Commodore 15 Second disk format routine disassembled

From: Jesus Cea <jcea_at_jcea.es>
Date: Sat, 11 Apr 2026 03:16:48 +0200
Message-ID: <939e3ded-8e9e-160b-101f-22a298bf8892_at_jcea.es>
You could be interested in this:

https://x.com/commodoreihs/status/2040555413326672219


"""
It took over a minute and a half to format a new disk using the native 
Commodore 64 / 1541 disk drive commands. Mike J. Henry of Starpoint 
Software and Basement Boys Software (Fast Hack-'em) fame wrote a 15 
second format routine, which was apparently at some point modified by 
Alf Maier. I don't know exactly what Alf modified, but I think this was 
widely distributed on QuantumLink in the mid-to-late 80s.
You can download the program from Bo Zimmerman's site here:
https://zimmers.net/anonftp/pub/cbm/c64/diskutil/routines/Format%2015%20seconds.prg

I disassembled the code and uploaded the result to GitHub:
https://github.com/commodoreihs/15_second_format/tree/main

Does anyone know the precise history of 15 second format?
"""

https://github.com/commodoreihs/15_second_format/tree/main


https://zimmers.net/anonftp/pub/cbm/c64/diskutil/routines/Format%2015%20seconds.prg


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Received on 2026-04-11 03:00:02

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