For testing suspect 2114's I simply use the READ/WRITE functions
of the 9010 - Write "AA" to the 1st RAM address, then Read
it back. If you get "AA" then the RAM is apparently good at
that point, but if you get "AX" then you know the low RAM is
bad (D0 - D3) and if you get "XA" then the upper RAM is bad.
Double check with "55" - same results.
Of course if you read the manuals you will find that the RAM test
gives you more information on how to interpret the failure results,
but I find this test very quick.
If you have the Probe, then sync it to Address and you can then
check that the R/W lines are working correctly to see if the RAM is
being addressed at all. The probe is a very handy addition to the 9010
that is often overlooked. It's ability to sync to the Address or Data
makes it indispensable in fast troubleshooting!
John :-#)#
At 10:01 AM -0400 10/23/04, hitech wrote:
Yes he is at
it again!
Going
through a pile of pp2 brds with object memory problems @
4400
Have my
fluke 9010a and my z80-qt pod and polh
Is there a
better way to test the 2114 I am pulling them out and testing in my
mod empuA ttl tester ?
Then have to
socket , They all seam to have the same problem of all lines
high
I am not
that great with the fluke 9010 when it says r/w @4400 is there a way
to narrow it down
Even more
than just object motion memory with the loop or any other method
?
Can anyone
explain how to use the loop ?
Has any one
ever put together a repair log on pp1 or pp2
boards
Any help
would be great
Any info
would be great
Lost and
confused (but having fun)
Ton