Re: A couple of PET drive problems...

From: William Levak (wlevak_at_sdf.lonestar.org)
Date: 2007-03-20 05:33:52

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 zimmers.net, 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.

> 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?

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

wlevak@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org

       Message was sent through the cbm-hackers mailing list

Archive generated by hypermail pre-2.1.8.