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The XF Single Drive Upgrade
The XF 3.5 inch
Single Drive Upgrade for your XF551 disk drive will double your storage
space to 720kB by replacing your 5.25 inch, 360kB floppy with a new 3.5 inch,
720kB floppy disk drive. This is not to be confused with public domain
upgrades. Our custom chip and brain module provide true Ultra Speed
compatibility (extremely fast operation with compatible sector copiers and
DOSes), and eliminate incompatibilities with software. The upgrade is designed
so that it will work with a 5.25 inch drive should you ever need to switch
back to it.
Included in our kit is a high quality, 3.5 inch floppy drive mounted in a 5.25 inch frame so as to provide a perfect fit inside your XF551. Also included is a program which allows you to read IBM and Atari ST disks on your converted drive. Built-in text translation is featured for easy porting of PC/ST text files into 8-bit word processors.
In addition to the Puff upgrade Bob Woolley also did an upgrade that just modified a few bytes in the Atari Rom to make it work with the 720k Drives. Puffs upgrade is faster but Woolley upgrade requires only the 8k rom to be changed. In my eprom download area I have a copy of the Woolley rom that just need to be burn onto a chip.