Home » Archimedes archive » Archimedes World » AW-1996-03-Disc 2.adf » !AcornAns_AcornAns » September/Bounce/Bouncer
September/Bounce/Bouncer
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-1996-03-Disc 2.adf » !AcornAns_AcornAns |
| Filename: | September/Bounce/Bouncer |
| Read OK: | ✔ |
| File size: | 1FDE bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
10REM >Bouncer
20REM Purpose: Demo of fast sprite plotting for specific sprites,
30REM via simple animation of bouncing heads in a mode 12 screen.
40REM
50REM Compare performance with that of 'SprOp' which achieves same
60REM animation purely in BASIC using the general purpose
70REM OS_SpriteOp, & is hence many times slower (roughly 5x).
80REM
90REM To check this out for yourself, see how many heads each
100REM program can simultaneously bounce, whilst still maintaining
110REM a reasonable frame rate of no less than eg 25fps (or 50fps
120REM for maximum smoothness & speed).
130REM
140:
150REM NB program will produce a beep if animation speed falls
160REM below the target fps rate.
170targetfps% = 50
180IF 100MODtargetfps%<>0 ERROR 1, "Require targetfps divides into 100"
190:
200SYS &20280, 0, -1 TO ;flags%
210IF flags% AND 1 THEN arm3%=FALSE ELSE arm3%=TRUE
220:
230REM n% is the number of heads to be bounced
240n%=38
250IF arm3%=FALSE n%=n%/2.7
260recommend$=STR$n%
270:
280ON ERROR SYS 6,112,1:SYS 6,113,1:PRINT REPORT$;" at line ";ERL:END
290D% = RND(-TIME)
300MODE 12+128:MODE 12:OFF
310*Run Palette
320COLOUR 128+1:CLS
330DIM data% 17920
340SYS "OS_File", 255, "HeadData", data%, 0
350:
360maxn%=400
370DIM b% maxn%*16
380REM NB b% stores array (of size n%) of structure:
390REM {x coord, y coord, x increment, y increment}
400:
410PROCass
420:
430REPEAT
440 SYS 6,112,1:SYS 6,113,1
450 REPEAT
460 CLS
470 PRINT '"Please enter number of heads to bounce ("+recommend$+" recommended, "+STR$maxn%+" max) ";
480 INPUT n%
490 UNTIL n%<=maxn% AND n%>0
500 !an%=n%
510 :
520 REM initialise head locations & velocities
530 FOR i% = 0 TO n%*16-1 STEP 16
540 b%!(i%+0) = RND(1000) + 140
550 b%!(i%+4) = RND(700) + 0
560 b%!(i%+8) = RND(16)*(0.5+(RND(1)<0.5))
570 b%!(i%+12) = RND(08)*(0.5+(RND(1)<0.5))
580 NEXT
590 :
600 CALL bounce%
610 :
620UNTIL FALSE
630:
640END
650:
660DEF PROCass
670DIM code% 10240
680!code%=148:code%!4=-1
690SYS "OS_ReadVduVariables", code%, code%
700scrst%=!code%
710FOR pass% = 0 TO 2 STEP 2
720 P%=code%
730 [OPT pass%
740 .aspframe% EQUD 0
750 .ascrstsum% EQUD scrst%*2+81920
760 .an% EQUD 0
770 .ab% EQUD b%
780 .atime% EQUD 0 ;time storage for frame speed calc
790 .afc% EQUD 0 ;frame counter
800 .bounce%
810 STMFD 13!, {14}
820 STR 13, aspframe% ;store sp to free up r13
830 .nextframe%
840 :
850 SWI "OS_ReadMonotonicTime" ;track frame speed
860 STR 0, atime%
870 :
880 MOV 0, #19
890 SWI "OS_Byte" ;wait for vsync
900 MOV 0, #113
910 LDR 1, abank%
920 RSB 3, 1, #3
930 STR 3, abank%
940 SWI "OS_Byte" ;swap displayed screen bank
950 LDR 0, ascrstsum%
960 LDR 1, ascrst%
970 SUB 1, 0, 1
980 STR 1, ascrst% ;swap ptr to other bank
990 BL cls% ;cls that bank to grey (colour 1)
1000 LDR 12, ab%
1010 LDR 13, an%
1020 .frameplotloop% ;now plot each head:
1030 LDMIA 12, {0,1} ; read x,y coords from data
1040 MOV 0, 0, ASR #1
1050 MOV 1, 1, ASR #2
1060 BL plot% ; plot head at x,y
1070 ADD 12, 12, #16
1080 SUBS 13, 13, #1
1090 BNE frameplotloop% ;then do next head
1100 LDR 11, afc%
1110 ADD 11, 11, #1
1120 STR 11, afc% ;update frame count
1130 LDR 12, ab%
1140 LDR 13, an%
1150 .framemoveloop% ;then move each head
1160 LDMIA 12, {0,1,2,3} ; read x,y,xi,yi
1170 ADDS 0, 0, 2 ; alter x
1180 RSBMI 2, 2, #0 ; if off left side, reverse velocity
1190 ADDMI 0, 0, 2 ; & move back
1200 ADDS 1, 1, 3 ; alter y
1210 RSBMI 3, 3, #0 ; if off top side, reverse velocity
1220 ADDMI 1, 1, 3 ; & move back
1230 SUBS 14, 0, #1024 ; (these 2 instructs are equiv
1240 SUBGTS 14, 14, #142 ; to CMP 0, #1166)
1250 RSBGT 2, 2, #0 ; if off right, reverse velocity
1260 ADDGT 0, 0, 2 ; & move back
1270 CMP 1, #884
1280 RSBGT 3, 3, #0 ; if off bottom, reverse velocity
1290 ADDGT 1, 1, 3 ; & move back
1300 TST 11, #3 ; if frame count is a multiple of 4
1310 ADDEQ 3, 3, #1 ; accelerate head downwards
1320 STMIA 12!, {0,1,2,3} ; restore x,y,xi,yi
1330 SUBS 13, 13, #1
1340 BNE framemoveloop% ;then do next head
1350 :
1360 SWI "OS_ReadMonotonicTime" ;calculate frame speed
1370 LDR 1, atime%
1380 SUB 0, 0, 1
1390 CMP 0, #100/targetfps%
1400 SWIGT 256+7 ;beep if it falls below target fps
1410 :
1420 MOV 0, #129
1430 MOV 1, #0
1440 MOV 2, #0
1450 SWI "OS_Byte"
1460 CMP 2, #&FF
1470 BEQ nextframe% ;if no key pressed, do next frame
1480 LDR 13, aspframe% ;restore sp
1490 LDMFD 13!, {PC} ;return to BASIC
1500 :
1510 .ascrst% EQUD scrst%
1520 .adata% EQUD data%
1530 .abank% EQUD 1
1540 .aplotregs% EQUD 0:EQUD 0:EQUD 0
1550 .plot% ;plot our head sprite at coords r0,r1
1560 ;where 0,0 is top left & 639,255 is bottom right
1570 ;NB sprite MUST lie entirely within screen
1580 ADR 11, aplotregs%
1590 STMIA 11, {12,13,14}
1600 AND 2, 0, #7 ;calculate which of the 8 sprite
1610 RSB 3, 2, 2, ASL #2 ;alignments we need via:
1620 ADD 3, 3, 2, ASL #5 ;(xAND7)*35*64 + data%
1630 BIC 0, 0, #7 ;round x down to mult of 8
1640 ADD 1, 1, 1, ASL #2
1650 LDR 2, ascrst%
1660 ADD 2, 2, 1, ASL #6
1670 ADD 0, 2, 0, ASR #1 ;calc (screen ptr + 320y + x)
1680 LDR 1, adata%
1690 ADD 1, 1, 3, ASL #6 ;finally calc (xAND7)*35*64+data%
1700 MOV 2, #7
1710 .loop1% ;now plot sprite
1720 FNfrag1(pass%) ;plot 1st half of 1st row
1730 FNfrag1(pass%) ; 2nd half of 1st row
1740 ADD 0, 0, #320-32 ;move screen ptr to start next row
1750 FNfrag1(pass%) ;plot 1st half of 2nd row
1760 FNfrag1(pass%) ; etc . . .
1770 ADD 0, 0, #320-32
1780 FNfrag1(pass%)
1790 FNfrag1(pass%)
1800 ADD 0, 0, #320-32
1810 FNfrag1(pass%)
1820 FNfrag1(pass%)
1830 ADD 0, 0, #320-32
1840 FNfrag1(pass%)
1850 FNfrag1(pass%) ;plot 2nd half of 5th row
1860 ADD 0, 0, #320-32
1870 SUBS 2, 2, #1
1880 BNE loop1% ;repeat above 7 times to do all 35 rows
1890 ADR 11, aplotregs% ;plot completed - return to caller
1900 LDMIA 11, {12,13,PC} ;preserving r12 & r13.
1910 :
1920 .alrcls% EQUD 0
1930 .aspcls% EQUD 0
1940 .cls% ;simple routine to clear screen
1950 STR 14, alrcls% ;as rapidly as possible -
1960 STR 13, aspcls% ;note the heavy use of STM.
1970 LDR 0, ascrst%
1980 MOV 1, #105
1990 MOV 2, #&11
2000 ORR 2, 2, 2, LSL #8
2010 ORR 2, 2, 2, LSL #16
2020 MOV 3, 2
2030 MOV 4, 2
2040 MOV 5, 2
2050 MOV 6, 2
2060 MOV 7, 2
2070 MOV 8, 2
2080 MOV 9, 2
2090 MOV 10, 2
2100 MOV 11, 2
2110 MOV 12, 2
2120 MOV 13, 2
2130 MOV 14, 2
2140 .clsloop%
2150 STMIA 0!, {2-14}
2160 STMIA 0!, {2-14}
2170 STMIA 0!, {2-14}
2180 STMIA 0!, {2-14}
2190 STMIA 0!, {2-14}
2200 STMIA 0!, {2-14}
2210 STMIA 0!, {2-14}
2220 STMIA 0!, {2-14}
2230 STMIA 0!, {2-14}
2240 STMIA 0!, {2-14}
2250 STMIA 0!, {2-14}
2260 STMIA 0!, {2-14}
2270 STMIA 0!, {2-14}
2280 STMIA 0!, {2-14}
2290 STMIA 0!, {2-14}
2300 SUBS 1, 1, #1
2310 BNE clsloop%
2320 STMIA 0!, {2-6}
2330 LDR 13, aspcls%
2340 LDR PC, alrcls%
2350 ]
2360NEXT
2370ENDPROC
2380:
2390DEF FNfrag1(pass%) :REM macro to plot 1/2 a row (32 pixels)
2400[OPT pass% :REM of our sprite
2410LDMIA 0, {3-6} ;read 4 words of screen (32 pixels)
2420LDMIA 1!, {7-14} ;read 32 sprite pixels & 32 masks
2430AND 3, 3, 8 ;apply mask to screen, zeroing
2440AND 4, 4, 10 ; those bits where will write
2450AND 5, 5, 12 ; sprite image in a moment
2460AND 6, 6, 14
2470ORR 3, 3, 7 ;write in the sprite image
2480ORR 4, 4, 9
2490ORR 5, 5, 11
2500ORR 6, 6, 13
2510STMIA 0!, {3-6} ;restore the data back to screen
2520]
2530=pass%
� >Bouncer
A� Purpose: Demo of fast sprite plotting for specific sprites,
A� via simple animation of bouncing heads in a mode 12 screen.
(�
2B� Compare performance with that of 'SprOp' which achieves same
<9� animation purely in BASIC using the general purpose
F=� OS_SpriteOp, & is hence many times slower (roughly 5x).
P�
Z=� To check this out for yourself, see how many heads each
dA� program can simultaneously bounce, whilst still maintaining
n@� a reasonable frame rate of no less than eg 25fps (or 50fps
x&� for maximum smoothness & speed).
��
�:
�=� NB program will produce a beep if animation speed falls
� � below the target fps rate.
�targetfps% = 50
�A� 100�targetfps%<>0 � 1, "Require targetfps divides into 100"
�:
� ș &20280, 0, -1 � ;flags%
�$� flags% � 1 � arm3%=� � arm3%=�
�:
�-� n% is the number of heads to be bounced
� n%=38
�� arm3%=� n%=n%/2.7
recommend$=�n%
:
2� � ș 6,112,1:ș 6,113,1:� �$;" at line ";�:�
"D% = �(-�)
,� 12+128:� 12:�
6*Run Palette
@
� 128+1:�
J� data% 17920
T+ș "OS_File", 255, "HeadData", data%, 0
^:
h
maxn%=400
r� b% maxn%*16
|3� NB b% stores array (of size n%) of structure:
�2� {x coord, y coord, x increment, y increment}
�:
��ass
�:
��
� ș 6,112,1:ș 6,113,1
� �
� �
�` � '"Please enter number of heads to bounce ("+recommend$+" recommended, "+�maxn%+" max) ";
�
� n%
� � n%<=maxn% � n%>0
� !an%=n%
� :
- � initialise head locations & velocities
� i% = 0 � n%*16-1 � 16
! b%!(i%+0) = �(1000) + 140
& b%!(i%+4) = �(700) + 0
0* b%!(i%+8) = �(16)*(0.5+(�(1)<0.5))
:* b%!(i%+12) = �(08)*(0.5+(�(1)<0.5))
D �
N :
X � bounce%
b :
l� �
v:
��
�:
�
� �ass
�� code% 10240
�!code%=148:code%!4=-1
�*ș "OS_ReadVduVariables", code%, code%
�scrst%=!code%
�� pass% = 0 � 2 � 2
�
P%=code%
� [OPT pass%
� .aspframe% EQUD 0
�+ .ascrstsum% EQUD scrst%*2+81920
� .an% EQUD 0
.ab% EQUD b%
D .atime% EQUD 0 ;time storage for frame speed calc
0 .afc% EQUD 0 ;frame counter
.bounce%
* STMFD 13!, {14}
4: STR 13, aspframe% ;store sp to free up r13
> .nextframe%
H :
R> SWI "OS_ReadMonotonicTime" ;track frame speed
\ STR 0, atime%
f :
p MOV 0, #19
z; SWI "OS_Byte" ;wait for vsync
� MOV 0, #113
� LDR 1, abank%
� RSB 3, 1, #3
� STR 3, abank%
�= SWI "OS_Byte" ;swap displayed screen bank
� LDR 0, ascrstsum%
� LDR 1, ascrst%
� SUB 1, 0, 1
�9 STR 1, ascrst% ;swap ptr to other bank
�C BL cls% ;cls that bank to grey (colour 1)
� LDR 12, ab%
� LDR 13, an%
�6 .frameplotloop% ;now plot each head:
= LDMIA 12, {0,1} ; read x,y coords from data
MOV 0, 0, ASR #1
MOV 1, 1, ASR #2
$4 BL plot% ; plot head at x,y
. ADD 12, 12, #16
8 SUBS 13, 13, #1
B4 BNE frameplotloop% ;then do next head
L LDR 11, afc%
V ADD 11, 11, #1
`5 STR 11, afc% ;update frame count
j LDR 12, ab%
t LDR 13, an%
~6 .framemoveloop% ;then move each head
�2 LDMIA 12, {0,1,2,3} ; read x,y,xi,yi
�+ ADDS 0, 0, 2 ; alter x
�F RSBMI 2, 2, #0 ; if off left side, reverse velocity
�/ ADDMI 0, 0, 2 ; & move back
�+ ADDS 1, 1, 3 ; alter y
�E RSBMI 3, 3, #0 ; if off top side, reverse velocity
�/ ADDMI 1, 1, 3 ; & move back
�@ SUBS 14, 0, #1024 ; (these 2 instructs are equiv
�5 SUBGTS 14, 14, #142 ; to CMP 0, #1166)
�B RSBGT 2, 2, #0 ; if off right, reverse velocity
�/ ADDGT 0, 0, 2 ; & move back
� CMP 1, #884
C RSBGT 3, 3, #0 ; if off bottom, reverse velocity
/ ADDGT 1, 1, 3 ; & move back
E TST 11, #3 ; if frame count is a multiple of 4
= ADDEQ 3, 3, #1 ; accelerate head downwards
(5 STMIA 12!, {0,1,2,3} ; restore x,y,xi,yi
2 SUBS 13, 13, #1
<4 BNE framemoveloop% ;then do next head
F :
PB SWI "OS_ReadMonotonicTime" ;calculate frame speed
Z LDR 1, atime%
d SUB 0, 0, 1
n CMP 0, #100/targetfps%
xD SWIGT 256+7 ;beep if it falls below target fps
� :
� MOV 0, #129
� MOV 1, #0
� MOV 2, #0
� SWI "OS_Byte"
� CMP 2, #&FF
�C BEQ nextframe% ;if no key pressed, do next frame
�- LDR 13, aspframe% ;restore sp
�2 LDMFD 13!, {PC} ;return to BASIC
� :
� .ascrst% EQUD scrst%
� .adata% EQUD data%
� .abank% EQUD 1
, .aplotregs% EQUD 0:EQUD 0:EQUD 0
3 .plot% ;plot our head sprite at coords r0,r1
> ;where 0,0 is top left & 639,255 is bottom right
"8 ;NB sprite MUST lie entirely within screen
, ADR 11, aplotregs%
6 STMIA 11, {12,13,14}
@@ � 2, 0, #7 ;calculate which of the 8 sprite
J: RSB 3, 2, 2, ASL #2 ;alignments we need via:
T8 ADD 3, 3, 2, ASL #5 ;(xAND7)*35*64 + data%
^< BIC 0, 0, #7 ;round x down to mult of 8
h ADD 1, 1, 1, ASL #2
r LDR 2, ascrst%
| ADD 2, 2, 1, ASL #6
�? ADD 0, 2, 0, ASR #1 ;calc (screen ptr + 320y + x)
� LDR 1, adata%
�C ADD 1, 1, 3, ASL #6 ;finally calc (xAND7)*35*64+data%
� MOV 2, #7
�2 .loop1% ;now plot sprite
�: �frag1(pass%) ;plot 1st half of 1st row
�: �frag1(pass%) ; 2nd half of 1st row
�D ADD 0, 0, #320-32 ;move screen ptr to start next row
�: �frag1(pass%) ;plot 1st half of 2nd row
�, �frag1(pass%) ; etc . . .
� ADD 0, 0, #320-32
� �frag1(pass%)
� �frag1(pass%)
ADD 0, 0, #320-32
�frag1(pass%)
�frag1(pass%)
& ADD 0, 0, #320-32
0 �frag1(pass%)
:: �frag1(pass%) ;plot 2nd half of 5th row
D ADD 0, 0, #320-32
N SUBS 2, 2, #1
XE BNE loop1% ;repeat above 7 times to do all 35 rows
bD ADR 11, aplotregs% ;plot completed - return to caller
l8 LDMIA 11, {12,13,PC} ;preserving r12 & r13.
v :
� .alrcls% EQUD 0
� .aspcls% EQUD 0
�A .cls% ;simple routine to clear screen
�; STR 14, alrcls% ;as rapidly as possible -
�= STR 13, aspcls% ;note the heavy use of STM.
� LDR 0, ascrst%
� MOV 1, #105
� MOV 2, #&11
� �R 2, 2, 2, LSL #8
� �R 2, 2, 2, LSL #16
� MOV 3, 2
� MOV 4, 2
� MOV 5, 2
MOV 6, 2
MOV 7, 2
MOV 8, 2
MOV 9, 2
* MOV 10, 2
4 MOV 11, 2
> MOV 12, 2
H MOV 13, 2
R MOV 14, 2
\ .clsloop%
f STMIA 0!, {2-14}
p STMIA 0!, {2-14}
z STMIA 0!, {2-14}
� STMIA 0!, {2-14}
� STMIA 0!, {2-14}
� STMIA 0!, {2-14}
� STMIA 0!, {2-14}
� STMIA 0!, {2-14}
� STMIA 0!, {2-14}
� STMIA 0!, {2-14}
� STMIA 0!, {2-14}
� STMIA 0!, {2-14}
� STMIA 0!, {2-14}
� STMIA 0!, {2-14}
� STMIA 0!, {2-14}
� SUBS 1, 1, #1
BNE clsloop%
STMIA 0!, {2-6}
LDR 13, aspcls%
$ LDR PC, alrcls%
. ]
8�
B�
L:
V@� �frag1(pass%) :� macro to plot 1/2 a row (32 pixels)
`-[OPT pass% :� of our sprite
jELDMIA 0, {3-6} ;read 4 words of screen (32 pixels)
tCLDMIA 1!, {7-14} ;read 32 sprite pixels & 32 masks
~>� 3, 3, 8 ;apply mask to screen, zeroing
�=� 4, 4, 10 ; those bits where will write
�:� 5, 5, 12 ; sprite image in a moment
�� 6, 6, 14
�;�R 3, 3, 7 ;write in the sprite image
��R 4, 4, 9
��R 5, 5, 11
��R 6, 6, 13
�BSTMIA 0!, {3-6} ;restore the data back to screen
�]
�
=pass%
� 00000000 0d 00 0a 0e f4 20 3e 42 6f 75 6e 63 65 72 0d 00 |..... >Bouncer..|
00000010 14 41 f4 20 50 75 72 70 6f 73 65 3a 20 44 65 6d |.A. Purpose: Dem|
00000020 6f 20 6f 66 20 66 61 73 74 20 73 70 72 69 74 65 |o of fast sprite|
00000030 20 70 6c 6f 74 74 69 6e 67 20 66 6f 72 20 73 70 | plotting for sp|
00000040 65 63 69 66 69 63 20 73 70 72 69 74 65 73 2c 0d |ecific sprites,.|
00000050 00 1e 41 f4 20 76 69 61 20 73 69 6d 70 6c 65 20 |..A. via simple |
00000060 61 6e 69 6d 61 74 69 6f 6e 20 6f 66 20 62 6f 75 |animation of bou|
00000070 6e 63 69 6e 67 20 68 65 61 64 73 20 69 6e 20 61 |ncing heads in a|
00000080 20 6d 6f 64 65 20 31 32 20 73 63 72 65 65 6e 2e | mode 12 screen.|
00000090 0d 00 28 05 f4 0d 00 32 42 f4 20 43 6f 6d 70 61 |..(....2B. Compa|
000000a0 72 65 20 70 65 72 66 6f 72 6d 61 6e 63 65 20 77 |re performance w|
000000b0 69 74 68 20 74 68 61 74 20 6f 66 20 27 53 70 72 |ith that of 'Spr|
000000c0 4f 70 27 20 77 68 69 63 68 20 61 63 68 69 65 76 |Op' which achiev|
000000d0 65 73 20 73 61 6d 65 0d 00 3c 39 f4 20 61 6e 69 |es same..<9. ani|
000000e0 6d 61 74 69 6f 6e 20 70 75 72 65 6c 79 20 69 6e |mation purely in|
000000f0 20 42 41 53 49 43 20 75 73 69 6e 67 20 74 68 65 | BASIC using the|
00000100 20 67 65 6e 65 72 61 6c 20 70 75 72 70 6f 73 65 | general purpose|
00000110 0d 00 46 3d f4 20 4f 53 5f 53 70 72 69 74 65 4f |..F=. OS_SpriteO|
00000120 70 2c 20 26 20 69 73 20 68 65 6e 63 65 20 6d 61 |p, & is hence ma|
00000130 6e 79 20 74 69 6d 65 73 20 73 6c 6f 77 65 72 20 |ny times slower |
00000140 28 72 6f 75 67 68 6c 79 20 35 78 29 2e 0d 00 50 |(roughly 5x)...P|
00000150 05 f4 0d 00 5a 3d f4 20 54 6f 20 63 68 65 63 6b |....Z=. To check|
00000160 20 74 68 69 73 20 6f 75 74 20 66 6f 72 20 79 6f | this out for yo|
00000170 75 72 73 65 6c 66 2c 20 73 65 65 20 68 6f 77 20 |urself, see how |
00000180 6d 61 6e 79 20 68 65 61 64 73 20 65 61 63 68 0d |many heads each.|
00000190 00 64 41 f4 20 70 72 6f 67 72 61 6d 20 63 61 6e |.dA. program can|
000001a0 20 73 69 6d 75 6c 74 61 6e 65 6f 75 73 6c 79 20 | simultaneously |
000001b0 62 6f 75 6e 63 65 2c 20 77 68 69 6c 73 74 20 73 |bounce, whilst s|
000001c0 74 69 6c 6c 20 6d 61 69 6e 74 61 69 6e 69 6e 67 |till maintaining|
000001d0 0d 00 6e 40 f4 20 61 20 72 65 61 73 6f 6e 61 62 |..n@. a reasonab|
000001e0 6c 65 20 66 72 61 6d 65 20 72 61 74 65 20 6f 66 |le frame rate of|
000001f0 20 6e 6f 20 6c 65 73 73 20 74 68 61 6e 20 65 67 | no less than eg|
00000200 20 32 35 66 70 73 20 28 6f 72 20 35 30 66 70 73 | 25fps (or 50fps|
00000210 0d 00 78 26 f4 20 66 6f 72 20 6d 61 78 69 6d 75 |..x&. for maximu|
00000220 6d 20 73 6d 6f 6f 74 68 6e 65 73 73 20 26 20 73 |m smoothness & s|
00000230 70 65 65 64 29 2e 0d 00 82 05 f4 0d 00 8c 05 3a |peed)..........:|
00000240 0d 00 96 3d f4 20 4e 42 20 70 72 6f 67 72 61 6d |...=. NB program|
00000250 20 77 69 6c 6c 20 70 72 6f 64 75 63 65 20 61 20 | will produce a |
00000260 62 65 65 70 20 69 66 20 61 6e 69 6d 61 74 69 6f |beep if animatio|
00000270 6e 20 73 70 65 65 64 20 66 61 6c 6c 73 0d 00 a0 |n speed falls...|
00000280 20 f4 20 62 65 6c 6f 77 20 74 68 65 20 74 61 72 | . below the tar|
00000290 67 65 74 20 66 70 73 20 72 61 74 65 2e 0d 00 aa |get fps rate....|
000002a0 13 74 61 72 67 65 74 66 70 73 25 20 3d 20 35 30 |.targetfps% = 50|
000002b0 0d 00 b4 41 e7 20 31 30 30 83 74 61 72 67 65 74 |...A. 100.target|
000002c0 66 70 73 25 3c 3e 30 20 85 20 31 2c 20 22 52 65 |fps%<>0 . 1, "Re|
000002d0 71 75 69 72 65 20 74 61 72 67 65 74 66 70 73 20 |quire targetfps |
000002e0 64 69 76 69 64 65 73 20 69 6e 74 6f 20 31 30 30 |divides into 100|
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00000c40 44 20 20 20 20 20 20 31 31 2c 20 31 31 2c 20 23 |D 11, 11, #|
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00000de0 72 20 79 0d 04 ba 45 20 52 53 42 4d 49 20 20 20 |r y...E RSBMI |
00000df0 20 33 2c 20 33 2c 20 23 30 20 20 20 20 20 20 20 | 3, 3, #0 |
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00000e50 76 65 20 62 61 63 6b 0d 04 ce 40 20 53 55 42 53 |ve back...@ SUBS|
00000e60 20 20 20 20 20 31 34 2c 20 30 2c 20 23 31 30 32 | 14, 0, #102|
00000e70 34 20 20 20 20 20 20 20 20 3b 20 28 74 68 65 73 |4 ; (thes|
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00001010 44 45 51 20 20 20 20 33 2c 20 33 2c 20 23 31 20 |DEQ 3, 3, #1 |
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00001050 20 20 20 20 31 32 21 2c 20 7b 30 2c 31 2c 32 2c | 12!, {0,1,2,|
00001060 33 7d 20 20 20 20 20 20 3b 20 72 65 73 74 6f 72 |3} ; restor|
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00001090 20 23 31 0d 05 3c 34 20 42 4e 45 20 20 20 20 20 | #1..<4 BNE |
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00001100 61 74 65 20 66 72 61 6d 65 20 73 70 65 65 64 0d |ate frame speed.|
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00001160 53 57 49 47 54 20 20 20 20 32 35 36 2b 37 20 20 |SWIGT 256+7 |
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00001210 20 42 45 51 20 20 20 20 20 20 6e 65 78 74 66 72 | BEQ nextfr|
00001220 61 6d 65 25 20 20 20 20 20 20 20 20 20 20 3b 69 |ame% ;i|
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00001260 20 61 73 70 66 72 61 6d 65 25 20 20 20 20 20 20 | aspframe% |
00001270 20 3b 72 65 73 74 6f 72 65 20 73 70 0d 05 d2 32 | ;restore sp...2|
00001280 20 4c 44 4d 46 44 20 20 20 20 31 33 21 2c 20 7b | LDMFD 13!, {|
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00001be0 98 18 20 53 54 4d 49 41 20 20 20 20 30 21 2c 20 |.. STMIA 0!, |
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00001c10 ac 18 20 53 54 4d 49 41 20 20 20 20 30 21 2c 20 |.. STMIA 0!, |
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00001fde 
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