AMOS Sprite Bank

File Format
Name	AMOS Sprite Bank
Ontology	Electronic File Formats Graphics AMOS Sprite Bank
Extension(s)	.abk

AMOS Sprite Bank is a raster image file format associated with the AMOS Professional and Easy AMOS programming languages and compilers for Amiga computers. The format may also be known as Object Bank or Bob Bank.

AMOS Icon Bank is a very similar format.

Note that other types of AMOS files also use .abk filename extension.

Identification

Files begin with ASCII characters "AmSp".

AMOS Sprite/Icon Bank format

A sprite bank and an icon bank share very similar attributes. They define graphic data which can be drawn onscreen. They have this format:

Field	Length
Bank identifier: AmSp for sprites (bank 1) or AmIc for icons (bank 2)	4 bytes
Count of sprites/icons to follow	2 bytes
Sprites/Icons. Each sprite or icon has this format: 2 bytes: width, in 16-bit words (multiply by 16 to get width in pixels) 2 bytes: height, in raster lines (pixels) 2 bytes: depth, in bitplanes (1 to 5) 2 bytes: hot-spot X co-ordinate 2 bytes: hot-spot Y co-ordinate width * height * depth * 2 bytes: Amiga planar graphic data
Color palette: 32 16-bit colors in 0x0RGB form, the Amiga COLORx hardware register format	64 bytes

Specifications

• AMOS Pro User Guide → Memory Bank Structures

Software

• amosbank
• Java AMOS Sprite Bank Viewer

Sample files

• Most of the files at http://cd.textfiles.com/amospd/Sprites/
• http://sourceforge.net/projects/javaamosabk/files/abk/ (e.g. Mouse.Abk)
• teletube_h.abk

Links

• Wikipedia: AMOS
• AMOS file formats