From: William Levak (wlevak_at_sdf.lonestar.org)
Date: 2007-04-10 06:33:35
On Mon, 9 Apr 2007, Bryan Pope wrote:
>
> What has gone one with these two issues:
>
>>
>>> 1. I have a 4040 that when powered up the LEDs blink nine times. I
>>> can't find a flash code table for the 4040 at zimmers.net, but for
>>> the 8050 it says it is the Common RAM, $4000 - $43FF. Could this be
>>> the same for the 4040?
>>
>
> This was the RAM chips at UF5 and UF4. After replacing both in
> each of my 4040s, they powered up proprely. I noticed on one of the
> 4040s that a couple of the RAM chips was replaced previously, but there
> was one in the UC column and one in the UD column. What kind of test
> could they have done to figure out which RAM chip was bad while the
> chips were still soldered on?
As long as the computer can communicate with the drive, and low memory is
good, so that the drive's operating system can function, then it is fairly
simple to load a memory test routine into low memory on the drive and have
it have it place the address of failed RAM at a predetermined location, so
that it cam be read from the computer.
There was a drive test routine that came on one of the early drive demo
disks that did this and a number of other tests.
wlevak@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org
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