If you are running a BA11-M box (3 1/2 inches tall), make sure the 2 fans
are running up to speed. They slow as the fans go bad and can cause all
kinds of H780 power supply and logic problems. When you shut the box the
fans should spin for a few seconds. If they stop within a second, change it.
On 5/9/19 9:57 AM, Mister PDP via cctalk wrote:
> I was wondering if any in depth
> troubleshooting material existed
I'd start with the description in WD1600 chip set docs to see if
the basic microprocesor is running
> From: Mister PDP
> the 'Run' light does not come on when the switch is toggled
Yeah, it wouldn't come on full unless it somehow fell into a loop of some
kind - very unlikely. (Does that model LSI-11 have the on-board memory? I'm
too lazy to look it up! :-) And what do you have the CPU
I was referring to both the ODT prompt and the run light. I get nothing on
the console and the “Run” light does not come on when the switch is toggled.
On Thu, May 9, 2019 at 12:41 PM Noel Chiappa via cctalk <
cctalk@classiccmp.org> wrote:
> > From: Mister PDP
>
> > I was wondering if
> From: Mister PDP
> I was wondering if any in depth troubleshooting material existed online
I am not aware of any; I would be glad to be corrected. Unlike the early
gneration of UNIBUS CPU's, these generally weren't intended for internal
fault analysis and repair - module swapping and
On 05/09/2019 11:57 AM, Mister PDP via cctalk wrote:
Hello,
As part of my H11A project, I am trying to debug my M7264-CB LSI-11 CPU
module. When powered on, the CPU does not respond to the Run/Halt switch
either on the front panel or via the console. I found engineering
schematics for the M7264
