SplitToFloppies

by Elmar Wenners / chaozz.nl / github.com/chaozznl

A PowerShell tool that compresses a folder, splits it into floppy sized chunks, and generates FAT12 IMG files suitable for vintage PCs with Gotek floppy emulators.

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Features

• Creates a ZIP archive from any folder
• Splits the ZIP into floppy‑sized binary chunks
• Generates FAT12 floppy images for each chunk
• Automatically copies each chunk into its own IMG file
• Supports all standard PC floppy formats (160 KB to 2.88 MB)
• Compatible with Gotek, FlashFloppy

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Requirements

• Windows with PowerShell
• mformat.exe and mcopy.exe from mtools (included in this repository)
• A valid mtools.conf (included)
• pkunzip or other unzip tool on the target system

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Supported Floppy Sizes

Size (KB)	Tracks	Heads	Sectors
160	40	1	8
180	40	1	9
320	40	2	8
360	40	2	9
720	80	2	9
1200	80	2	15
1440	80	2	18
2880	80	2	36

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Usage

Syntax

SplitToFloppies.ps1 <floppySizeKB> <sourceFolder> <outputFolder>

Example

.\SplitToFloppies.ps1 720 g:\doom8088\cga g:\doom8088\cga_split

Example Output

PS G:\mtools> .\SplitToFloppies.ps1 720 'G:\images\MS-DOS Software\GAMES\doom8088\VGA\' 'G:\images\MS-DOS Software\GAMES\doom8088\VGA_split\'
>> Step 1: Creating ZIP from folder...
>> Step 2: Splitting ZIP file into chunks...
>> Step 3: Creating UNSPLIT.BAT...
>> Step 4: Creating IMG files...
   - Creating DISK001.img...
   - Creating DISK002.img...
   - Creating DISK003.img...
   - Creating DISK004.img...

>> Ready.
>> 4 floppy images created in: G:\images\MS-DOS Software\GAMES\doom8088\VGA_split\
>> UNSPLIT.BAT added to last floppy image.
PS G:\mtools>

Installing on the Target PC

1. Mount the first IMG on a Gotek.
2. On the target PC, copy the contents into a working folder:

copy a:\*.* .

3. Mount the next IMG and repeat.
4. After all chunks are copied, unsplit the result by typing:

unsplit.bat

This will recreate the OUTPUT.ZIP file on the target system.

5. Extract using PKUNZIP:

pkunzip bigzip.zip