Quality 99 Software wanted

[+acadiel]

Does anyone have disk images of these three apps? I believe they used some sort of rudimentary copyright protection. My disks are unreadable.

 

[+acadiel]

I think Tapatalk might have posted this twice. If so please delete one.

[Flottmann1]

here any Qualitysoft Discs with

 

Draw N Plot

Sdump

Diskmgr4

Quickcopy

Tools.rar

[+Ksarul]

Quality 99 Software would always leave one sector on one of the unused tracks unformatted and set pointer-wise to the number of one of the other sectors on the track. Then the program would try to access the sector several times as a test--if at least one of the tests hit the bad sector, the program assumed the disk was genuine. If all attempts found the sector--it assumed the disk was fake and exited the program.

[Flottmann1]

and the DM3, run XB (Load)

DiskManager3.dsk

Edited February 18, 2018 by Flottmann1

[+InsaneMultitasker]

http://atariage.com/forums/topic/229041-fiads-or-doads-dsk-images-or-zips-your-favorite-here/?do=findComment&comment=3059170

[+acadiel]

All of you rock, thank you!!!

[apersson850]

I remember I spoke with Maurice E.T. Swinnen when I had figured out how the copy protection worked. He laughed a bit and said "I appreciate if you keep it to yourself."