OS/2 Boot Logo - Revision history

Sembiance: /* Sample files */

2023-12-28T15:13:13Z

‎Sample files

Jsummers: /* Software */

2022-11-06T15:55:14Z

‎Software

Jsummers at 18:41, 26 May 2022

2022-05-26T18:41:32Z

Jsummers at 18:06, 4 April 2022

2022-04-04T18:06:26Z

Jsummers: Category:Booting

2017-08-15T14:45:57Z

Category:Booting

Jsummers at 15:29, 4 December 2016

2016-12-04T15:29:17Z

Jsummers: Created page with "{{FormatInfo |formattype=electronic |subcat=Graphics |extensions={{noext}}, {{ext|lgo}} |released=1994 }} '''OS/2 Boot Logo''' is a compressed raster graphics format used for ..."

2016-11-16T13:24:52Z

Created page with "{{FormatInfo |formattype=electronic |subcat=Graphics |extensions={{noext}}, {{ext|lgo}} |released=1994 }} '''OS/2 Boot Logo''' is a compressed raster graphics format used for ..."

New page

{{FormatInfo
|formattype=electronic
|subcat=Graphics
|extensions={{noext}}, {{ext|lgo}}
|released=1994
}}
'''OS/2 Boot Logo''' is a compressed raster graphics format used for the logo shown when OS/2 Warp operating systems boot. Images are 640×400 (Warp 3), or 640×480 (Warp 4), with 16 colors.

The file used by the operating system is named "OS2LOGO", with no filename extension. Inactive logo files are conventionally given the extension '''.lgo'''.

No public format specifications are known.

== Software ==
* [https://pmview-pro.en.softonic.com/ PMView Pro]
* [http://cd.textfiles.com/hobbesos29804/disk2/WPSUTIL/PLOGO100.ZIP PrepLogo] (OS/2 software; write-only)
* ''MAKELOGO'' - A utility on the IBM OS/2 Developer Connection CDs, which can create a logo file from raw bitmap files
* [http://heikon.home.tlink.de/ GBM] → GBMLOGO (write-only; requires MAKELOGO)
* [http://cd.textfiles.com/hobbesos29804/disk1/GRAPHICS/BMP2LOGO.ZIP BMP2LOGO.ZIP] (OS/2 software; write-only; requires MAKELOGO)

== Sample files ==
* [http://cd.textfiles.com/hobbesos29804/disk2/WPSUTIL/PLOGO100.ZIP PrepLogo] → logos.zip
** [http://cd.textfiles.com/hobbesos29804/disk2/SYSUTIL/WARPLOGO.ZIP WARPLOGO.ZIP] - Older version of the above?
* http://www.altsan.org/os2/graphics/index.html
* [http://www.oldzipsarchive.dreamhosters.com/os-2/warp4-1.dsk/os2logo os2logo]

[[Category:OS/2]]
[[Category:File formats with a distinctive filename]]

@@ Line 8: / Line 8: @@
 The file used by the operating system is named "OS2LOGO", with no filename extension. Inactive logo files are conventionally given the extension '''.lgo'''.
 == Format details ==
-''This is an incomplete, and possibly inaccurate, description of the format.''
+The image data is separated into four bit-planes, each of which is compressed with the [[EXEPACK2]] scheme.
-−
-The image data is separated into four bit-planes, which are compressed and stored separately.
 The file begins with a 32-byte header of 8 four-byte integers: the file offset of plane 0, the length of plane 0, the offset of plane 1, the length of plane 1, and so on.
 This is the VGA palette used by GBM:
@@ Line 48: / Line 24: @@
 * [http://heikon.home.tlink.de/ GBM] → GBMLOGO (write-only; requires MAKELOGO)
 * [http://cd.textfiles.com/hobbesos29804/disk1/GRAPHICS/BMP2LOGO.ZIP BMP2LOGO.ZIP] (OS/2 software; write-only; requires MAKELOGO)
 == Sample files ==

@@ Line 20: / Line 20: @@
 A compressed plane of data seems to consist of a sequence of elements, each of which begins with an opcode byte, followed by a variable number of data bytes.
-GBM says that it uses EXEPACK compression, but this is unconfirmed, and there are several different versions of EXEPACK.
+GBM says that it uses [[EXEPACK]] compression, but this is unconfirmed.
 This much is known about an element:

← Older revision		Revision as of 14:45, 15 August 2017
Line 56:		Line 56:

	[[Category:OS/2]]		[[Category:OS/2]]
		+	[[Category:Booting]]
	[[Category:File formats with a distinctive filename]]		[[Category:File formats with a distinctive filename]]

← Older revision		Revision as of 15:29, 4 December 2016
Line 10:		Line 10:

	No public format specifications are known.		No public format specifications are known.
		+
		+	== Format details ==
		+	''This is an incomplete, and possibly inaccurate, description of the format.''
		+
		+	The image data is separated into four bit-planes, which are compressed and stored separately.
		+
		+	The file begins with a 32-byte header of 8 four-byte integers: the file offset of plane 0, the length of plane 0, the offset of plane 1, the length of plane 1, and so on.
		+
		+	A compressed plane of data seems to consist of a sequence of elements, each of which begins with an opcode byte, followed by a variable number of data bytes.
		+
		+	GBM says that it uses EXEPACK compression, but this is unconfirmed, and there are several different versions of EXEPACK.
		+
		+	This much is known about an element:
		+
		+	{\| class="wikitable"
		+	! Opcode (N)
		+	! Following bytes
		+	! Description
		+	\|-
		+	\|0 \|\| 0 \|\| End-of-data marker
		+	\|-
		+	\|0 \|\| ''count'', ''val'' \|\| RLE: Emit ''count'' bytes of value ''val''.
		+	\|-
		+	\|N mod 4 = 0 \|\| ... \|\| Uncompressed: Emit the next N/4 bytes literally.
		+	\|-
		+	\|other \|\| ... \|\| Unknown; apparently one or more other (LZ?) compression methods
		+	\|}
		+
		+	This is the VGA palette used by GBM:
		+	#000000,#000080,#008000,#008080,#800000,#800080,#808000,#808080,
		+	#cccccc,#0000ff,#00ff00,#00ffff,#ff0000,#ff00ff,#ffff00,#ffffff

	== Software ==		== Software ==

@@ Line 32: / Line 32: @@
 * http://www.altsan.org/os2/graphics/index.html
 * [http://www.oldzipsarchive.dreamhosters.com/os-2/warp4-1.dsk/os2logo os2logo]
 [[Category:OS/2]]
 [[Category:Booting]]
 [[Category:File formats with a distinctive filename]]