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Sound/Demo1
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 » Archimedes archive » Archimedes World » AW-1996-06-Disc 1.adf » !AcornAns_AcornAns |
| Filename: | Sound/Demo1 |
| Read OK: | ✔ |
| File size: | 12F1 bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
Duplicates
There is 1 duplicate copy of this file in the archive:
- Archimedes archive » Archimedes World » AW-1996-07.adf » !AcornAns_AcornAns » Sound/Demo1
- Archimedes archive » Archimedes World » AW-1996-06-Disc 1.adf » !AcornAns_AcornAns » Sound/Demo1
File contents
10REM >Demo1
20REM
30REM Demo of how to add a new voice generator
40REM Mostly copyright Acorn (see PRM 4.74-4.76)
50REM
60REM NB Strongly recommend you connect the headphone socket
70REM on the computer to a hi-fi amplifier or at the very
80REM least to a pair of headphones.
90REM The computer's own internal speaker/s are poor, quiet
100REM and don't reproduce low frequency sounds well.
110REM
120:
130DIM WaveTable% 255, Code% 4095
140:
150REM First we build our sample at full volume
160SYS "Sound_Volume", 127 TO UserVolume%
170FOR s%=0 TO 255
180 SYS "Sound_SoundLog", &7fffffff*SIN(2*PI*s%/256) TO WaveTable%?s%
190NEXT
200SYS "Sound_Volume", UserVolume%
210:
220FOR pass%=0 TO 2 STEP 2
230P%=Code%
240[ OPT pass%
250 :
260.VoiceBase%
270 B Fill%
280 B Fill%
290 B GateOn%
300 B GateOff%
310 B Instance%
320 LDMFD 13!, {PC}
330 LDMFD 13!, {PC}
340 EQUD VoiceName%-VoiceBase%
350.VoiceName%
360 EQUS "WaveVoice"
370 EQUB 0
380 ALIGN
390 :
400.LogAmpPtr%
410 EQUD 0
420.WaveBase%
430 EQUD WaveTable%
440 :
450 : ;instantiation code -
460 : ;called when voice attached to a channel
470 : ;SVC mode in use
480 : ; r0 is physical channel # - 1 (0-7)
490.Instance%
500 STMFD 13!, {0-4} ;all we do is note where the log amp
510 MOV 0, #0 ;table is for use by buffer fill routines
520 MOV 1, #0
530 MOV 2, #0
540 MOV 3, #0
550 MOV 4, #0
560 SWI "XSound_Configure"
570 LDRVC 0, [3, #12]
580 STRVC 0, LogAmpPtr% ;ptr to volume scaled log amplitude table
590 STRVS 0, [13] ;scaling log channel amp by overall vol
600 LDMFD 13!, {0-4, PC}
610 :
620 : ;buffer fill routines -
630 : ;code must be re-entrant & is called in
640 : ;IRQ mode with interrupts enabled
650 : ;(hence r14 not usable)
660 : ; r0-r8 available
670 : ; r9 is SCCB ptr
680 : ; r10 DMA buffer limit + 1
690 : ; r11 DMA buffer interleaf increment
700 : ; r12 DMA buffer base ptr
710 : ; r13 Sound system stack
720 :
730.GateOn% ;called when a sound is initialised
740 LDR 0, WaveBase%
750 STR 0, [9, #16] ;set up as work reg 5
760 LDR 0, LogAmpPtr%
770 STR 0, [9, #20] ;set up as work reg 6
780 :
790.Fill% ;called during sounding or when starting
800 LDMIA 9, {1-6} ;a new sound smoothly
810 AND 1, 1, #&7f
820 ; r1 log amp (0-127), r2 pitch phase acc
830 ; r3 timbre phase acc, r4 duration
840 ; r5 wavetable base, r6 amp table base
850 ;convert r1 -> VIDC format log amp
860 ;(has sign bit in b0) and then get
870 LDRB 1, [6, 1, LSL #1] ;log amp scaled by overall volume
880 MOV 1, 1, LSR #1 ;now move sign bit back
890 RSB 1, 1, #127
900.FillLoop%
910 ADD 2, 2, 2, LSL #16 ;advance waveform phase
920 LDRB 0, [5, 2, LSR #24] ;get wave sample
930 SUBS 0, 0, 1, LSL #1 ;scale amp by channel & overall vol
940 MOVMI 0, #0 ;correct for underflow
950 STRB 0, [12], 11 ;generate output
960 ADD 2, 2, 2, LSL #16 ;repeat in line once more
970 LDRB 0, [5, 2, LSR #24]
980 SUBS 0, 0, 1, LSL #1
990 MOVMI 0, #0
1000 STRB 0, [12], 11
1010 CMP 12, 10
1020 BLT FillLoop% ;loop if not buffer full
1030 :
1040 SUBS 4, 4, #1 ;decrement centisec count
1050 STMIB 9, {2-5} ;save registers back to SCCB
1060 MOVPL 0, #%00001000 ;voice active if still duration left
1070 MOVMI 0, #%00000010 ;else force flush
1080 LDMFD 13!, {PC}
1090 :
1100.GateOff% ;called to end sounding of a note
1110 MOV 0, #0
1120.FlushLoop%
1130 STRB 0, [12], 11
1140 STRB 0, [12], 11
1150 CMP 12, 10
1160 BLT FlushLoop%
1170 MOV 0, #%00000001 ;set flag to flush one more buffer
1180 LDMFD 13!, {PC}
1190]
1200NEXT
1210:
1220DIM OldVoice%(8)
1230SYS "Sound_InstallVoice", VoiceBase%,0 TO ,Voice%
1240FOR v%=1 TO 8
1250 SYS "Sound_AttachVoice", v%, Voice% TO ,OldVoice%(v%)
1260NEXT
1270:
1280ON ERROR PROCRestoreSound:END
1290:
1300SYS "Sound_Configure", 8
1310*Voices
1320SOUND 1, &17F, 53, 10
1330PRINT''"any key to make a noise, <ESCAPE> to finish"
1340:
1350C%=1
1360REPEAT
1370 K%=INKEY(1)
1380 IF K%>0 THEN
1390 PRINT STR$K%;" ";
1400 SOUND C%, &17F, K%, 100
1410 C%+=1:IF C%>8 C%=1
1420 ENDIF
1430UNTIL 0
1440:
1450DEF PROCRestoreSound
1460 ON ERROR OFF
1470 REPORT:PRINT ERL
1480 SYS "Sound_RemoveVoice",,Voice%
1490 FOR v%=1 TO 8
1500 SYS "Sound_AttachVoice", v%, OldVoice%(v%)
1510 NEXT
1520SYS "Sound_Configure", 1
1530*Voices
1540PRINT''
1550ENDPROC
� >Demo1
�
.� Demo of how to add a new voice generator
(0� Mostly copyright Acorn (see PRM 4.74-4.76)
2�
<<� NB Strongly recommend you connect the headphone socket
F<� on the computer to a hi-fi amplifier or at the very
P'� least to a pair of headphones.
Z>� The computer's own internal speaker/s are poor, quiet
d7� and don't reproduce low frequency sounds well.
n�
x:
� � WaveTable% 255, Code% 4095
�:
�.� First we build our sample at full volume
�(ș "Sound_Volume", 127 � UserVolume%
�� s%=0 � 255
�A ș "Sound_SoundLog", &7fffffff*�(2*�*s%/256) � WaveTable%?s%
��
�"ș "Sound_Volume", UserVolume%
�:
�� pass%=0 � 2 � 2
� P%=Code%
�[ OPT pass%
� :
.VoiceBase%
B Fill%
B Fill%
" B GateOn%
, B GateOff%
6 B Instance%
@ LDMFD 13!, {PC}
J LDMFD 13!, {PC}
T# EQUD VoiceName%-VoiceBase%
^.VoiceName%
h EQUS "WaveVoice"
r EQUB 0
|
ALIGN
� :
�.LogAmpPtr%
� EQUD 0
�.WaveBase%
� EQUD WaveTable%
� :
�2 : ;instantiation code -
�E : ;called when voice attached to a channel
�- : ;SVC mode in use
�B : ; r0 is physical channel # - 1 (0-7)
�.Instance%
�A STMFD 13!, {0-4} ;all we do is note where the log amp
�F MOV 0, #0 ;table is for use by buffer fill routines
MOV 1, #0
MOV 2, #0
MOV 3, #0
& MOV 4, #0
0 SWI "XSound_Configure"
: LDRVC 0, [3, #12]
DF STRVC 0, LogAmpPtr% ;ptr to volume scaled log amplitude table
ND STRVS 0, [13] ;scaling log channel amp by overall vol
X LDMFD 13!, {0-4, PC}
b :
l4 : ;buffer fill routines -
vD : ;code must be re-entrant & is called in
�> : ;IRQ mode with interrupts enabled
�4 : ;(hence r14 not usable)
�. : ; r0-r8 available
�. : ; r9 is SCCB ptr
�7 : ; r10 DMA buffer limit + 1
�A : ; r11 DMA buffer interleaf increment
�6 : ; r12 DMA buffer base ptr
�5 : ; r13 Sound system stack
� :
�@.GateOn% ;called when a sound is initialised
� LDR 0, WaveBase%
�2 STR 0, [9, #16] ;set up as work reg 5
� LDR 0, LogAmpPtr%
2 STR 0, [9, #20] ;set up as work reg 6
:
E.Fill% ;called during sounding or when starting
2 LDMIA 9, {1-6} ;a new sound smoothly
* � 1, 1, #&7f
4F ; r1 log amp (0-127), r2 pitch phase acc
>? ; r3 timbre phase acc, r4 duration
HE ; r5 wavetable base, r6 amp table base
RD ;convert r1 -> VIDC format log amp
\D ;(has sign bit in b0) and then get
fC LDRB 1, [6, 1, LSL #1] ;log amp scaled by overall volume
p9 MOV 1, 1, LSR #1 ;now move sign bit back
z RSB 1, 1, #127
�.FillLoop%
�9 ADD 2, 2, 2, LSL #16 ;advance waveform phase
�2 LDRB 0, [5, 2, LSR #24] ;get wave sample
�E SUBS 0, 0, 1, LSL #1 ;scale amp by channel & overall vol
�8 MOVMI 0, #0 ;correct for underflow
�2 STRB 0, [12], 11 ;generate output
�; ADD 2, 2, 2, LSL #16 ;repeat in line once more
� LDRB 0, [5, 2, LSR #24]
� SUBS 0, 0, 1, LSL #1
� MOVMI 0, #0
� STRB 0, [12], 11
� CMP 12, 10
�: BLT FillLoop% ;loop if not buffer full
:
; SUBS 4, 4, #1 ;decrement centisec count
> STMIB 9, {2-5} ;save registers back to SCCB
$F MOVPL 0, #%00001000 ;voice active if still duration left
.3 MOVMI 0, #%00000010 ;else force flush
8 LDMFD 13!, {PC}
B :
LC.GateOff% ;called to end sounding of a note
V MOV 0, #0
`.FlushLoop%
j STRB 0, [12], 11
t STRB 0, [12], 11
~ CMP 12, 10
� BLT FlushLoop%
�D MOV 0, #%00000001 ;set flag to flush one more buffer
� LDMFD 13!, {PC}
�]
��
�:
�� OldVoice%(8)
�3ș "Sound_InstallVoice", VoiceBase%,0 � ,Voice%
�� v%=1 � 8
�8 ș "Sound_AttachVoice", v%, Voice% � ,OldVoice%(v%)
��
�:
� � �RestoreSound:�
:
ș "Sound_Configure", 8
*Voices
(� 1, &17F, 53, 10
24�''"any key to make a noise, <ESCAPE> to finish"
<:
FC%=1
P�
Z K%=�(1)
d
� K%>0 �
n � �K%;" ";
x � C%, &17F, K%, 100
� C%+=1:� C%>8 C%=1
� �
�� 0
�:
�� �RestoreSound
�
� � �
�
�:� �
�# ș "Sound_RemoveVoice",,Voice%
� � v%=1 � 8
�/ ș "Sound_AttachVoice", v%, OldVoice%(v%)
� �
�ș "Sound_Configure", 1
� *Voices
�''
�
� 00000000 0d 00 0a 0c f4 20 3e 44 65 6d 6f 31 0d 00 14 05 |..... >Demo1....|
00000010 f4 0d 00 1e 2e f4 20 44 65 6d 6f 20 6f 66 20 68 |...... Demo of h|
00000020 6f 77 20 74 6f 20 61 64 64 20 61 20 6e 65 77 20 |ow to add a new |
00000030 76 6f 69 63 65 20 67 65 6e 65 72 61 74 6f 72 0d |voice generator.|
00000040 00 28 30 f4 20 4d 6f 73 74 6c 79 20 63 6f 70 79 |.(0. Mostly copy|
00000050 72 69 67 68 74 20 41 63 6f 72 6e 20 28 73 65 65 |right Acorn (see|
00000060 20 50 52 4d 20 34 2e 37 34 2d 34 2e 37 36 29 0d | PRM 4.74-4.76).|
00000070 00 32 05 f4 0d 00 3c 3c f4 20 4e 42 20 53 74 72 |.2....<<. NB Str|
00000080 6f 6e 67 6c 79 20 72 65 63 6f 6d 6d 65 6e 64 20 |ongly recommend |
00000090 79 6f 75 20 63 6f 6e 6e 65 63 74 20 74 68 65 20 |you connect the |
000000a0 68 65 61 64 70 68 6f 6e 65 20 73 6f 63 6b 65 74 |headphone socket|
000000b0 0d 00 46 3c f4 20 20 20 20 6f 6e 20 74 68 65 20 |..F<. on the |
000000c0 63 6f 6d 70 75 74 65 72 20 74 6f 20 61 20 68 69 |computer to a hi|
000000d0 2d 66 69 20 61 6d 70 6c 69 66 69 65 72 20 6f 72 |-fi amplifier or|
000000e0 20 61 74 20 74 68 65 20 76 65 72 79 0d 00 50 27 | at the very..P'|
000000f0 f4 20 20 20 20 6c 65 61 73 74 20 74 6f 20 61 20 |. least to a |
00000100 70 61 69 72 20 6f 66 20 68 65 61 64 70 68 6f 6e |pair of headphon|
00000110 65 73 2e 0d 00 5a 3e f4 20 20 20 20 54 68 65 20 |es...Z>. The |
00000120 63 6f 6d 70 75 74 65 72 27 73 20 6f 77 6e 20 69 |computer's own i|
00000130 6e 74 65 72 6e 61 6c 20 73 70 65 61 6b 65 72 2f |nternal speaker/|
00000140 73 20 61 72 65 20 70 6f 6f 72 2c 20 71 75 69 65 |s are poor, quie|
00000150 74 0d 00 64 37 f4 20 20 20 20 61 6e 64 20 64 6f |t..d7. and do|
00000160 6e 27 74 20 72 65 70 72 6f 64 75 63 65 20 6c 6f |n't reproduce lo|
00000170 77 20 66 72 65 71 75 65 6e 63 79 20 73 6f 75 6e |w frequency soun|
00000180 64 73 20 77 65 6c 6c 2e 0d 00 6e 05 f4 0d 00 78 |ds well...n....x|
00000190 05 3a 0d 00 82 20 de 20 57 61 76 65 54 61 62 6c |.:... . WaveTabl|
000001a0 65 25 20 32 35 35 2c 20 43 6f 64 65 25 20 34 30 |e% 255, Code% 40|
000001b0 39 35 0d 00 8c 05 3a 0d 00 96 2e f4 20 46 69 72 |95....:..... Fir|
000001c0 73 74 20 77 65 20 62 75 69 6c 64 20 6f 75 72 20 |st we build our |
000001d0 73 61 6d 70 6c 65 20 61 74 20 66 75 6c 6c 20 76 |sample at full v|
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000001f0 6e 64 5f 56 6f 6c 75 6d 65 22 2c 20 31 32 37 20 |nd_Volume", 127 |
00000200 b8 20 55 73 65 72 56 6f 6c 75 6d 65 25 0d 00 aa |. UserVolume%...|
00000210 10 e3 20 73 25 3d 30 20 b8 20 32 35 35 0d 00 b4 |.. s%=0 . 255...|
00000220 41 20 c8 99 20 22 53 6f 75 6e 64 5f 53 6f 75 6e |A .. "Sound_Soun|
00000230 64 4c 6f 67 22 2c 20 26 37 66 66 66 66 66 66 66 |dLog", &7fffffff|
00000240 2a b5 28 32 2a af 2a 73 25 2f 32 35 36 29 20 b8 |*.(2*.*s%/256) .|
00000250 20 57 61 76 65 54 61 62 6c 65 25 3f 73 25 0d 00 | WaveTable%?s%..|
00000260 be 05 ed 0d 00 c8 22 c8 99 20 22 53 6f 75 6e 64 |......".. "Sound|
00000270 5f 56 6f 6c 75 6d 65 22 2c 20 55 73 65 72 56 6f |_Volume", UserVo|
00000280 6c 75 6d 65 25 0d 00 d2 05 3a 0d 00 dc 15 e3 20 |lume%....:..... |
00000290 70 61 73 73 25 3d 30 20 b8 20 32 20 88 20 32 0d |pass%=0 . 2 . 2.|
000002a0 00 e6 0c 50 25 3d 43 6f 64 65 25 0d 00 f0 0f 5b |...P%=Code%....[|
000002b0 20 4f 50 54 20 70 61 73 73 25 0d 00 fa 06 20 3a | OPT pass%.... :|
000002c0 0d 01 04 0f 2e 56 6f 69 63 65 42 61 73 65 25 0d |.....VoiceBase%.|
000002d0 01 0e 13 20 42 20 20 20 20 20 20 20 20 46 69 6c |... B Fil|
000002e0 6c 25 0d 01 18 13 20 42 20 20 20 20 20 20 20 20 |l%.... B |
000002f0 46 69 6c 6c 25 0d 01 22 15 20 42 20 20 20 20 20 |Fill%..". B |
00000300 20 20 20 47 61 74 65 4f 6e 25 0d 01 2c 16 20 42 | GateOn%..,. B|
00000310 20 20 20 20 20 20 20 20 47 61 74 65 4f 66 66 25 | GateOff%|
00000320 0d 01 36 17 20 42 20 20 20 20 20 20 20 20 49 6e |..6. B In|
00000330 73 74 61 6e 63 65 25 0d 01 40 17 20 4c 44 4d 46 |stance%..@. LDMF|
00000340 44 20 20 20 20 31 33 21 2c 20 7b 50 43 7d 0d 01 |D 13!, {PC}..|
00000350 4a 17 20 4c 44 4d 46 44 20 20 20 20 31 33 21 2c |J. LDMFD 13!,|
00000360 20 7b 50 43 7d 0d 01 54 23 20 45 51 55 44 20 20 | {PC}..T# EQUD |
00000370 20 20 20 56 6f 69 63 65 4e 61 6d 65 25 2d 56 6f | VoiceName%-Vo|
00000380 69 63 65 42 61 73 65 25 0d 01 5e 0f 2e 56 6f 69 |iceBase%..^..Voi|
00000390 63 65 4e 61 6d 65 25 0d 01 68 15 20 45 51 55 53 |ceName%..h. EQUS|
000003a0 20 22 57 61 76 65 56 6f 69 63 65 22 0d 01 72 0b | "WaveVoice"..r.|
000003b0 20 45 51 55 42 20 30 0d 01 7c 0a 20 41 4c 49 47 | EQUB 0..|. ALIG|
000003c0 4e 0d 01 86 06 20 3a 0d 01 90 0f 2e 4c 6f 67 41 |N.... :.....LogA|
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000003e0 30 0d 01 a4 0e 2e 57 61 76 65 42 61 73 65 25 0d |0.....WaveBase%.|
000003f0 01 ae 14 20 45 51 55 44 20 57 61 76 65 54 61 62 |... EQUD WaveTab|
00000400 6c 65 25 0d 01 b8 06 20 3a 0d 01 c2 32 20 3a 20 |le%.... :...2 : |
00000410 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00000420 20 20 20 20 20 20 3b 69 6e 73 74 61 6e 74 69 61 | ;instantia|
00000430 74 69 6f 6e 20 63 6f 64 65 20 2d 0d 01 cc 45 20 |tion code -...E |
00000440 3a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |: |
00000450 20 20 20 20 20 20 20 20 3b 63 61 6c 6c 65 64 20 | ;called |
00000460 77 68 65 6e 20 76 6f 69 63 65 20 61 74 74 61 63 |when voice attac|
00000470 68 65 64 20 74 6f 20 61 20 63 68 61 6e 6e 65 6c |hed to a channel|
00000480 0d 01 d6 2d 20 3a 20 20 20 20 20 20 20 20 20 20 |...- : |
00000490 20 20 20 20 20 20 20 20 20 20 20 20 20 3b 53 56 | ;SV|
000004a0 43 20 6d 6f 64 65 20 69 6e 20 75 73 65 0d 01 e0 |C mode in use...|
000004b0 42 20 3a 20 20 20 20 20 20 20 20 20 20 20 20 20 |B : |
000004c0 20 20 20 20 20 20 20 20 20 20 3b 20 72 30 20 20 | ; r0 |
000004d0 69 73 20 70 68 79 73 69 63 61 6c 20 63 68 61 6e |is physical chan|
000004e0 6e 65 6c 20 23 20 2d 20 31 20 28 30 2d 37 29 0d |nel # - 1 (0-7).|
000004f0 01 ea 0e 2e 49 6e 73 74 61 6e 63 65 25 0d 01 f4 |....Instance%...|
00000500 41 20 53 54 4d 46 44 20 20 20 20 31 33 21 2c 20 |A STMFD 13!, |
00000510 7b 30 2d 34 7d 20 20 20 20 20 3b 61 6c 6c 20 77 |{0-4} ;all w|
00000520 65 20 64 6f 20 69 73 20 6e 6f 74 65 20 77 68 65 |e do is note whe|
00000530 72 65 20 74 68 65 20 6c 6f 67 20 61 6d 70 0d 01 |re the log amp..|
00000540 fe 46 20 4d 4f 56 20 20 20 20 20 20 30 2c 20 23 |.F MOV 0, #|
00000550 30 20 20 20 20 20 20 20 20 20 20 3b 74 61 62 6c |0 ;tabl|
00000560 65 20 69 73 20 66 6f 72 20 75 73 65 20 62 79 20 |e is for use by |
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00000580 69 6e 65 73 0d 02 08 13 20 4d 4f 56 20 20 20 20 |ines.... MOV |
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000005a0 20 20 20 20 20 32 2c 20 23 30 0d 02 1c 13 20 4d | 2, #0.... M|
000005b0 4f 56 20 20 20 20 20 20 33 2c 20 23 30 0d 02 26 |OV 3, #0..&|
000005c0 13 20 4d 4f 56 20 20 20 20 20 20 34 2c 20 23 30 |. MOV 4, #0|
000005d0 0d 02 30 20 20 53 57 49 20 20 20 20 20 20 22 58 |..0 SWI "X|
000005e0 53 6f 75 6e 64 5f 43 6f 6e 66 69 67 75 72 65 22 |Sound_Configure"|
000005f0 0d 02 3a 19 20 4c 44 52 56 43 20 20 20 20 30 2c |..:. LDRVC 0,|
00000600 20 5b 33 2c 20 23 31 32 5d 0d 02 44 46 20 53 54 | [3, #12]..DF ST|
00000610 52 56 43 20 20 20 20 30 2c 20 4c 6f 67 41 6d 70 |RVC 0, LogAmp|
00000620 50 74 72 25 20 20 3b 70 74 72 20 74 6f 20 76 6f |Ptr% ;ptr to vo|
00000630 6c 75 6d 65 20 73 63 61 6c 65 64 20 6c 6f 67 20 |lume scaled log |
00000640 61 6d 70 6c 69 74 75 64 65 20 74 61 62 6c 65 0d |amplitude table.|
00000650 02 4e 44 20 53 54 52 56 53 20 20 20 20 30 2c 20 |.ND STRVS 0, |
00000660 5b 31 33 5d 20 20 20 20 20 20 20 20 3b 73 63 61 |[13] ;sca|
00000670 6c 69 6e 67 20 6c 6f 67 20 63 68 61 6e 6e 65 6c |ling log channel|
00000680 20 61 6d 70 20 62 79 20 6f 76 65 72 61 6c 6c 20 | amp by overall |
00000690 76 6f 6c 0d 02 58 1c 20 4c 44 4d 46 44 20 20 20 |vol..X. LDMFD |
000006a0 20 31 33 21 2c 20 7b 30 2d 34 2c 20 50 43 7d 0d | 13!, {0-4, PC}.|
000006b0 02 62 06 20 3a 0d 02 6c 34 20 3a 20 20 20 20 20 |.b. :..l4 : |
000006c0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
000006d0 20 20 3b 62 75 66 66 65 72 20 66 69 6c 6c 20 72 | ;buffer fill r|
000006e0 6f 75 74 69 6e 65 73 20 2d 0d 02 76 44 20 3a 20 |outines -..vD : |
000006f0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
00000700 20 20 20 20 20 20 3b 63 6f 64 65 20 6d 75 73 74 | ;code must|
00000710 20 62 65 20 72 65 2d 65 6e 74 72 61 6e 74 20 26 | be re-entrant &|
00000720 20 69 73 20 63 61 6c 6c 65 64 20 69 6e 0d 02 80 | is called in...|
00000730 3e 20 3a 20 20 20 20 20 20 20 20 20 20 20 20 20 |> : |
00000740 20 20 20 20 20 20 20 20 20 20 3b 49 52 51 20 6d | ;IRQ m|
00000750 6f 64 65 20 77 69 74 68 20 69 6e 74 65 72 72 75 |ode with interru|
00000760 70 74 73 20 65 6e 61 62 6c 65 64 0d 02 8a 34 20 |pts enabled...4 |
00000770 3a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |: |
00000780 20 20 20 20 20 20 20 20 3b 28 68 65 6e 63 65 20 | ;(hence |
00000790 72 31 34 20 6e 6f 74 20 75 73 61 62 6c 65 29 0d |r14 not usable).|
000007a0 02 94 2e 20 3a 20 20 20 20 20 20 20 20 20 20 20 |... : |
000007b0 20 20 20 20 20 20 20 20 20 20 20 20 3b 20 72 30 | ; r0|
000007c0 2d 72 38 20 61 76 61 69 6c 61 62 6c 65 0d 02 9e |-r8 available...|
000007d0 2e 20 3a 20 20 20 20 20 20 20 20 20 20 20 20 20 |. : |
000007e0 20 20 20 20 20 20 20 20 20 20 3b 20 72 39 20 20 | ; r9 |
000007f0 69 73 20 53 43 43 42 20 70 74 72 0d 02 a8 37 20 |is SCCB ptr...7 |
00000800 3a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |: |
00000810 20 20 20 20 20 20 20 20 3b 20 72 31 30 20 44 4d | ; r10 DM|
00000820 41 20 62 75 66 66 65 72 20 6c 69 6d 69 74 20 2b |A buffer limit +|
00000830 20 31 0d 02 b2 41 20 3a 20 20 20 20 20 20 20 20 | 1...A : |
00000840 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 3b | ;|
00000850 20 72 31 31 20 44 4d 41 20 62 75 66 66 65 72 20 | r11 DMA buffer |
00000860 69 6e 74 65 72 6c 65 61 66 20 69 6e 63 72 65 6d |interleaf increm|
00000870 65 6e 74 0d 02 bc 36 20 3a 20 20 20 20 20 20 20 |ent...6 : |
00000880 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | |
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