2 Aug
2014
2 Aug
'14
8:38 a.m.
Hello All,
Does anyone have an old National Semiconductor memory data book lying around? I have found
the problem with my second 32k memory board - 3 bad DRAM chips. This board is populated
with MM5298N-3B chips. I can't find an online data sheet that talks about the speed
grade (I'm assuming that's what the 3 is referring to). The manual for the board (
http://www.hartetechnologies.com/manuals/Northstar/NorthStar%2032k%20RAM-32… ) says
that the RAM is 200ns access time. I can find a source for MM5298N-4B chips, but I
don't know if the 4B is still fast enough. I'll replace the entire bank of 9
chips at the same time so that they are matched.
Thanks for any assistance.
Ian