Re: XLT366 Memory Compatiblity...

[Thorsten Kranzkowski <dl8bcu@dl8bcu.de>]

On Tue, Jun 08, 2004 at 08:03:35PM +0200, Jan-Benedict Glaw wrote:
> On Tue, 2004-06-08 17:56:12 +0000, Thorsten Kranzkowski <dl8bcu@dl8bcu.de>
> wrote in message <20040608175612.B31492@Marvin.DL8BCU.ampr.org>:
> > On Tue, Jun 08, 2004 at 02:52:50PM +0200, Jan-Benedict Glaw wrote:
> > > On Tue, 2004-06-08 05:46:54 -0600, Ryan Kirkpatrick <linux@rkirkpat.net>
> > > wrote in message <Pine.LNX.4.21.0406080536550.13212-100000@magellan.rkirkpat.net>:
> > > > utilized they work fine. When fully utilized, they just don't work.
> > > 
> > > As I said, parity != ECC.
> > 
> > well he said 36 chips which equals 4 bit ECC per 32 bit word.
> 
> Or one bit per byte... *digging up some RAM* Ah, these do have 10 or 20
> chips, so that's 2 bits per byte (which I expected).

Quoting from my DS20 manual (DP264 actually):

"The 72-bit, 100 MHz DIMMs consist of 64 Bits of data and 8 bits of ECC, ..."

These are 200 pin sticks which are definitely not found in PC World :)

I assume Ryans memory is bog-standard 72Pin-PS/2 (currently googling to 
find a proof) and also with that it's definitely 4bits/32bit. Quoting
from ref_memory.txt that describes my noname-board:

Table 3-1 Possible Memory Capacities

Organization  SIMM      Bank      BCR<SBE>   BCR<RAS>  BMR
              size      size
----------------------------------------------------------------
1 Mbit x 36   4 Mbyte   8 Mbyte   0          0011b     0070.0000
2 Mbit x 36   8 Mbyte   16 Mbyte  1          0011b     00F0.0000
[...]



Unfortunately most useful Alpha docs seem to be gone by today - the 
closest I could find is: 
http://hvdkooij.xs4all.nl/docs/RedHatLinuxAlpha/machinexlt.html 
which also suggests 36 Bit RAM.


Now I'm curious what kind of RAM-Sticks _you_ found in your black-box?
are all (10,20) chips of the same size and type? Any stickers that
suggest a clue?


> Melle? Not all that far away:) I'm from Hörste (near Halle/Westf.).

Ein freundliches Hallo nach Nordrhein Westfahlen! ;-)
 
> MfG, JBG

Bis denn,
Thorsten


-- 
| Thorsten Kranzkowski        Internet: dl8bcu@dl8bcu.de                      |
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