Anex86 PC98 floppy image - Revision history

Sembiance: /* Sample files */

2024-02-16T15:34:28Z

‎Sample files

Sembiance: /* Sample files */

2024-02-16T14:43:10Z

‎Sample files

Sembiance: /* Software */

2024-02-16T14:38:31Z

‎Software

Dexvertbot: Change telparia.com samples link to template

2023-12-28T02:55:15Z

Change telparia.com samples link to template

Sembiance: Added sample files

2022-08-15T02:50:31Z

Added sample files

Sembiance: Added software that can handle FDI images

2020-09-21T12:46:20Z

Added software that can handle FDI images

Sembiance: /* FDI File Header */

2020-09-21T12:45:09Z

‎FDI File Header

More barbeque at 00:25, 11 October 2018

2018-10-11T00:25:53Z

More barbeque: Created page with "{{FormatInfo | formattype = electronic | subcat = Disk Image Formats | extensions = {{fdi}} }} The FDI disk image format for NEC PC-98 disk images seems to or..."

2018-10-11T00:24:33Z

Created page with "{{FormatInfo | formattype = electronic | subcat = Disk Image Formats | extensions = {{fdi}} }} The FDI disk image format for NEC PC-98 disk images seems to or..."

New page

{{FormatInfo
| formattype = electronic
| subcat = Disk Image Formats
| extensions = {{fdi}}
}}

The FDI disk image format for NEC PC-98 disk images seems to originate from the Anex86 PC98 emulator.

== FDI File Header ==
The FDI header is 4096 bytes long, Intel little-endian, and starts with this 32-byte header.

typedef struct {
BYTE dummy[4];
BYTE fddtype[4];
BYTE headersize[4];
BYTE fddsize[4];
BYTE sectorsize[4];
BYTE sectors[4];
BYTE surfaces[4];
BYTE cylinders[4];
} FDIHDR;

The next 4,064 bytes of the header seem to always be pad bytes.

== FDI file image contents ==
The remaining portion of the file is a raw dd-style image of the disk. In the case of an HDM image, you can prepend a 4096-byte header onto the image to turn it into an FDI (see example below).

== Examples ==
For a 1261568-byte "2HD" disk image (like *.HDM format), the header is as follows:

{|class="wikitable"
!Field
!Value
!Comment
|-
|| dummy || 0 ||
|-
|| fddtype || 144 || Unsure what this value actually means
|-
|| header size || 4096 || Includes the 32-bytes in the header
|-
|| fdd size || 1261568 ||
|-
|| sector size || 1024 ||
|-
|| sector count || 8 ||
|-
|| surfaces || 2 || double-sided disk
|-
|| cylinders || 77 ||
|}

← Older revision		Revision as of 15:34, 16 February 2024
Line 66:		Line 66:

	== Sample files ==		== Sample files ==
−	* {{DexvertSamples\|archive/~~pc98FAT12~~}}	+	* {{DexvertSamples\|archive/fat12}}

← Older revision		Revision as of 14:43, 16 February 2024
Line 66:		Line 66:

	== Sample files ==		== Sample files ==
−	* {{DexvertSamples\|archive/~~anex86FDI~~}}	+	* {{DexvertSamples\|archive/pc98FAT12}}

@@ Line 38: / Line 38: @@
 * [https://github.com/barbeque/pc98-disk-tools PC98 Disk Tools]
 * [https://hp.vector.co.jp/authors/VA013937/editdisk/index_e.html DiskExplorer]
 == Examples ==

← Older revision		Revision as of 02:55, 28 December 2023
Line 65:		Line 65:

	== Sample files ==		== Sample files ==
−	* ~~https://telparia.com/fileFormatSamples/~~archive/anex86FDI/	+	* {{DexvertSamples\|archive/anex86FDI}}

← Older revision		Revision as of 02:50, 15 August 2022
Line 63:		Line 63:
	\|\| cylinders \|\| 77 \|\|		\|\| cylinders \|\| 77 \|\|
	\|}		\|}
		+
		+	== Sample files ==
		+	* https://telparia.com/fileFormatSamples/archive/anex86FDI/

@@ Line 34: / Line 34: @@
 == FDI file image contents ==
 The remaining portion of the file is a raw dd-style image of the disk. In the case of an HDM image, you can prepend a 4096-byte header onto the image to turn it into an FDI (see example below).
 == Examples ==

← Older revision		Revision as of 12:45, 21 September 2020
Line 24:		Line 24:

	The next 4,064 bytes of the header seem to always be pad bytes.		The next 4,064 bytes of the header seem to always be pad bytes.
		+
		+	fddtype values:
		+	0x10 1MB/640KB 2DD
		+	0x30 0xb0 1.44MB 2HD
		+	0x50 0xd0 320KB 2D
		+	0x70 0xf0 640KB 2DD
		+	0x90 1.2MB 2HD

	== FDI file image contents ==		== FDI file image contents ==

@@ Line 2: / Line 2: @@
 | formattype     = electronic
 | subcat         = Disk Image Formats
-| extensions     = {{fdi}}
+| extensions     = {{ext|fdi}}
 }}