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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: freqmax on September 01, 2007, 01:37:14 AM

Title: Amiga floppy image format?
Post by: freqmax on September 01, 2007, 01:37:14 AM

Is there any truly free format that can handle copyprotected discs like the IPF format does?

I did some calculations on what a floppy image format would need:
Assumption: 300 rpm, 250 kbps
Max bits per one track on one side:
250000*(60/300)     = 50000 bits/trackside

The really raw format would be to use 7bit values (due to 2% rpm tolerance) with 4 us cycle time.

Assuming a max of 100 000 pulses/trackside the discimage would be:
  (100000*7)*2*80*(1/8)*(1/1024) = 13671.875 kByte

Using the MFM demodulated data, the size becomes:
  (50000)*2*80*(1/8)*(1/1024) = 976.5625 kByte

Title: Re: Amiga floppy image format?
Post by: adolescent on September 01, 2007, 01:50:17 AM

MFMWarp and WWarp can make images of copy protected disks.  But, most of the time the copy protection itself can't be preserved like the SPS tool does.

Title: Re: Amiga floppy image format?
Post by: freqmax on September 01, 2007, 02:10:47 AM

What's the SPS tool..?

If the copy protection can't be preserved, will the image still work for running the application?

Title: Re: Amiga floppy image format?
Post by: adolescent on September 12, 2007, 12:31:31 AM

@freqmax

The SPS (formerly known as CAPS) tool is the tool is what creates IPF files.

To answer your other question, I don't know.  I don't have a drive that's good enough to write things back to test.