Semi-Virtual Diskette (SVD) - Links to Floppy Images

Semi-Virtual Diskette (SVD)
Links to Floppy Images

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TRS-80 - Heathkit/Zenith - Apple - TI99
TRS-80 Model 1 - Links to Images

www.trs-80.com - The consumate site for TRS-80. Includes images, manuals, magazines, everything!

File Extension Common Machine Description
.dmk TRS-80 1/3/4 The .dmk format is quite common for TRS-80 disk images. Originally named for its creator, David Keil, this format is a raw image of the bytes found on a TRS-80 diskette. This includes sector headers and such, although special clocks and bit transitions for FM or MFM are not represented. Most copy-protected diskettes can be represented in this format.
.jv1 TRS-80 1/3/4 Name for its creator, Jeff Vavasour, the .jv1 format is a simple contiguous set of floppy sectors. .jv1 is only used for single-sided single-density diskettes, and normally only for Model I files.
.jv1 TRS-80 1/3/4 Also named for its creator, Jeff Vavasour, the .jv3 format includes custom header information in addition to sector data. This allows some copy-protected images to be represented. Double-density diskettes are often represented in this format.
.dsk TRS-80 1/3/4 All of the above formats (.dmk, .jv1, .jv3) can have the .dsk extension. Fortunately, due to the very different formats, the SVD can determine which format is in a .dsk file.

TRS-80 Model 3/4 - Links to Images

www.prowler-pro.com/coco - Mike Snyder's Coco Quest, a site for TRS-80 Color Computer 2 and 3 (COCO2 and COCO3) programs. Mike wrote dozens of games between 1987 and 1991 which were sold to and distributed by T&D Subscription Software of Holland, Michigan. He has obtained permission to release his COCO games to the public - so they may live forever.

http://www.fidalgo.net/%7Efirebug/coco/coco.html - Bugster's CoCo Page - with a few games.

File Extension Common Machine Description
.jvc TRS-80 CoCo Name for its creator, Jeff Vavasour, the .jvc format is a hybrid of a simple contiguous set of floppy sectors and optional header information. In most cases, there is no header information and the image file contains 18-sector 256-byte contiguous data for 35 or 40 tracks.
.dsk TRS-80 CoCo Often used in place of .jvc in filenames. Unfortunately, the .dsk extension is extremely popular and makes guessing the format of disk images problematic. The SVD does a pretty good job of it, however.

Heathkit H8 - Links to Images

www.sebhc.org - It's rather tough to find Heathkit H8/H89 images...unless you know where to look. Jack Rubin and friends have created a great Heathkit site dedicated to preserving the old hardware and software. You must subscribe to the SEBHC user group to get to the archive. See this web-page for information about how to do so.

File Extension Common Machine Description
.h17 Heathkit One of the original formats for Heathkit H8/H89 floppy images, .h17 is a text-based (read "big") format that contains a sector by sector hex dump of the data on the disk. It includes descriptive information about the disk in the title as well. One of the nice things about this format is that it preserves the volume number of the diskette even if it is a CP/M diskette. For HDOS diskettes, the volume number is elsewhere on the image.
.h8d Heathkit The compact analog to the .h17 format is the binary .h8d format. This format is a binary dump of contiguous sectors from the floppy. It is assumed that there are 35 tracks of 10 256-byte sectors. So the size of these files is fixed. Note that this format is easily confused with many other binary dump formats. But, again, the SVD sorts things out pretty well...in this case based upon the file extension.

Heathkit H89 - Links to Images

www.virtualapple.org - Virtual Apple 2 online disk archive. This site allows you to run disk images in an emulated apple in a Java window as well as download the disk images themselves. Go all of the way to the bottom of each program's page to find the image links.

www.faddensoft.com - CiderPress is a great program that will help you manage your Apple images. It can convert from one format to another as well as list the contents of files, as well as a hundred other things I haven't mentioned. It is REALLY nice for extracting images from ShrinkIT archives.

www.brielcomputers.com - Replica I - I just had to put a link in to Vince's Replica I! Take a look, or contact Vince at vbriel@yahoo.com

ftp://ftp.apple.asimov.net/pub/apple_II/images/ - Many diskette images can be found here.

Apple Image File Formats

You will find Apple diskette image files of many types. Fortunately, a set of standard images have emerged:
File Extension Common Machine Description
.do Apple ][ This extension refers to DOS Ordered sectors. The data in this type of image is that only of the sector's data. In fact, the file is simply each sector of the diskette packed end to end. The SVD software understands this type of file and can order the sectors appropriately.
.po Apple ][ This extension refers to ProDOS Ordered sectors. The data in this type of image is that only of the sector's data. In fact, the file is simply each sector of the diskette packed end to end. This file type looks JUST like the .do except that the SVD assumes a different ordering for the sectors.
.dsk Apple ][ Often, the .dsk extension is used in place of .do. But sometimes, it will refer to .po. The SVD software will assume it is the same as .do, because it can't currently descriminate between the two. So if a .dsk won't work, try renaming it to have the .po extension.
.nib Apple ][ The NIBble format is made up of raw sector transitions that would occur on the Apple diskette. Since it is this raw format, most copy-protected disk images will use it. The SVD software translates this image file directly to the hardware without changes.
.shk Apple ][ Often you will see files with the ShrinkIT extension. The SVD software cannot handle this type of file directly. You will need to use either a ShrinkIT utility to unpack the file, or simply use CiderPress.

TI99/4a - Links to Images

www.99er.net - A poplular place for TI99 images and information.

ftp://ftp.whtech.com - There are MANY disk images here of all types. Note, however, that they are named in many different ways and you may need to rename them to get them to work with the SVD.

File Extension Common Machine Description
.v9t9 TI99/4a This format is also known by .t99 and .tidisk. It is a binary data format with contiguous sectors. There is no header information and it is, therefore, impossible to distinguish between DS SD and DD SS images looking only at the size of the file. These files are normally 40 tracks with 9 sectors and in single density.
.pc99 TI99/4a The .pc99 format is a raw dump of disk sector data and includes sector header information.
.dsk TI99/4a Both .pc99 and .v9t9 formats can be named a .dsk file. This often raises issues because the SVD finds it hard to distinguish between these file formats and many others. When using these formats, it is wise to name with an extension of something other than .dsk.