Adapting digital RGBI monitor to accept analog RGB

I am in possession of two Magnavox (North American Philips) CM8562 monitors. Out of the box they handle composite and digital RGBI (CGA) input. What I'd like to do is get one to handle analog RGB (like arcade boards, Amiga, Atari ST, and Apple IIGS put out). I wouldn't think this was possible, but I seem to have a certain memory that I saw mention of doing just that *somewhere* on the web a few years ago, even though I can't find that mention now. According to the rather unwieldy chart at http://gona.mactar.hu/Commodore/monitor/Commodore_monitors_by_model_number.… , the service manual and schematic for the Commodore-branded 1084 and 1084S-P is "also good for Magnavox ... CM8562". I assume this means the monitors are basically the same underneath. Both of those Commodore monitors support analog RGB. However, when I look at the service manuals provided for those, they specifically state in several places that parts of the manual referring to analog RGB do not apply to the CM8562. Also, according to http://www.retrocomputing.net/parts/commodore/1084S-P1/docs/1084p/readme.txt , there are two chassis designations, which both confusingly include the string "CM8562": CM8505/CM8562/CM8705/CM8762, 8CM505/8CM515/8CM542/8CM643 on the one hand; and 8CM542/CM8562/CM8762 on the other. The latter is noted as only accepting digital RGBI. Physically, both monitors I have have an 8-pin DIN input for the digital RGBI, and a circular area with the legend "lin RGB" underneath. One one monitor, that circular area is perforated; on the other one, it's just a circle but with no indication that it can be easily knocked out. I have not yet opened either one. So... does anyone know if these monitors can in fact be made to accept analog RGB? Or have a way I could tell after opening them up? And, of course, I'd like instructions on just how to do it, if it is possible. -- Eric Christopherson