000150 65 20 66 69 72 73 74 20 6f 66 66 65 72 65 64 20 |e first offered |
00000160 74 6f 20 74 68 65 20 70 61 67 65 64 0d 52 4f 4d |to the paged.ROM|
00000170 73 20 61 6e 64 20 74 68 65 6e 20 74 6f 20 74 68 |s and then to th|
00000180 65 20 75 73 65 72 20 76 69 61 20 74 68 65 20 49 |e user via the I|
00000190 52 51 32 20 76 65 63 74 6f 72 2e 20 41 6e 20 75 |RQ2 vector. An u|
000001a0 6e 70 72 6f 63 65 73 73 65 64 20 6d 6f 75 73 65 |nprocessed mouse|
000001b0 0d 69 6e 74 65 72 72 75 70 74 20 77 69 6c 6c 20 |.interrupt will |
000001c0 61 6c 77 61 79 73 20 62 65 20 6f 66 66 65 72 65 |always be offere|
000001d0 64 20 74 6f 20 74 68 65 20 70 61 67 65 64 20 52 |d to the paged R|
000001e0 4f 4d 73 20 61 6e 64 20 69 74 20 63 61 6e 20 74 |OMs and it can t|
000001f0 68 65 72 65 66 6f 72 65 20 62 65 0d 70 72 6f 63 |herefore be.proc|
00000200 65 73 73 65 64 20 69 6e 20 53 57 52 20 77 69 74 |essed in SWR wit|
00000210 68 6f 75 74 20 68 61 76 69 6e 67 20 74 6f 20 72 |hout having to r|
00000220 65 76 65 63 74 6f 72 20 49 52 51 31 56 2e 0d 0d |evector IRQ1V...|
00000230 53 65 72 76 69 63 65 20 63 61 6c 6c 20 35 20 69 |Service call 5 i|
00000240 73 20 75 73 65 64 20 74 6f 20 6f 66 66 65 72 20 |s used to offer |
00000250 75 6e 72 65 63 6f 67 6e 69 73 65 64 20 69 6e 74 |unrecognised int|
00000260 65 72 72 75 70 74 73 20 74 6f 20 74 68 65 20 70 |errupts to the p|
00000270 61 67 65 64 20 52 4f 4d 73 2e 0d 41 20 53 57 52 |aged ROMs..A SWR|
00000280 20 6d 6f 75 73 65 20 70 72 6f 67 72 61 6d 20 73 | mouse program s|
00000290 68 6f 75 6c 64 20 69 6e 74 65 72 63 65 70 74 20 |hould intercept |
000002a0 73 65 72 76 69 63 65 20 63 61 6c 6c 20 35 20 61 |service call 5 a|
000002b0 6e 64 20 70 6f 6c 6c 20 74 68 65 20 75 73 65 72 |nd poll the user|
000002c0 20 56 49 41 0d 69 6e 74 65 72 72 75 70 74 20 66 | VIA.interrupt f|
000002d0 6c 61 67 20 72 65 67 69 73 74 65 72 20 74 6f 20 |lag register to |
000002e0 73 65 65 20 69 66 20 61 20 6d 6f 75 73 65 20 77 |see if a mouse w|
000002f0 61 73 20 72 65 73 70 6f 6e 73 69 62 6c 65 20 66 |as responsible f|
00000300 6f 72 20 74 68 65 0d 75 6e 72 65 63 6f 67 6e 69 |or the.unrecogni|
00000310 73 65 64 20 69 6e 74 65 72 72 75 70 74 2e 20 49 |sed interrupt. I|
00000320 66 20 61 20 6d 6f 75 73 65 20 69 73 20 74 68 65 |f a mouse is the|
00000330 20 73 6f 75 72 63 65 20 6f 66 20 74 68 65 20 69 | source of the i|
00000340 6e 74 65 72 72 75 70 74 20 74 68 65 6e 20 74 68 |nterrupt then th|
00000350 65 0d 69 6e 74 65 72 72 75 70 74 20 6d 75 73 74 |e.interrupt must|
00000360 20 62 65 20 63 6c 65 61 72 65 64 20 62 79 20 72 | be cleared by r|
00000370 65 61 64 69 6e 67 20 74 68 65 20 75 73 65 72 20 |eading the user |
00000380 56 49 41 20 64 61 74 61 20 72 65 67 69 73 74 65 |VIA data registe|
00000390 72 20 42 2e 20 54 68 65 0d 69 6e 74 65 72 72 75 |r B. The.interru|
000003a0 70 74 20 73 68 6f 75 6c 64 20 74 68 65 6e 20 62 |pt should then b|
000003b0 65 20 70 72 6f 63 65 73 73 65 64 20 61 6e 64 20 |e processed and |
000003c0 61 20 72 65 74 75 72 6e 20 6d 61 64 65 20 74 6f |a return made to|
000003d0 20 74 68 65 20 6f 70 65 72 61 74 69 6e 67 0d 73 | the operating.s|
000003e0 79 73 74 65 6d 2e 20 41 66 74 65 72 20 70 72 6f |ystem. After pro|
000003f0 63 65 73 73 69 6e 67 20 61 6e 20 69 6e 74 65 72 |cessing an inter|
00000400 72 75 70 74 20 69 74 20 69 73 20 65 73 73 65 6e |rupt it is essen|
00000410 74 69 61 6c 20 74 6f 20 72 65 74 75 72 6e 20 66 |tial to return f|
00000420 72 6f 6d 20 53 57 52 0d 77 69 74 68 20 61 6e 20 |rom SWR.with an |
00000430 52 54 53 20 69 6e 73 74 72 75 63 74 69 6f 6e 20 |RTS instruction |
00000440 28 6e 6f 74 20 61 6e 20 52 54 49 29 20 61 6e 64 |(not an RTI) and|
00000450 20 77 69 74 68 20 74 68 65 20 61 63 63 75 6d 75 | with the accumu|
00000460 6c 61 74 6f 72 20 63 6f 6e 74 61 69 6e 69 6e 67 |lator containing|
00000470 0d 7a 65 72 6f 2e 0d 0d 41 6c 74 68 6f 75 67 68 |.zero...Although|
00000480 20 69 74 20 69 73 20 6e 6f 74 20 6e 65 63 65 73 | it is not neces|
00000490 73 61 72 79 20 74 6f 20 61 6c 74 65 72 20 74 68 |sary to alter th|
000004a0 65 20 49 52 51 31 56 20 76 65 63 74 6f 72 20 74 |e IRQ1V vector t|
000004b0 6f 20 70 72 6f 64 75 63 65 20 61 20 6d 6f 75 73 |o produce a mous|
000004c0 65 0d 64 72 69 76 65 6e 20 6a 6f 79 73 74 69 63 |e.driven joystic|
000004d0 6b 20 73 69 6d 75 6c 61 74 6f 72 2c 20 69 74 20 |k simulator, it |
000004e0 69 73 20 6e 65 63 65 73 73 61 72 79 20 74 6f 20 |is necessary to |
000004f0 61 6c 74 65 72 20 74 68 65 20 4f 73 62 79 74 65 |alter the Osbyte|
00000500 20 69 6e 64 69 72 65 63 74 69 6f 6e 0d 76 65 63 | indirection.vec|
00000510 74 6f 72 20 74 6f 20 70 6f 69 6e 74 20 69 6e 74 |tor to point int|
00000520 6f 20 74 68 65 20 53 57 52 20 63 6f 64 65 2e 20 |o the SWR code. |
00000530 54 68 65 20 76 65 63 74 6f 72 20 63 61 6e 20 62 |The vector can b|
00000540 65 20 61 6c 74 65 72 65 64 20 64 75 72 69 6e 67 |e altered during|
00000550 20 61 6e 0d 69 6e 74 65 72 63 65 70 74 69 6f 6e | an.interception|
00000560 20 6f 66 20 74 68 65 20 54 75 62 65 20 73 79 73 | of the Tube sys|
00000570 74 65 6d 20 70 6f 73 74 20 69 6e 69 74 69 61 6c |tem post initial|
00000580 69 73 61 74 69 6f 6e 20 73 65 72 76 69 63 65 20 |isation service |
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000048b0 55 32 33 2c 31 2c 30 3b 30 3b 30 3b 30 3b 0d 20 |U23,1,0;0;0;0;. |
000048c0 20 20 38 30 20 52 45 50 45 41 54 0d 20 20 20 39 | 80 REPEAT. 9|
000048d0 30 20 61 64 76 61 6c 3d 41 44 56 41 4c 28 30 29 |0 adval=ADVAL(0)|
000048e0 41 4e 44 33 0d 20 20 31 30 30 20 50 52 49 4e 54 |AND3. 100 PRINT|
000048f0 54 41 42 28 31 30 2c 31 31 29 22 41 44 56 41 4c |TAB(10,11)"ADVAL|
00004900 28 30 29 41 4e 44 33 20 3d 20 22 3b 61 64 76 61 |(0)AND3 = ";adva|
00004910 6c 0d 20 20 31 31 30 20 49 46 20 61 64 76 61 6c |l. 110 IF adval|
00004920 3d 32 20 50 52 49 4e 54 54 41 42 28 32 32 2c 31 |=2 PRINTTAB(22,1|
00004930 35 29 22 52 69 67 68 74 22 20 45 4c 53 45 20 50 |5)"Right" ELSE P|
00004940 52 49 4e 54 54 41 42 28 32 32 2c 31 35 29 22 20 |RINTTAB(22,15)" |
00004950 20 20 20 20 22 0d 20 20 31 32 30 20 49 46 20 61 | ". 120 IF a|
00004960 64 76 61 6c 3d 33 20 20 50 52 49 4e 54 54 41 42 |dval=3 PRINTTAB|
00004970 28 31 36 2c 31 35 29 22 42 6f 74 68 22 20 45 4c |(16,15)"Both" EL|
00004980 53 45 20 50 52 49 4e 54 54 41 42 28 31 36 2c 31 |SE PRINTTAB(16,1|
00004990 35 29 22 20 20 20 20 22 0d 20 20 31 33 30 20 49 |5)" ". 130 I|
000049a0 46 20 61 64 76 61 6c 3d 31 20 50 52 49 4e 54 54 |F adval=1 PRINTT|
000049b0 41 42 28 31 30 2c 31 35 29 22 4c 65 66 74 22 20 |AB(10,15)"Left" |
000049c0 45 4c 53 45 20 50 52 49 4e 54 54 41 42 28 31 30 |ELSE PRINTTAB(10|
000049d0 2c 31 35 29 22 20 20 20 20 22 0d 20 20 31 34 30 |,15)" ". 140|
000049e0 20 50 52 49 4e 54 54 41 42 28 32 2c 32 30 29 22 | PRINTTAB(2,20)"|
000049f0 41 44 56 41 4c 28 31 29 20 3d 20 22 3b 41 44 56 |ADVAL(1) = ";ADV|
00004a00 41 4c 28 31 29 3b 22 20 20 20 20 22 0d 20 20 20 |AL(1);" ". |
00004a10 20 20 20 54 41 42 28 32 32 2c 32 30 29 22 41 44 | TAB(22,20)"AD|
00004a20 56 41 4c 28 32 29 20 3d 20 22 3b 41 44 56 41 4c |VAL(2) = ";ADVAL|
00004a30 28 32 29 3b 22 20 20 20 20 22 0d 20 20 31 35 30 |(2);" ". 150|
00004a40 20 50 52 49 4e 54 54 41 42 28 32 2c 32 32 29 22 | PRINTTAB(2,22)"|
00004a50 41 44 56 41 4c 28 33 29 20 3d 20 22 3b 41 44 56 |ADVAL(3) = ";ADV|
00004a60 41 4c 28 31 29 3b 22 20 20 20 20 22 0d 20 20 20 |AL(1);" ". |
00004a70 20 20 20 54 41 42 28 32 32 2c 32 32 29 22 41 44 | TAB(22,22)"AD|
00004a80 56 41 4c 28 34 29 20 3d 20 22 3b 41 44 56 41 4c |VAL(4) = ";ADVAL|
00004a90 28 34 29 3b 22 20 20 20 20 22 0d 20 20 31 36 30 |(4);" ". 160|
00004aa0 20 55 4e 54 49 4c 20 46 41 4c 53 45 0d 20 20 31 | UNTIL FALSE. 1|
00004ab0 37 30 20 56 44 55 32 33 2c 31 2c 31 3b 30 3b 30 |70 VDU23,1,1;0;0|
00004ac0 3b 30 3b 33 31 2c 30 2c 32 33 0d 20 20 31 38 30 |;0;31,0,23. 180|
00004ad0 20 45 4e 44 0d | END.|
00004ad5 
07-01-88/T\MOU06.m0
07-01-88/T\MOU06.m1
07-01-88/T\MOU06.m2
07-01-88/T\MOU06.m4
07-01-88/T\MOU06.m5
.