FORM ID:  ACBM  (Amiga Contiguous BitMap)

FORM Description:

FORM ACBM has the same format as FORM ILBM except the normal BODY chunk
(InterLeaved BitMap) is replaced by an ABIT chunk (Amiga BITplanes).

FORM Purpose:

To enable faster loading/saving of screens, especially from Basic, while
retaining the flexibility and portability of IFF format files.