Re: Stuck bits on 11/73 Clearpoint 4MB memory - how to repair?

2016-02-15 Thread Noel Chiappa
> From: Jacob Ritorto > I struggled for hours with inadequate eyesight, tools and materials, > but I think I got this mod done! That was quick! I had an 11/23 on my workbench that had had that backplane mod, so I took it apart to take a picture, to help you, but I guess that's OBE...

Stuck bits on 11/73 Clearpoint 4MB memory - how to repair?

2016-02-13 Thread Jacob Ritorto
Hi, Seems I have bits 4 and 3 sticking on my Clearpoint QRAM-2-SAB-1 88b 4MB memory in my pdp11/73. Can anyone offer hints as to how to identify which component is broken and how to go about repairing this? It's the only memory board in this machine, so I guess the problem might

Re: Stuck bits on 11/73 Clearpoint 4MB memory - how to repair?

2016-02-13 Thread Jay Jaeger
On 2/12/2016 5:32 PM, Jacob Ritorto wrote: > Hi, > Seems I have bits 4 and 3 sticking on my Clearpoint QRAM-2-SAB-1 88b > 4MB memory in my pdp11/73. > > Can anyone offer hints as to how to identify which component is broken > and how to go about repairing this? > > It's the only

Re: Stuck bits on 11/73 Clearpoint 4MB memory - how to repair?

2016-02-13 Thread John Robertson
On 02/12/2016 6:55 PM, Jay Jaeger wrote: On 2/12/2016 5:32 PM, Jacob Ritorto wrote: Hi, Seems I have bits 4 and 3 sticking on my Clearpoint QRAM-2-SAB-1 88b 4MB memory in my pdp11/73. Can anyone offer hints as to how to identify which component is broken and how to go about repairing