[sdiy] RAS/CAS timing

[fmg]

List

A friend sent to me several 'defunct' 286 motherboards some time ago.
This weekend I check them and found one still functioning, then I
used this MB to check the RAMs of the others ones and found that ALL
are working ok. I'm planing now to build a digital delay/echo for
audio and maybe CV/ENV with them but, and thats why I'm wrinting this,
is there any schematic that help me to achieve the goal ?  I 'google'
for hours without lucky.
I'm asking this cause I never built a board involving RAMs and, as I
see in datasheets, don't want to ruin my life trying to design 
RAS/CAS/WE/Mux timings. (well, it's already ruined but don't want go
further...)
I know there are memory controllers that do all the job but if I
could do with simple gates/inverters that's would be great,
where I live trying to buy a digital IC other than 4000s are
impossible !  (hope I'm no asking for so much)

The chips are:
1Mb x 1b -  TMS4C1024, GM71C1000, KM41C1000 (all pin compatible)
256Kb x 4b -  MT4C4256, HM514256, HY534256, V53C104  (  "  )

Any help appreciated

Fabio Gonzalez