Re: Commodore 15 Second disk format routine disassembled

From: André Fachat <afachat_at_gmx.de>
Date: Sat, 11 Apr 2026 10:25:08 +0200
Message-ID: <19d7ba50ea0.286d.b4d1f2b66006003a6acd9b1a7b71c3b1_at_gmx.de>
Am 11. April 2026 03:27:33 schrieb Jesus Cea <jcea_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

Very cool work by Dave!

That reminds me of the 12s format routine I once submitted to the German 
64er magazin.

It came back a remark on the paper 'bringen wenn funktioniert' which means 
publish it if it works. Which it didn't of course. I only had a single 1541 
to test on, so it was a classic 'works on my machine'.

I will certainly look into that routine!

André
>
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Received on 2026-04-11 10:00:02

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