Re: A couple of PET drive problems...

From: Bryan Pope (
Date: 2007-03-20 18:26:34

And thusly were the wise words spake by William Levak
> On Mon, 19 Mar 2007, Bryan Pope wrote:
> >
> >
> > 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, but for
> > the 8050 it says it is the Common RAM, $4000 - $43FF.  Could this be
> > the same for the 4040?
> Common RAM $4000-43FF is 2 2114's at UF4 and UF5.

So it is that same two RAM chips is the 8050?

> > 2. With a 2031, it powers up correctly but whenever you try to do any
> > disk access like get a directory or header a disk, the computer hangs
> > until I power off the 2031.  I have already swapped the ROMs and the
> > 6522, but the problem still persists.  I haven't swapped the
> > 75160 and/or 75161 yet.  Could one of these be the problem and if
> > so which one should I swap first?  I am trying to minimize any
> > desoldering/soldering.
> Can you read the error channel when the drive powers up?

No..  I tried doing ?ds$ like Bill D. suggested, but the C= hangs 
like before.

> When you try to read a disk, does the drive motor turn on?  Does the head 
> step?  What do the LED's do?

No drive motor turning on or head stepping.  Also the LEDs stay off.



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