General DEC diagnostic questions
henk.gooijen at oce.com
Sun Oct 22 03:59:32 CDT 2006
>Van: cctalk-bounces at classiccmp.org namens Jay West
>Verzonden: zo 22-10-2006 01:58
>Aan: General Discussion: On-Topic and Off-Topic Posts
>Onderwerp: General DEC diagnostic questions
>I assume these are probably silly questions, but hey, it's just
>not clear to me :)
>In the PDP11 diagnostic handbook (1988) on bitsavers, some of the
>diagnostics mention setting CSR at 174, and SWR at 176 for various
>options to a given diagnostic. I am assuming that SWR is the console
>switch register. I thought on a /34 this was off in location 777050
>(or something like that). So do I put those options in the keypad
>and hit LSR (which I thought put them in 777050) or do I need to put
>them in 176 before starting the diag?
>Also, is there something special about 174 that I'm not getting?
I am sure others can give way better answers ...
SWR is indeed SWitch Register, which is at 777570 btw.
A value loaded into the SWR can be read by software, here the diag.
It is common that the bits in the SWR have meanings, like halt on error,
loop (for scope use), etc.
The CSR puzzles me a bit, as I thought that stands for Control & Status,
almost always the address of the first register of a controller.
So, I would expect something like e.g. 776174 ... as base address.
CSR is set by jumpers, but I recall the SET CSR in RT11 command vaguely.
I used that with my RH11 MASSbus controller, but that's a few years ago.
>Some of the docs say a particular diagnostic prompts "SWR=000000 NEW="...
>I assume the diags are querying if I even HAVE a switch register,
>and if I do, they don't print that question. Correct?
Not sure, but I guess, yes. The new(er) machines do have a SWR, but
it is not in the hardware, that we love so much :-)
>Thanks for any education :)
Aren't we all learning every time a little bit? I am :-)
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