[Info-vax] DEC Multia (UDB) issues

[glen herrmannsfeldt]

In comp.sys.dec Rich Jordan <jordan at ccs4vms.com> wrote:

(snip)
> If I remember correctly is #x36 bit parity RAM, 72-pin SIMMs, either
> 60 or 70 nanosecond FPO.  EDO does not work.  These were common in
> server class systems in the 486 and early pentium timeframe (I ran
> Compaq memory in my UDB back then).  

As well as I remember those days, parity was more common on EDO
than on FPM.  Well, it was about the time that people started
to feel that they didn't need parity, though IBM started it
with the original PC.  The higher-end systems kept it a little
longer, though.  One I had back then, given parity EDO SIMMs,
would do ECC if you installed them in pairs.  I do remember
SIMMs with 12 chips on them, each three bits wide for 36 bits.

> Pretty sure thats the same kind
> of SIMMs used in the Alphastation 200/Alphaserver 300/400 models too.
> Just be sure of the contact materials; I think UDB was one type and
> the Alphastations were the other type (tin vs gold); you want memory
> with the same contact material as the SIMM slots.  the #x36 SIMMs we
> used in other DEC equipment; DECserver 700s, other DECserver units,
> etc.  Those were probably mostly 1x36 (4MByte) SIMMs.

-- glen