🚀 go-pugleaf

Harry Broomhall <haeb@pc60.demon.co.uk> wrote in article
<354ed9c8.3731000@netbsd.haeb.demon.org>...

>    Are there 8 or 9 chips on each stick?   If 8 then they are
> non-parity, if 9 then parity.  They are 70ns.  BUT - they are Fast
> Page mode units, not EDO.

There are also non parity 72 pin things that have 2 or 4 chips.

My first 8Mb SIMM had 4 chips as has the pile I've since accumulated.

The 4x16Mb I've got for my beast have 8 chips each.

Probably just depends where you bought it.

TB

On Mon, 27 Apr 1998 17:26:54 +0100, "Tom Bird"
<hamster@nospam.demon.co.uk> wrote:

>Harry Broomhall <haeb@pc60.demon.co.uk> wrote in article
><354ed9c8.3731000@netbsd.haeb.demon.org>...
>
>>    Are there 8 or 9 chips on each stick?   If 8 then they are
>> non-parity, if 9 then parity.  They are 70ns.  BUT - they are Fast
>> Page mode units, not EDO.
>
>There are also non parity 72 pin things that have 2 or 4 chips.
>

   True - but my maths on his original post suggested that he had to
have 8 or 9 chip SIMMs.


    Regards,
            Harry.

On Sun, 26 Apr 1998 20:51:23 GMT, jason@thainjm.demon.co.uk (Jason
Thain) wrote:

>It's currently got:
>
>Two 72 pins SIMMS of 4MB each and 2 spare slots (so I'd like to put in
>two more 4MB SIMMS for a total of 16MB).
>
>The sticker on them says "Compaq Part: 160019-003. (It's not a Compaq
>PC!).
>
>I think they are probably 70ns, based on looking at the markings on
>the chips (Goldstar GM71C4400BJ70  9507 KOREA).
>
>The rear of the SIMMS are marked Goldstar E71042   GS19447
>
>I don't know whether or not the chips have parity.
>

   Are there 8 or 9 chips on each stick?   If 8 then they are
non-parity, if 9 then parity.  They are 70ns.  BUT - they are Fast
Page mode units, not EDO.

>Plus I don't understand the notation listed in the mags.
>
>i.e. 
>
>Non-parity 1MB x 32 SIMMS 60 ns (4MB) - how is this so?

  A byte is 8 bits - so 32 bits is 4 bytes. So 1Mb x 4 = 4Mb.

>Parity 1MB x 36 SIMMS 60 ns (4MB) - how is this so?
>

  4 extra bits for parity - otherwise same calculation.

>I know I can use the 60 ns memory and it will run at the speed of the
>slowest memory on the board (i,e, 70 ns), but I don't know what to do
>about parity.
>

   Best to match what you already have.  This means getting Fast Page
mode SIMMs.  You may find resistance from dealers about this - but
insist.  60ns is OK to mix with these though.

   Regards,
            Harry.

Harry Broomhall <haeb@pc60.demon.co.uk> wrote in article
<35491049.2146908@netbsd.haeb.demon.org>...
> On Mon, 27 Apr 1998 17:26:54 +0100, "Tom Bird"
> <hamster@nospam.demon.co.uk> wrote:
> 
> >Harry Broomhall <haeb@pc60.demon.co.uk> wrote in article
> ><354ed9c8.3731000@netbsd.haeb.demon.org>...
> >
> >>    Are there 8 or 9 chips on each stick?   If 8 then they are
> >> non-parity, if 9 then parity.  They are 70ns.  BUT - they are Fast
> >> Page mode units, not EDO.
> >
> >There are also non parity 72 pin things that have 2 or 4 chips.
> >
> 
>    True - but my maths on his original post suggested that he had to
> have 8 or 9 chip SIMMs.

But if he buys any new RAM, it's quite likely to have 2 or 4 chips.  They
seem to sell both in equal quantities - I mean, my 8 chip 16Mb modules are
brand new (upgraded from 64Mb of 70ns FPM to 64Mb of EDO - there is a
difference.  I think.) but the other day, I got 2x8Mb for a mate and they
were 4 chips each.

TB