If you get the "Sorry, the file cannot be displayed. There seems to be a technical issue ..." error when trying to view an image, a workaround is to click on the cog icon in the upper right side of the media viewer, and then select "Disable Media Viewer". We are aware of the problem and are looking for a solution.
The 12RS11 is a 32K EPROM pack for the 1240 and 1241. The idea is that users can permanently save configurations by first uploading it to a controller using GPIB or RS-232 and then burn the data using a programmer. It is the exact same as the 12RS12, but it didn't come with EPROMs. It meant to use four Motorola 68766 or 68764 EPROMS.