WARNING: -------- This hex dump is shown only to help the reader understand how IFF chunks appear in a file. You cannot ever depend on any particular ILBM chunk being at any particular offset into the file. IFF files are composed, in their simplest form, of chunks within a FORM. Each chunk starts with a 4-letter chunkID, followed by a 32-bit length of the rest of the chunk. You must parse IFF files, skipping past unneeded or unknown chunks by seeking their length (+1 if odd length) to the next 4-letter chunk ID. In a real ILBM file, you are likely to encounter additional optional chunks. See the IFF Specification listed in the Amiga ROM Kernel Reference Manual: Devices for additional information on such chunks. 0000: 464F524D 00016418 494C424D 424D4844 FORM..d.ILBMBMHD 0010: 00000014 01400190 00000000 06000100 .....@.......... 0020: 00000A0B 01400190 43414D47 00000004 .....@..CAMG.... 0030: 00000804 434D4150 00000030 001000E0 ....CMAP...0.... 0040: E0E00000 20000050 30303050 50500030 .... ..P000PPP.0 0050: 90805040 70707010 60E02060 E06080D0 ..P@ppp.`. `.`.. 0060: A0A0A0A0 90E0C0C0 C0D0A0E0 424F4459 ............BODY 0070: 000163AC F8000F80 148A5544 2ABDEFFF ..c.......UD*... etc. Interpretation: 'F O R M' length 'I L B M"B M H D' <- start of BitMapHeader chunk 0000: 464F524D 00016418 494C424D 424D4844 FORM..d.ILBMBMHD Planes Mask length WideHigh XorgYorg PlMkCoRe <- Compression Reserved 0010: 00000014 01400190 00000000 06000100 .....@.......... start of C-AMiGa TranAspt PagwPagh 'C A M G' length <- View modes chunk 0020: 00000A0B 01400190 43414D47 00000004 .....@..CAMG.... dir include: ViewMode 'C M A P' length R g b R <- ViewMode 800=HAM | 4=LACE 0030: 00000804 434D4150 00000030 001000E0 ....CMAP...0.... g b R g b R g b R g b R g b R g <- Rgb's are for reg0 thru regN 0040: E0E00000 20000050 30303050 50500030 .... ..P000PPP.0 b R g b R g b R g b R g b R g b 0050: 90805040 70707010 60E02060 E06080D0 ..P@ppp.`. `.`.. R g b R g b R g b R g b 'B O D Y' 0060: A0A0A0A0 90E0C0C0 C0D0A000 424F4459 ............BODY Compacted length start of body data <- (Compression=1 above) 0070: 000163AC F8000F80 148A5544 2ABDEFFF ..c.......UD*... 0080: FFBFF800 0F7FF7FC FF04F85A 77AD5DFE ...........Zw.]. etc. Simple CAMG ViewModes: HIRES=0x8000 LACE=0x4 HAM=0x800 HALFBRITE=0x80 ( Release 2 ILBMs may contain a LONGWORD ViewPort ModeID in CAMG )