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The ay-3-8912(a) is a sound renerating chip that is build in on severall 128kb types off the zx spectrum but also as seperate board for 48k specrum (emulation) It uses different ports on different boards like TS2068 (w/ clock 1.76475Mhz)(*) or european spectrums. On the 128Kb is uses port 49149 and 65533
http://en.wikipedia.org/wiki/AY-3-8912
(*)Sinclair Computer Hardware Factsheet