Home » Recent acquisitions » Acorn ADFS disks » adfs_AcornUser_199611.adf » Extras » Harrison/!FBackQTM/Docs/FlashForm
Harrison/!FBackQTM/Docs/FlashForm
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 » Recent acquisitions » Acorn ADFS disks » adfs_AcornUser_199611.adf » Extras |
| Filename: | Harrison/!FBackQTM/Docs/FlashForm |
| Read OK: | ✔ |
| File size: | 05FE bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
Flashback music fileformat /decoded and decyphered by Phoenix/
--------------------------
For all those who are interested, this is the file format of the Flashback
music files, stored uncompressed in the Flashback application as
"!Flashback.m.<file>", where <file> is a letter from "a" to "u".
Offset Meaning
------ ----------------------------------------------------------------------
+&0000 Song sequence, made up of 1 byte pattern numbers
..
..
-> until &FF terminator
+&0020 Sample blocks
A sample block consists of 6 words per sample:
+&00 offset from start of file to sample data
+&04 length of sample in bytes
+&08 finetune value (-8 to +7)
+&0C linear volume (0 to 64)
+&10 repeat offset from sample start
+&14 repeat length (no repeat if <=2)
..
..
-> until sample offset at +&00 < last sample offset
+&01A0 Pattern data blocks, number of patterns=<max. entry in sequence>+1
Each pattern 1024 bytes (1 word per channel, 4 channels, 64 entries)
A channel word is split into 4*1 byte values:
+&00 sample number, first sample is number 1 \
+&01 note number \_ Any entry can be 0
+&02 effect number in first 4 bits / for do nothing
+&03 effect information byte /
Note number range 1 to 36: 1="C-1", 2="C#1"... 35="A#3", 36="B-3"
+&nnnn 8-bit linear signed sample data, stored after pattern data
00000000 46 6c 61 73 68 62 61 63 6b 20 6d 75 73 69 63 20 |Flashback music | 00000010 66 69 6c 65 66 6f 72 6d 61 74 20 20 20 20 20 20 |fileformat | 00000020 20 20 20 20 20 20 20 20 20 20 2f 64 65 63 6f 64 | /decod| 00000030 65 64 20 61 6e 64 20 64 65 63 79 70 68 65 72 65 |ed and decyphere| 00000040 64 20 62 79 20 50 68 6f 65 6e 69 78 2f 0a 2d 2d |d by Phoenix/.--| 00000050 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------| 00000060 2d 2d 2d 2d 2d 2d 2d 2d 0a 0a 46 6f 72 20 61 6c |--------..For al| 00000070 6c 20 74 68 6f 73 65 20 77 68 6f 20 61 72 65 20 |l those who are | 00000080 69 6e 74 65 72 65 73 74 65 64 2c 20 74 68 69 73 |interested, this| 00000090 20 69 73 20 74 68 65 20 66 69 6c 65 20 66 6f 72 | is the file for| 000000a0 6d 61 74 20 6f 66 20 74 68 65 20 46 6c 61 73 68 |mat of the Flash| 000000b0 62 61 63 6b 0a 6d 75 73 69 63 20 66 69 6c 65 73 |back.music files| 000000c0 2c 20 73 74 6f 72 65 64 20 75 6e 63 6f 6d 70 72 |, stored uncompr| 000000d0 65 73 73 65 64 20 69 6e 20 74 68 65 20 46 6c 61 |essed in the Fla| 000000e0 73 68 62 61 63 6b 20 61 70 70 6c 69 63 61 74 69 |shback applicati| 000000f0 6f 6e 20 61 73 0a 22 21 46 6c 61 73 68 62 61 63 |on as."!Flashbac| 00000100 6b 2e 6d 2e 3c 66 69 6c 65 3e 22 2c 20 77 68 65 |k.m.<file>", whe| 00000110 72 65 20 3c 66 69 6c 65 3e 20 69 73 20 61 20 6c |re <file> is a l| 00000120 65 74 74 65 72 20 66 72 6f 6d 20 22 61 22 20 74 |etter from "a" t| 00000130 6f 20 22 75 22 2e 0a 0a 0a 4f 66 66 73 65 74 20 |o "u"....Offset | 00000140 4d 65 61 6e 69 6e 67 0a 2d 2d 2d 2d 2d 2d 20 2d |Meaning.------ -| 00000150 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d |----------------| * 00000190 2d 2d 2d 2d 2d 0a 0a 2b 26 30 30 30 30 20 53 6f |-----..+&0000 So| 000001a0 6e 67 20 73 65 71 75 65 6e 63 65 2c 20 6d 61 64 |ng sequence, mad| 000001b0 65 20 75 70 20 6f 66 20 31 20 62 79 74 65 20 70 |e up of 1 byte p| 000001c0 61 74 74 65 72 6e 20 6e 75 6d 62 65 72 73 0a 20 |attern numbers. | 000001d0 20 20 2e 2e 0a 20 20 20 2e 2e 0a 20 20 20 20 2d | ... ... -| 000001e0 3e 20 75 6e 74 69 6c 20 26 46 46 20 74 65 72 6d |> until &FF term| 000001f0 69 6e 61 74 6f 72 0a 0a 0a 2b 26 30 30 32 30 20 |inator...+&0020 | 00000200 53 61 6d 70 6c 65 20 62 6c 6f 63 6b 73 0a 0a 20 |Sample blocks.. | 00000210 20 20 20 20 20 20 41 20 73 61 6d 70 6c 65 20 62 | A sample b| 00000220 6c 6f 63 6b 20 63 6f 6e 73 69 73 74 73 20 6f 66 |lock consists of| 00000230 20 36 20 77 6f 72 64 73 20 70 65 72 20 73 61 6d | 6 words per sam| 00000240 70 6c 65 3a 0a 20 20 20 20 20 20 20 0a 20 20 20 |ple:. . | 00000250 20 20 20 20 2b 26 30 30 20 6f 66 66 73 65 74 20 | +&00 offset | 00000260 66 72 6f 6d 20 73 74 61 72 74 20 6f 66 20 66 69 |from start of fi| 00000270 6c 65 20 74 6f 20 73 61 6d 70 6c 65 20 64 61 74 |le to sample dat| 00000280 61 0a 20 20 20 20 20 20 20 2b 26 30 34 20 6c 65 |a. +&04 le| 00000290 6e 67 74 68 20 6f 66 20 73 61 6d 70 6c 65 20 69 |ngth of sample i| 000002a0 6e 20 62 79 74 65 73 0a 20 20 20 20 20 20 20 2b |n bytes. +| 000002b0 26 30 38 20 66 69 6e 65 74 75 6e 65 20 76 61 6c |&08 finetune val| 000002c0 75 65 20 28 2d 38 20 74 6f 20 2b 37 29 0a 20 20 |ue (-8 to +7). | 000002d0 20 20 20 20 20 2b 26 30 43 20 6c 69 6e 65 61 72 | +&0C linear| 000002e0 20 76 6f 6c 75 6d 65 20 28 30 20 74 6f 20 36 34 | volume (0 to 64| 000002f0 29 0a 20 20 20 20 20 20 20 2b 26 31 30 20 72 65 |). +&10 re| 00000300 70 65 61 74 20 6f 66 66 73 65 74 20 66 72 6f 6d |peat offset from| 00000310 20 73 61 6d 70 6c 65 20 73 74 61 72 74 0a 20 20 | sample start. | 00000320 20 20 20 20 20 2b 26 31 34 20 72 65 70 65 61 74 | +&14 repeat| 00000330 20 6c 65 6e 67 74 68 20 28 6e 6f 20 72 65 70 65 | length (no repe| 00000340 61 74 20 69 66 20 3c 3d 32 29 0a 0a 20 20 20 2e |at if <=2).. .| 00000350 2e 0a 20 20 20 2e 2e 0a 20 20 20 20 2d 3e 20 75 |.. ... -> u| 00000360 6e 74 69 6c 20 73 61 6d 70 6c 65 20 6f 66 66 73 |ntil sample offs| 00000370 65 74 20 61 74 20 2b 26 30 30 20 3c 20 6c 61 73 |et at +&00 < las| 00000380 74 20 73 61 6d 70 6c 65 20 6f 66 66 73 65 74 0a |t sample offset.| 00000390 0a 0a 2b 26 30 31 41 30 20 50 61 74 74 65 72 6e |..+&01A0 Pattern| 000003a0 20 64 61 74 61 20 62 6c 6f 63 6b 73 2c 20 6e 75 | data blocks, nu| 000003b0 6d 62 65 72 20 6f 66 20 70 61 74 74 65 72 6e 73 |mber of patterns| 000003c0 3d 3c 6d 61 78 2e 20 65 6e 74 72 79 20 69 6e 20 |=<max. entry in | 000003d0 73 65 71 75 65 6e 63 65 3e 2b 31 0a 0a 20 20 20 |sequence>+1.. | 000003e0 20 20 20 20 45 61 63 68 20 70 61 74 74 65 72 6e | Each pattern| 000003f0 20 31 30 32 34 20 62 79 74 65 73 20 28 31 20 77 | 1024 bytes (1 w| 00000400 6f 72 64 20 70 65 72 20 63 68 61 6e 6e 65 6c 2c |ord per channel,| 00000410 20 34 20 63 68 61 6e 6e 65 6c 73 2c 20 36 34 20 | 4 channels, 64 | 00000420 65 6e 74 72 69 65 73 29 0a 0a 20 20 20 20 20 20 |entries).. | 00000430 20 41 20 63 68 61 6e 6e 65 6c 20 77 6f 72 64 20 | A channel word | 00000440 69 73 20 73 70 6c 69 74 20 69 6e 74 6f 20 34 2a |is split into 4*| 00000450 31 20 62 79 74 65 20 76 61 6c 75 65 73 3a 0a 20 |1 byte values:. | 00000460 20 20 20 20 20 20 0a 20 20 20 20 20 20 20 2b 26 | . +&| 00000470 30 30 20 73 61 6d 70 6c 65 20 6e 75 6d 62 65 72 |00 sample number| 00000480 2c 20 66 69 72 73 74 20 73 61 6d 70 6c 65 20 69 |, first sample i| 00000490 73 20 6e 75 6d 62 65 72 20 31 20 20 5c 0a 20 20 |s number 1 \. | 000004a0 20 20 20 20 20 2b 26 30 31 20 6e 6f 74 65 20 6e | +&01 note n| 000004b0 75 6d 62 65 72 20 20 20 20 20 20 20 20 20 20 20 |umber | 000004c0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 | | 000004d0 20 20 20 20 5c 5f 20 41 6e 79 20 65 6e 74 72 79 | \_ Any entry| 000004e0 20 63 61 6e 20 62 65 20 30 0a 20 20 20 20 20 20 | can be 0. | 000004f0 20 2b 26 30 32 20 65 66 66 65 63 74 20 6e 75 6d | +&02 effect num| 00000500 62 65 72 20 69 6e 20 66 69 72 73 74 20 34 20 62 |ber in first 4 b| 00000510 69 74 73 20 20 20 20 20 20 20 20 20 20 20 20 20 |its | 00000520 2f 20 20 66 6f 72 20 64 6f 20 6e 6f 74 68 69 6e |/ for do nothin| 00000530 67 0a 20 20 20 20 20 20 20 2b 26 30 33 20 65 66 |g. +&03 ef| 00000540 66 65 63 74 20 69 6e 66 6f 72 6d 61 74 69 6f 6e |fect information| 00000550 20 62 79 74 65 20 20 20 20 20 20 20 20 20 20 20 | byte | 00000560 20 20 20 20 20 20 20 2f 0a 20 20 20 20 20 20 20 | /. | 00000570 0a 20 20 20 20 20 20 20 4e 6f 74 65 20 6e 75 6d |. Note num| 00000580 62 65 72 20 72 61 6e 67 65 20 31 20 74 6f 20 33 |ber range 1 to 3| 00000590 36 3a 20 31 3d 22 43 2d 31 22 2c 20 32 3d 22 43 |6: 1="C-1", 2="C| 000005a0 23 31 22 2e 2e 2e 20 33 35 3d 22 41 23 33 22 2c |#1"... 35="A#3",| 000005b0 20 33 36 3d 22 42 2d 33 22 0a 0a 0a 2b 26 6e 6e | 36="B-3"...+&nn| 000005c0 6e 6e 20 38 2d 62 69 74 20 6c 69 6e 65 61 72 20 |nn 8-bit linear | 000005d0 73 69 67 6e 65 64 20 73 61 6d 70 6c 65 20 64 61 |signed sample da| 000005e0 74 61 2c 20 73 74 6f 72 65 64 20 61 66 74 65 72 |ta, stored after| 000005f0 20 70 61 74 74 65 72 6e 20 64 61 74 61 0a | pattern data.| 000005fe
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