XF551 Indexlochabfrage - Indexhole Detection Upgrade#

The Atari XF551 disk drive was the first to use an industry standard drive mechanism which was capable of true double sided operation. However, many 1050 owners use the back sides of their disks by simply flipping the disk over and notching a write protect hole. Since the XF551 uses the index hole on the disk, flipping a disk over and formatting it is not possible. In 1991 German company EDV Computer Shop created the Indexlochabfrage D-503. This small PCB could be built into the drive mechanism and simulates the detection of the indexhole. As a result XF551 owners could flip the disk and write to it just like the 1050 and 810 drives.


XF551 Indexlochabfrage - Indexhole Detection upgrade/Indexlochabfrage1.JPG
XF551 Indexlochabfrage - Indexhole Detection upgrade/Indexlochabfrage2.JPG


Including schematics

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Kind Attachment Name Size Version Date Modified Author Change note
Indexlochabfrage1.JPG 160.3 kB 1 28-Aug-2017 18:58 Fred Meijer
Indexlochabfrage2.JPG 151.0 kB 1 28-Aug-2017 18:58 Fred Meijer
Indexlochabfrage_Manual.pdf 133.3 kB 1 28-Aug-2017 18:59 Fred Meijer
« This page (revision-2) was last changed on 03-Feb-2023 16:21 by Fred Meijer  
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