Does anyone knows what a two-port memory is

Nope,
but a quick search produced these:
http://www.freepatentsonline.com/4509115.html
http://www.actel.com/documents/PA3_E_SRAMFIFO_AN.pdf

Happy reading.

p.s. Alba-tross = Alba-Trews = white trousers.

The bird had what looked like the white trousers worn by the officers of the British navy.
Robert Burns likened the ruffs around the legs of certain birds to the frilly bottoms on the undergarments worn by ladies or the time.

Alba = white
Tross = trews, trous[ers], truss.