On Mon, Feb 13, 2017 at 12:20 PM, Josh Dersch <[email protected]> wrote:
> On 2/13/17 8:16 AM, william degnan wrote: > > Question - I am working on a PDP 11 KE11E M7238 EIS board (for PDP 11/40) >> which causes the CPU to crash when installed; front panel not responsive, >> can't boot XXDP. I installed a removable jumper so I can flip jumper >> configs back and forth between EIS installed/not installed. Without the >> EIS the system works fine, can boot OS's that do not require it like RT11. >> >> As discussed before the EIS is required if I want to boot up UNIX 6 on the >> 11/40, which is a goal of mine. >> >> Thought - I don't have a LW11L, M787 installed. This is a the Line TIme >> Clock option card. Do you think that maybe the EIS board requires this >> for >> some reason, even though there are no references to this as a requirement >> in any docs I can find? Maybe the docs writers assume it's installed? I >> only wonder because any time I have seen the M7238 installed in an 11/40 I >> have also seen a M787. >> >> I could swap out the current 11/40 backplane with a backplane that has the >> jumpers for the M787 already removed, but I only want to do this if it's >> necessary. When we were talking before I neglected to mention I had no >> M787, you may have assumed I did. >> > > I think it's extremely unlikely that the EIS requires an LTC to function, > I can't think of any reason why this would be the case, or why it would > cause the effects you're seeing. I also don't recall seeing any such > requirements in the hardware documentation, but it's been a little while > since I last looked at them (while installing the MMU and Stack Limit > Register in my own 11/40). > > Can you be more detailed in your description of the behavior you're > seeing? Is the system unresponsive at power-up, or is it only after > attempting to boot that it "crashes"? Can you toggle in programs and run > them? > > I'll also add that regardless of what's going on with your EIS, you > *will* need an LTC to run V6 UNIX so you might think about getting one set > up anyway. > > - Josh > > >> thanks for confirming. I will turn my attention to the EIS board and set up a more detailed test/results asap. Bil
