Cliff Lawson's page hasn't been monitored since early June, 2K. A lot of info on Amstrad comps, however. Cliff is a software eng. for Amstrad, so if he doesn't have the answer, he can probably find it. (If he ever starts back to monitoring his site.) Cruise the WHOLE site for info.
Pin-outs (note the hyphen) is a tremendous link site. Amstrad emulators, plus sites listed under: Systems>Amstrad. For a lot of generic info also, try here.