I too lived in Yamate Cho from about 1961 to 1965.Of course, I was very young, about 8 years old when we left.
My dad thinks we lived at 223B Yamate Cho or Yamamoto Cho...since all the maps on Google Earth and Microsoft Earth are in Kangi I can't read any of them.
Still, I think I found it, that and the Bluff Hospital, now a clinic, the foreign cemetery where we used to play among the headstones (my friend leslie's family lived across the street and his dad owned a bunch of properties and was big in real estate in the area), the International School where I went from K to Grade 1 or 2 and the infamous YCAC where we seemed to spend mosts of our time. My dad was big on field hockey and cricket there, mum played tennis and I hung out at the pool, the bowling alley or in the restaurant ordering cokes and cinnamon toast on my Dad's tab until he got the bill at the end of the month!
Anyway, I'm trying to put together a Google or MS Earth tour for my dad who is 79 now and would love to see how the area has developed.
223B was the second house in from the corner, just before the bridge that went over the main road leading to Yokohama. If you turned left and went down the hill before the bridge you would end up at the start or Motomatchi. To your right was the road to the Bluff hospital and YCAC and to your left was the road through the district to the US base and immediately in front of you, if I recall was the tram terminal.
It's all gone now, from what I can see on the satellite and maps but any clues would be appreciated.