From: Ethan Dicks (ethan.dicks_at_gmail.com)
Date: 2007-03-20 05:48:17
On 3/19/07, William Levak <wlevak@sdf.lonestar.org> wrote:
> On Mon, 19 Mar 2007, Bryan Pope wrote:
> > 1. I have a 4040 that when powered up the LEDs blink nine times...
>
> Common RAM $4000-43FF is 2 2114's at UF4 and UF5.
For those that don't already know, the 2114 is a part that's quite
famous for failing, moreso than any other RAM chip I can think of.
It's probably worth pulling both of them and replacing them with
high-quality machined-pin sockets to facilitate chip replacement down
the road. Yes, sockets are less reliable than solder joints, but the
long-term risk is damage to the mainboard, and I think it's a greater
risk than sockets. I would _not_ use cheap sockets vs solder.
You could also, potentially, build a piggyback board to use a 6116 2K
SRAM in place of these 1Kx4 parts, but that would be mechanically more
difficult than locating a pair of 2114s (which should still be
available from places like B.G. Micro for a buck or two each... yep...
http://www.bgmicro.com/index.asp?PageAction=VIEWPROD&ProdID=10842
$2.19 each).
-ethan
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