#Memory HELP!
3 messages in this thread
Dean, I had a couple more questions to ask you before I change the chip.
First, since I have to go out and buy a 41256, does it have to be the same
speed (150) as the rest, or can I buy 120 or 100? Second, as I told you, I used
two Mem test programs-MEMTEST and MTEST-2 to determine the address at fault.
MEMTEST uses (I believe) a test called the sum test, which gave the error at
2019A2. MTEST-2 uses (I believe) a values test, and gave the error at 2019A3.
When I went in with the editor 2019A2 seemed fine but 2019A3 was the problem.
How could these two programs report an error at two different addresses, and,
does that really matter?
I'll let you know how it goes after I change it, -Jay
MEMTEST may access memory 16 bits at a time and not differentiate between
errors in the upper and lower byte. Hence the even address.
Jon
Jay,
The speed of the chip doesn't matter, as long as you are replacing with
the same or faster speed chip.
The probable reason for the discrepency is that MEMTEST tests word values
(even addresses, two bytes at a time) while MTEST-2 tests bytes. If this is the
case, then the two tests actually reported the same error.
-Dean