S100 RAM replacements

[Richard A. Cini]

All:

	Through Randy, I actually found these at JDR Microdevices, so I
ordered a few, which I should have this week. Thanks a lot.

Rich

-----Original Message-----
From: cctalk-bounces at classiccmp.org
[mailto:cctalk-bounces at classiccmp.org] On Behalf Of Joe R.
Sent: Saturday, July 16, 2005 9:42 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: S100 RAM replacements


Rich,

   Do you  have a date for these? I don't have all my data books here
but I checked in my 1980 and 1981 D.A.T.A. books and they don't list the
MM2147 but they do list a TI version (TMS21L47). Those are 4k x 1 RAMs 5
volt only RAMs. Your parts are probably the same. BTW MM is Monolithic
Memories.  I think I have some 2147s in my spares. How many are you
looking for?

   I don't have any listing for 5257s in these books so I can't tell you
anything about them.

   Joe


At 12:18 AM 7/16/05 -0400, you wrote:
>All:
>
>	I decided to run a memory test on some boards I have and I found
a bad 
>chip. It's on a CompuPro RAM14 and the chip is a MM2147J. None of my 
>other 16k boards has this chip (VG boards; contain 2114s but the boards

>have "BAD" labels on them so I've never plugged them in). The chip does

>not have a speed marking that I can see and I don't have a copy of the 
>RAM14 manual although it might be similar to the Godbout EconoRam IV 
>which uses the 40144/mm5257 chips.
>
>	Can anyone help me with a suitable cross for this chip...and a
source? 
>My usual haunts don't show stock on this number.
>
>	Thanks.
>
>Rich
>
>Rich Cini
>Collector of classic computers
>Build Master for the Altair32 Emulation Project
>Web site: http://highgate.comm.sfu.ca/~rcini/classiccmp/
>/************************************************************/
>
>
>