🚀 go-pugleaf

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.