QMS 1660 Reference Manual page 166

4 Insert the SIMM into the SIMM connector.
Hold the SIMM at a 45° angle to the controller board, with the
notch on the right side. Slide the SIMM into either SIMM connec-
tor, and then push gently on it to make sure it is securely seated
in the connector.
Note: You can insert a SIMM in either SIMM connector as long as
»
DRAMØ, the SIMM connector closest to you, is occupied.
"DRAMØ" is marked on the controller board for ease of
identification.