PDP-11/45 RSTS/E boot problem

Henk Gooijen henk.gooijen at hotmail.com
Mon Dec 31 17:32:37 CST 2018


One thought crossed my mind, probably not an issue, but you never know.

You mentioned that you have an RK11-C, *not* RK11-D.

There are one or two bits in a register of the RK11 that have a different meaning/function, depending on the controller being a -C or -D. The RK11-C was quickly replaced by the RK11-D, but I guess RSTS would know the difference. Other guys here will be able to give a lot better light on this than me (Paul?)

A Healthy 2019!

Henk, PD8PDP

Van: cctalk <cctalk-bounces at classiccmp.org> namens Fritz Mueller via cctalk <cctalk at classiccmp.org>
Verzonden: Monday, December 31, 2018 11:47:23 PM
Aan: General Discussion: On-Topic and Off-Topic Posts
Onderwerp: Re: PDP-11/45 RSTS/E boot problem

> On Dec 31, 2018, at 1:54 PM, Paul Koning <paulkoning at comcast.net> wrote:
> The standard idle pattern is in the data lights.  I don't remember if the "fancy" pattern appeared in V7.0 or earlier, but in any case it's an undocumented SYSGEN option.
> In RSTS/E, the display register shows the system error count.  That's from I/O errors reported by the various drivers.
> Do you have a second disk pack?  If so, you could use the DSKINT option in INIT to initialize a pack, with pattern tests.  That would show what the RSTS disk driver thinks of your RK05.
> Something else you might try: when you start the system, don't enter line-feed for the quick start, but the START command.  That is a more verbose version which will display some additional messages.  If anything is getting disabled, it would show there.

Thanks, Paul — that’s a bunch of helpful info!

I have done some long-form starts, but no complaints are printed to the console.

I do have an additional as-yet-untried pack that I got in a recent eBay option.  I’ll give it an inspection and if its good to go I’ll give the pattern DSKINT a try.  I only have one RK05 drive working at the moment, but I suppose I can swap after issuing “DS” to the “Option:” prompt?

I’m also gearing up to throw the logic analyzer on the RK11 and see what sector(s) it is trying to read and what error/interrupt signaling may actually be happening.

Last, any more info on that fancy light sysgen option, for future reference in case I ever get on to a later version?


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