PS/55 is the name of Microchannel computers once sold by IBM Japan. Some models were analogous to PS/2 and the others were designed by IBM Japan and sold mainly inside Japan.
Main purpose of this site is introducing Japanese unique MCA computers and adapters to Non Japanese MCA freaks. Japanese readers who want to know about PS/55s, I recommend you to visit FIBMJ Message Bulletin Board #4, PS/55 & PS/2, held by @Nifty. The bulletin board #4 is seemed to be inactive now, but you can get log files in LZH format. As far as I can see, the Big Blue Japan does not provide any information about their great products.
All information stored in following pages are mostly based on my experiences and information from various members of @Nifty MCA Forum. Please keep in mind that I'm not an engineer nor a programmer, hence there would be some, or many, misunderstandings about MCA and computers...
I'm not responsible for any damage or any inconvenience brought through the information written in my pages.
Image of this site has been stolen from the web site created by Louis Ohland, an incredible MCA man.
For detailed information about PS/2, check his web site which is now mirrored by many MADs. If you need basic and general information about MCA, check Peter Wendt's Web site. If you need more information or reference images for any specific PS/55 models, please feel free to email me (unspam adjustment needed).