Building my own classic style computer update

I have been scrounging for parts for my computer, and I believe I have hit the jackpot. A friend of mine set me up with some older Seiko control system boards, various revisions, from the late 80s. On them are many ICs, including RAMs, Z80 CPUs, and PIOs, as well as some AMD Arithmetic processors, a Z80 SIO/2, and other various components. I want to try to make my computer from these components. Can anyone point me in a good direction for the datasheets, preferably online, for these mostly obsolete ICs? Some of them I don't even know what they are, and some I cannot find online, presumably because they are obsolete. Here's a partial list of them: NEC D780C NEC D770008AC-6 NEC D4364C-15L NEC D8251AC NEC D449C AMD AM9511A-1DC Sharp LH0081A Sharp LH0082 Intel 8339 Intel 8325 Intel K3235001 Zilog Z8442BPS Zilog Z8430BPS Thanks for any help