[sdiy] RAS/CAS timing (delay/echo)

[fmg]

I've collected enough info to start with this
project, (this include the memory section of an old
RCA weather radar 8-)
Being most of my diy projects just 'weekend
activities', I never know when will finish them...

This post is just to waste some bandwidth and
to thanks for the replies.

Fabio Gonzalez

fmg wrote:
> 
> 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