What are these ?

[SunDown79]

Can someone tell me what these are ? : http://picasaweb.google.com/stefan.mnsr/TeKoop#5255239018217937906
I know they are DEC but dont know what they are precisely.

 

[pontus]

Can someone tell me what these are ? : http://picasaweb.google.com/stefan.mnsr/TeKoop#5255239018217937906
I know they are DEC but dont know what they are precisely.

I'm not sure, but they look a lot like the RL01/RL02 drive selector plug. In the case of RL01/2 you put it in a fitting hole in the front of the drive and the physical shape of the plug determines the number the drives uses to identify itself (or answer to, not sure).

The one in your pictures looks wider, the RL01/2 plugs are square.

 

[SunDown79]

I found out; these are RA60/81 READY indicators.
See www.pdp11.nl (thanks to Henk for helping out).