https://wiki.amigaos.net/w/index.php?action=history&feed=atom&title=ACBM_IFF_Amiga_Continuous_BitmapACBM IFF Amiga Continuous Bitmap - Revision history2026-05-06T17:09:01ZRevision history for this page on the wikiMediaWiki 1.43.0https://wiki.amigaos.net/w/index.php?title=ACBM_IFF_Amiga_Continuous_Bitmap&diff=2976&oldid=prevSteven Solie: Created page with "<pre> Amiga Contiguous Bitmap form IFF FORM / CHUNK DESCRIPTION ============================ Form/Chunk ID: FORM ACBM (Amiga Contiguous BitMap) Chunk AB..."2012-06-08T19:45:05Z<p>Created page with "<pre> Amiga Contiguous Bitmap form IFF FORM / CHUNK DESCRIPTION ============================ Form/Chunk ID: FORM ACBM (Amiga Contiguous BitMap) Chunk AB..."</p>
<p><b>New page</b></p><div><pre><br />
Amiga Contiguous Bitmap form<br />
<br />
IFF FORM / CHUNK DESCRIPTION<br />
============================<br />
<br />
Form/Chunk ID: FORM ACBM (Amiga Contiguous BitMap)<br />
Chunk ABIT (Amiga BITplanes)<br />
<br />
Date Submitted: 05/29/86<br />
Submitted by: Carolyn Scheppner CBM<br />
<br />
<br />
FORM<br />
====<br />
<br />
FORM ID: ACBM (Amiga Contiguous BitMap)<br />
<br />
FORM Description: <br />
<br />
FORM ACBM has the same format as FORM ILBM except the normal BODY<br />
chunk (InterLeaved BitMap) is replaced by an ABIT chunk (Amiga BITplanes). <br />
<br />
FORM Purpose:<br />
<br />
To enable faster loading/saving of screens, especially from Basic,<br />
while retaining the flexibility and portability of IFF format files.<br />
<br />
<br />
CHUNKS<br />
======<br />
<br />
Chunk ID: ABIT (Amiga BITplanes)<br />
<br />
Chunk Description:<br />
<br />
The ABIT chunk contains contiguous bitplane data. The chunk contains<br />
sequential data for bitplane 0 through bitplane n.<br />
<br />
Chunk Purpose:<br />
<br />
To enable loading/storing of bitmaps with one DOS Read/Write per<br />
bitplane. Significant speed increases are realized when loading/saving<br />
screens from Basic.<br />
<br />
<br />
SUPPORTING SOFTWARE<br />
===================<br />
<br />
(Public Domain, available soon via Fish PD disk, various networks)<br />
<br />
LoadILBM-SaveACBM (AmigaBasic)<br />
Loads and displays an IFF ILBM pic file (Graphicraft, DPaint, Images).<br />
Optionally saves the screen in ACBM format.<br />
<br />
LoadACBM (AmigaBasic)<br />
Loads and display an ACBM format pic file.<br />
<br />
SaveILBM (AmigaBasic)<br />
Saves a demo screen as an ILBM pic file which can be loaded into<br />
Graphicraft, DPaint, Images.<br />
</pre></div>Steven Solie