Help Identifying RAM Chips

From: jpero_at_cgo.wave.ca <(jpero_at_cgo.wave.ca)>
Date: Sun Nov 2 18:26:21 1997

> I disagree with both of you. 300ns is more like the 70's to me. Even the
> 1982 IBM PC XT had 200ns RAM. A year later adding a third to that figure
> makes no since. But 300ns might be right; as I would KILL for 30ns RAM in
> a Pentium 233!!!! Even the fastest EDO RAM (Slightly outdated, but still
> recent) is at 50ns; so 30ns makes ZERO sense.
>
Correct, the number 1 is 64k and I bet that is for video use i think
because: I have old machines like this designs usually uses big 24
dip static memory or dynamic 64k in 4 bits form maybe. 300 Could be
static memory more likely than dynamic type which might be 8k x
8bit in a 24 or 26 pin fat package and mostly likely found in video
section. Oh yeah, I'm very sure that was normal configuration for
that CGA video type for that time in 1983's, that should have 2 of
them to make 16k.

Other last 3 chips, they're all 256k x 1bit at 150ns. Note! Change
all 9 chips in a bank to keep reliablity which you might have
experienced having problems suppose if you had just did one chip...
150ns could be 8mhz because 4.77mhz takes exactly 210ns per
instruction in 8088 so IBM used 200ns chips.

Oh, Tim, I would be surprised if military accidently released 15ns in
early 1980's Oh no! :) NOT! The fastest current drams of any kind
was 45ns and mostly used in video cards for no reason where 60ns
would do well...static chips did not hit 30ns mark for nearly 7 years
later, I think.

Troll the hardware guy.

> ----------
> From: Tim Shoppa <shoppa_at_alph02.triumf.ca>
> To: Discussion re-collecting of classic computers
> <classiccmp_at_u.washington.edu>
> Subject: Re: Help Identifying RAM Chips
> Date: Monday, November 03, 1997 5:35 AM
>
> > Your chip #1 is a 64k chip speed of 30ns, chips 2&3 are 256k at 150ns
> speed.
> ^^^^^^^^^^^^^^^^^^^^^^

Big nip to save bandwidth...

Yes right, Tim.
 
Received on Sun Nov 02 1997 - 18:26:21 GMT