16 Jul
2005
16 Jul
'05
1:41 p.m.
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/
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