[sdiy] RAS/CAS timing

[phillip m gallo]

Fabio,

Unless i mis-understand, i see no reason to worry about the DRAM component
as the 286 motherboard has already implemented interface for these
components, just stuff in the EDO DRAMS.

What you need to implement is the ADC/DAC component and the software.  You
could save your self some headache by installing an old 16 bit soundboard
like a Media Vision, or Gravis UltraSound (or even a SBlaster 16) as these
cards are heavily supported in the public domain programming word for both
"assy" and "C" language approaches.  Many ready to go programs for FFT,
Delay, and Tone generation exist from which you could, crib, learn, or use.
Most of these programs execute under Ms-DOS to increase the level of
determinism required for use.

regards,
p

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
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