Pictures of different versions of the Floppy-Speeder Professional-DOS taken from articles and advertisements

The table below shows some pictures of different Professional-DOS PCBs.

Take note the broad form PCB (not the well known long one), that may be a prototype version.

C1541 Professional-DOS drive expansion boards	Web picture, 150 dpi	Download, 600 or 1200 dpi
Early version (prototype?) of a Professional-DOS hardware board (taken from 64'er, issue 08/1986, page 22, upper right corner)	529x372, 122 kB	2116x1488, 1427 kB
Another scan (available with 1200dpi) of the 08/1986 64'er article	537x407, 115 kB	4294x3260, 1369 kB
Picture of the Professional-DOS Release variant (taken from a hardware test article of 64'er, issue 05/1987, page 26, upper right corner)	527x413, 77 kB	2109x1651, 1165 kB