Re: Tough to Diagnose issue with PDP 11/40 CPU

2016-06-30 Thread william degnan
On Thu, Jun 30, 2016 at 10:21 AM, Noel Chiappa wrote: > > From: William Degnan > > > The problem was a missing KJ11 > > Ah. Well, if you want to add one (I assume you've just re-jumpered the > machine for the moment), I do have one we can copy (for the PC etch) - I'm > assuming here that

Re: Tough to Diagnose issue with PDP 11/40 CPU

2016-06-30 Thread Noel Chiappa
> From: William Degnan > The problem was a missing KJ11 Ah. Well, if you want to add one (I assume you've just re-jumpered the machine for the moment), I do have one we can copy (for the PC etch) - I'm assuming here that originals are now unobtainium. Also, if you have the KE11-E, but no

Re: Tough to Diagnose issue with PDP 11/40 CPU

2016-06-30 Thread william degnan
On Thu, Jun 30, 2016 at 9:58 AM, Noel Chiappa wrote: > > From: William Degnan > > > The IOT step is bombing (?) and loops through the addresses: > > This may be a pointless question, but just to clear the ground first: the > CPU > is otherwise functioning reasonably well? E.g. it's not dr

Re: Tough to Diagnose issue with PDP 11/40 CPU

2016-06-30 Thread Noel Chiappa
> From: William Degnan > The IOT step is bombing (?) and loops through the addresses: This may be a pointless question, but just to clear the ground first: the CPU is otherwise functioning reasonably well? E.g. it's not dropping the 020 bit when reading words from memory? (That would conv

Re: Tough to Diagnose issue with PDP 11/40 CPU

2016-06-30 Thread william degnan
On Jun 30, 2016 1:19 AM, "Fritz Mueller" wrote: > > Hey Bill, > > Do you have a KM11 maintenance card? Guy Sotomayor here sells kits and/or assembled boards at http://www.shiresoft.com/products/km11/KM11%20Replica.html. I built one up myself based on a layout by Tom Uban at http://www.ubanproduc

Re: Tough to Diagnose issue with PDP 11/40 CPU

2016-06-30 Thread Al Kossow
On 6/29/16 5:39 PM, Fritz Mueller wrote: Hey Bill, Do you have a KM11 maintenance card? He posted on vcfed that it was a configured but missing KJ11 board.

Re: Tough to Diagnose issue with PDP 11/40 CPU

2016-06-29 Thread Fritz Mueller
Hey Bill, Do you have a KM11 maintenance card? Guy Sotomayor here sells kits and/or assembled boards at http://www.shiresoft.com/products/km11/KM11%20Replica.html. I built one up myself based on a layout by Tom Uban at http://www.ubanproductions.com/museum.html The easiest way to get to t