19 Oct
2020
19 Oct
'20
3:10 p.m.
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 talk to the console (i.e. ODT is
running).
Alas, I looked at the -11/24 Tech Manual - latest rev here:
http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/dload/EK-11024-TM-003.pdf
and it sez (pg. 4-25):
"Internal addresses; i.e. serial line unit registers .. There is no external
bus cycle performed for an internal address."
So you can't look on the UNIBUS. At least we have a set of prints for it:
http://bitsavers.org/pdf/dec/pdp11/1124/MP01018_1124schem_Aug80.pdf
CPU prints start on pg. 145; the TM will tell you what signals to look for.
Noel
19 Oct
19 Oct
5:20 p.m.
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 get annoyed at a lot of things (lack of termination, 4
kinds of Unibus (well 5 if you consider the 11/45), and a whole lot of
general weirdness.
Q-Bus is much simpler, although there is 18 and 22 bit and the weird CD
interconnect to watch out for, you don't need a terminator and with very
few exceptions (RKV11, RL01 dual controller, very early memory that
wanted external refresh) things pretty much work bus-wise.
"Internal addresses; i.e. serial line unit
registers .. There is no
external bus cycle performed for an internal address."
Yeah, the serial ports I think are emulated-ish on the main board. If I
could disable them I could do a normal DL11 and see what I see, but that
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 :-)
But if someone has an 11/24 and can cross-check my switch settings to
see if I missed something I would appreciate.
CZ
5:25 p.m.
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 11/05's front panel is driven by the uCode of the CPU.
It's connection to the CPU is through a "serial" protocol (it's been
too long...I think it's just a big shift register) to keep the pin
count (e.g. cost) low.
TTFN - Guy
7:47 p.m.
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 memory boards as follows:
M930/H214 (begin terminator, core plane)
G110
G231
G231
G110
Unibus jumper/H214 (end of line)
It does not have the KW11 line time clock or the weird serial port that
could be run off the CPU. Instead a normal boring DL11.
So 2 MM11-L's for 16kw of memory. Why do I have an extra H216 core board
lying around. Anyone got an extra 4k of memory lying around?
Hm. I guess I could put my DA11-F Unibus window in there and jumper it
so that a 4k window of memory on the 11/24 appears on the 11/05. That
could work, unless someone has a spare 4/8kw of core they don't need.
The Plessy board is stuck in there tight with no easy way to remove. It
says its an 8k*16 PM1105. Crap, it might be jumpered for the last 8k.
But that does mean I swapped a core board. You know I might have traded
it to MG in return for a pair of Sun386i's for CrystelCom's mail and DNS
servers. Maybe if he still has it I can trade it for this 216 core plane
if he just wants one on his wall.
CZ
On 10/19/2020 8:25 PM, Guy Sotomayor wrote:
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 11/05's front panel is driven by the uCode of the CPU.
It's connection to the CPU is through a "serial" protocol (it's been
too long...I think it's just a big shift register) to keep the pin
count (e.g. cost) low.
TTFN - Guy
6:09 p.m.
On 10/19/20 8:20 PM, Chris Zach via cctalk wrote:
On 10/19/2020 6:10 PM, Noel Chiappa via cctalk wrote:
Wish I still had my 11/24. It was my first and I always liked it.
bill
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 get annoyed at a lot of things (lack of termination, 4
kinds of Unibus (well 5 if you consider the 11/45), and a whole lot of
general weirdness.
Q-Bus is much simpler, although there is 18 and 22 bit and the weird CD
interconnect to watch out for, you don't need a terminator and with very
few exceptions (RKV11, RL01 dual controller, very early memory that
wanted external refresh) things pretty much work bus-wise.
"Internal addresses; i.e. serial line unit
registers .. There is no
external bus cycle performed for an internal address."
Yeah, the serial ports I think are emulated-ish on the main board. If I
could disable them I could do a normal DL11 and see what I see, but that
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 :-)
But if someone has an 11/24 and can cross-check my switch settings to
see if I missed something I would appreciate.
1294
days inactive
1295
days old
4 comments
4 participants
participants (4)
-
bill.gunshannon＠hotmail.com -
cz＠alembic.crystel.com -
ggs＠shiresoft.com -
jnc＠mercury.lcs.mit.edu