On 10/21/2020 11:36 AM, Noel Chiappa via cctalk wrote:
> > From: Jay Jaeger
>
> >> 2--M7134 KT24 Memory map
>
> > M7891 UNIBUS Memory (256K, I think, presumably addressed for 0).
>
> If that's all the memory you have, the KT24 isn't really doing anything
> (well, monitoring power;
Appendix D in the 003 rev of the /24 TM has the details of the -YA..
Found it. Board is also now working, and I'm selling one of them on
Ebay. I don't need 4 11/24 CPUs (why do I have these?) Anyway once
things are up I'll swap a KEF11 and a CIS chipset onto the 24 to bring
it to full power
> From: Chris Zach
> The last board is a new style 11/24 and it doesn't do anything but it
> does have three switch packs. So I just need to find the manual for it
Appendix D in the 003 rev of the /24 TM has the details of the -YA..
> In the meantime the UNIBUS problem also
ext project: 11/24. Does it need memory?--Memory sad!
Oh, they're just 4116's then. That's simple, as someone pointed out on
Discord Jameco sells them so I just bought 10 and 10 low profile sockets.
The other alternative was pulling apart one of my MSV11-D boards from
the Q-Bus world but that would be sad... :-)
On 10/26/20 8:31 PM, Chris Zach via cctalk wrote:
Ok, so I'm now troubleshooting the memory parity errors in the MS11-L
memory. And yes, there are bit errors in the memory. I wrote a simple
program to check the first 64k bank and I've found errors in bit 2 but
not everywhere but on a
Ok, so I'm now troubleshooting the memory parity errors in the MS11-L
memory. And yes, there are bit errors in the memory. I wrote a simple
program to check the first 64k bank and I've found errors in bit 2 but
not everywhere but on a predictable pattern of addresses. Interesting,
possible
On Sun, Oct 25, 2020 at 9:01 PM Chris Zach via cctalk
wrote:
>
> Isn't UNIBUS simple! Sorry, Q-Bus doesn't need a terminator, doesn't
> have weird DMA stuff, and if you really need to put a card on a
> particular side you can always grab a DLV11 (everyone has these) and use
> it as a spacer.
On 10/25/20 8:01 PM, Chris Zach via cctalk wrote:
.
Question: Can an RX02 boot an RX01 floppy formatted single density
with the DY: driver? Can it read an RX02 floppy in one drive and an
RX01 floppy in the other or do you have to set the switches and use
the right controller card (that
Ok, so now the three old style 11/24 CPU boards seem to be working. Ish.
The problem with the processor boards turned out to be the switches: On
my original 11/24 board it would work only at 19200. This is because the
switch pack is dirty and the contacts ain't working.
Solution: Spray 95%
And "in the meantime" I figured something was wrong on the Unibus, so I
pulled all of the cards except CPU, memory, and the 9302 terminator.
Still flunks in any memory references in ODT. Weird.
Then I pulled the memory card so it was just the CPU. Same thing.
Then I figured might as well put
Hm. Even odder: When I went back to the original CPU board and changed
the switch settings to that of the working board I got garbage on the
VT100. Checking with a PC and PUTTY I see it *is* now working but at
19200 baud even though I have it set to 9600 baud...
Switch packs may be bad among
Interesting. I went up to the attic and opened the Unibus box. I have 3
extra 11/24 boards, and I have *NO* idea why. Oi. So anyway I started
popping them into the 11/24 chassis to see what happens. Run/halt in
halt, looking for anything.
On the first one (old style) same problem: The CPU
On 10/21/2020 11:36 AM, Noel Chiappa via cctalk wrote:
> > From: Jay Jaeger
>
> >> 2--M7134 KT24 Memory map
>
> > M7891 UNIBUS Memory (256K, I think, presumably addressed for 0).
>
> If that's all the memory you have, the KT24 isn't really doing anything
> (well, monitoring power;
If that's all the memory you have, the KT24 isn't really doing anything
(well, monitoring power; holding boot PROM's; etc). Is your MS11-L configured
to be EUB memory, then? If no KT24 is plugged in, the CPU detects that there
isn't one there, and permanently, statically maps the UNIBUS straight
Hm. In 1986 I was given a pair of pdp8/I's, a third 8/I that was broken,
an RK8, and a bunch of packs from UMBC's psychology lab that were in an
old closet. I could not move out the PDP12 that was in there (would
never fit in my station wagon) but I did take out the FPP12 unit.
Ah those were
> From: Jay Jaeger
>> 2--M7134 KT24 Memory map
> M7891 UNIBUS Memory (256K, I think, presumably addressed for 0).
If that's all the memory you have, the KT24 isn't really doing anything
(well, monitoring power; holding boot PROM's; etc). Is your MS11-L configured
to be EUB memory,
Ethan Dicks via cctalk wrote:
On Tue, Oct 20, 2020 at 10:02 PM Jay Jaeger via cctalk
wrote:
I have had my system since February, 1988 when a friend and I hauled the
11/24, two RK07's a VT100 and and TU10 out of U Wisconsin Bascom Hall
for about $600.
Nice. I didn't end up working for
On Tue, Oct 20, 2020 at 10:02 PM Jay Jaeger via cctalk
wrote:
> I have had my system since February, 1988 when a friend and I hauled the
> 11/24, two RK07's a VT100 and and TU10 out of U Wisconsin Bascom Hall
> for about $600.
Nice. I didn't end up working for UW-Madison until 2003. I never
On 10/18/2020 10:59 PM, Chris Zach via cctalk wrote:
> Weird. Set all the switches for the 11/24 CPU and Unibus map, and still
> nothing coming out of the serial port. Figured I would document the
> settings and see if anyone with an 11/24 can cross-check my settings.
>
> Serial: Because my VT52
> From: Chris Zach
> Unibus can get annoyed at a lot of things .. Q-Bus is much simpler
Not sure I'd concur with that latter. In analog terms the UNIBUS and QBUS are
almost identical (which is why the same driver chips such as 8641's are used
with both), and at the digital level they
Indeed. I had it running 30 years ago, it was my RX01 floppy pdp11.
Unfortunately I think I removed, gave away, or something-ed one of the
Plessy core memory boards. Which means I can't just boot it and continue
where I left off (I seem to recall it ran Dungeon off RX01's).
The 11/05 has
On 10/19/20 8:20 PM, Chris Zach via cctalk wrote:
On 10/19/2020 6:10 PM, Noel Chiappa via cctalk wrote:
> Time to stop trying random things and drop the (metaphorical) Big
> Hammer.
Well, yeah. Although my methods are *not* random, what I have been doing
is trying to set the 11/24 and it's
On Mon, 2020-10-19 at 20:20 -0400, Chris Zach via cctalk wrote:
>
> won't work. Maybe I'll just drag out the 11/05 and get that working
> first, it's got a nice front panel that doesn't lock up often :-)
>
>
The 11/05 was the first 11 that I repaired and got working. You should
note that the
On 10/19/2020 6:10 PM, Noel Chiappa via cctalk wrote:
> Time to stop trying random things and drop the (metaphorical) Big
> Hammer.
Well, yeah. Although my methods are *not* random, what I have been doing
is trying to set the 11/24 and it's peripherals to a known working base
state. Unibus can
> From: Chris Zach
> still nothing coming out of the serial port. Figured I would document
> the settings and see if anyone with an 11/24 can cross-check my settings.
Time to stop trying random things and drop the (metaphorical) Big Hammer.
Look at the bus, and see if it's trying to
Weird. Set all the switches for the 11/24 CPU and Unibus map, and still
nothing coming out of the serial port. Figured I would document the
settings and see if anyone with an 11/24 can cross-check my settings.
Serial: Because my VT52 has a male RS232 end (factory) and the 11/24 has
a male
> From: Ethan Dicks
> ODT works from my 11/34 with bad RAM,
?? The -11/34 doesn't have 'real' ODT (like the one in the LSI-11's,
KDF11's, KDJ11's), which is in microcode).
The M9301 and M9312 bootstrap ROM boars contain a console emulator, but it's
in macrocode.
Noel
> From: Chris Zach
> Next up is the 11/24, this is one of the 5.25 inch rack mounts with a
> CPU, KT24, and no memory.
> First question: Will ODT respond at all with no memory on the Unibus?
My _guess_ is probably, since on other KDF11 CPU's, ODT works with no
memory, but I
On Thu, Oct 15, 2020 at 10:52 PM Chris Zach via cctalk
wrote:
> Next up is the 11/24,
> this is one of the 5.25 inch rack mounts with a CPU, KT24, and no memory.
>
> First question: Will ODT respond at all with no memory on the Unibus?
I don't recall. I think so but it's possible it won't. ODT
Ok, with the PDT and the RX02's out of the way I'm running down to the
wire on fixing stuff before I tackle the 8/L's. Next up is the 11/24,
this is one of the 5.25 inch rack mounts with a CPU, KT24, and no memory.
First question: Will ODT respond at all with no memory on the Unibus?
Second
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