booting rt11 v5.1 on an 11/45

[Julian Wolfe]

As I stated in the chat last night, I don't know a whole lot about 11/45s
(or rather, any PDP11s before the /04 in general) but I would recommend
downloading xxdp v2.5 and seeing if that even boots.  This is an easy way to
figure out if (a) it's just RT-11 5.1, and (b) if there are additional diags
on the xxdp 2.5 cartridge that might help nail down the problem.

Downloadable here:
http://www.ibiblio.org/pub/academic/computer-science/history/pdp-11/xxdp/

I hope that helps.
Julian

> -----Original Message-----
> From: cctalk-bounces at classiccmp.org 
> [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Jay West
> Sent: Sunday, March 26, 2006 7:22 PM
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: booting rt11 v5.1 on an 11/45
> 
> The 11/45 will boot xxdp+ v1, but won't boot RT11 v5.1.
> 
> Upon booting the RT11 v5.1 RL02 pack, the disk flashes for 
> about 5-8 seconds, then the processor just halts.
> 
> First question which I didn't see in the RT11 5x docs... what 
> exactly would the hardware requirements be for RT11 5.1 on a 
> 11/45? Is it expecting a minimum of memory? Certain I/O 
> devices at certain locations? I tried both a real DEC RT11 
> v5.1 RL02 dist. pack, and also was able to gen one from a 5.1 
> image on a scratch pack with vtserver.
> 
> The only thing I can think of (and another listmember point 
> to as well) is a problem with interrupts. But I've no idea 
> how exactly to go about troubleshooting it, not being a DEC 
> expert like others here :) I've gone back and forth between 
> using 8K core, 16K core, or 128k unibus memory. 
> Similar results. My copy of xxdp+ seems a bit old, so most 
> diags I have seem to have older names.
> 
> Any thoughts are most appreciated!
> 
> Jay West 
> 
>