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XF551 Hyper FX MOD


52 replies to this topic

#51 1050 OFFLINE  

1050

    Dragonstomper

  • 860 posts

Posted Sun Jan 14, 2018 4:39 AM

I've tried every mode and had troubles setting the mode
too. Literally at my wits end and she won't boot the
360K XF-551 disk with DOS.SYS on the backside. May have
been a flaky eprom doing most of my troubles.

But thanks for the run down on how to do it again and
I will try it again. But my takeaway is that I'm having
a lot of trouble with this and it shouldn't be so much
trouble.

#52 Nezgar OFFLINE  

Nezgar

    Moonsweeper

  • 337 posts
  • Location:Regina SK Canada

Posted Sun Jan 14, 2018 10:35 AM

I read on another thread that the double sided internal PBI drives in a 1450XLD would address side 2 as drive 2, and also write the data 'backwards' in a way that was compatible in a single sided drive when flipped.

Great ingenuity there that never made it out there!

#53 _The Doctor__ OFFLINE  

_The Doctor__

    River Patroller

  • 3,241 posts
  • Location:10-0-11-00:02

Posted Sun Jan 14, 2018 9:38 PM

One of the ideas for the 1450 drive was to buffer the whole track and write the data backwards from the buffer without switching rotation, since almost all copy protection was on disk intended to be drive1, this would make access faster on the extra drives and maintained compatibility across all the drives... copy protected disks worked fine on drive 1 and 3, and drives 2 and 4 could still read and write disk understood by all..... the buffer was key... without it...way too big of a performance hit.....






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