9 Nov
2015
9 Nov
'15
12:37 p.m.
On 11/8/2015 11:50 AM, Josh Dersch wrote:
Hi all -
As noted in a mail last week, I now have my PDP-11/05 running with working
core (8KW). I had some time last night to try loading in some "real"
software, and I started with the PDP-11 paper-tape BASIC, which I've
successfully loaded into memory (in theory). At this point, it became
clear that there's still an issue or two to iron out in the CPU; BASIC
behaves extremely erratically, spewing random error messages, listing
garbage, and corrupting itself and crashing pretty quickly.
I'd run the memory exerciser MAINDECs previously (and I ran them again for
good measure) and there are no obvious issues with the memory. The system
exerciser diagnostic (ZQKB) passes, but the "11 family instruction
exerciser" (ZQKC) fails after a minute or so at PC=016014.
I have the listing for the diagnostic (though I'm not precisely sure
whether it's exactly the same revision) from here:
http://bitsavers.trailing-edge.com/pdf/dec/pdp11/xxdp/diag_listings/MAINDEC…
So, this one would likely be named something like DZQKCC.BIC (or .BIN)
on disk. My guess is that yours is a different file name in the last
two characters before the period.
The paper tape image I found on bitsavers is two revs up from that -
DZQKCE. I didn't take the time to start up a disk image and look at it.
The doc is pretty grainy but the code at 016012
doesn't actually seem to
match what I've got in memory (I disabled relocation in the test just to be
sure things didn't get moved around) and there's no failure check at that
particular point in memory either.
I've tried the paper-tape images from Bitsavers as well as the ones on the
XXDP RL02 images floating around out there and they all yield the same
results; I suppose it's possible the CPU is failing in such a way as to
make the test reporting incorrect but it seems more likely that (a) I have
an outdated listing or (b) I'm misinterpreting the results somehow.
Anyone have any experience with this particular diagnostic?
Thanks,
Josh
The version can normally be identified either by the file name or on the
paper tape if you are using a real paper tape. My guess is that the
version you are running does not match the PDF.
Some of us also have diagnostic listings of various versions, and have
some of them on Microfiche. Unfortunately, I do not seem to have a
listing for DZQKC (any revision). [It isn't missing - it isn't even
listed in the fiche index. :( ]
HOWEVER, I *DO* have a *paper* listing of revision E (among others).
The code starting at 16002 reads
016002 105737 177564 TSTB @#TPS
016006 100375 BPL .-4
016010 006237 177564 TSTB @#TPS
016014 000001 WAIT ; WAIT FOR FIRST INTERRUPT
The routine starts at 015734 and the comment is ";CHECK TTY INTERRUPT"
AND, the paper copy has a red stamp indicating that a change may be
required for it to operation.
LOC FROM TO
2266 200 340
14146 200 340
16164 5227 4737
16166 0 160
160 - 5227
162 - 0
164 - 1375
166 - 207
So, please provide either the complete file name you loaded (if you are
loading from RX, hard disk, DECTape, etc., or the complete information
on the paper tape and we should at least be able to help you figure out
if they match, or not, and whether or not someone has a listing that
matches and can tell you what the error might mean, and perhaps provide
a scan to you (and bitsavers).
JRJ