27 Sep
2015
27 Sep
'15
12:54 p.m.
Hello!
I have started to work slowly with the PDP-11/05 I received a year ago. It
is the big BA11-D chassis type machine. The power supply is now fixed and
working fine. A few smaller capacitors were leaking. But also one of the
big input filtering capacitors was bad and had to be replaced.
The front panel have been cleaned and checked. The next step is to start
looking into the the CPU itself. Unfortunately one of the CPU boards are
marked "faulty" so there are certainly work to be done.
The plan is to get it to work with the 8kW core memory, M7800 connected to
a good old teletype and PC05 paper-tape reader / punch and then run paper
tape BASIC on it or other paper tape software.
The problem is that I am lacking in the M7810 board. Since I do have a M105
and M7821 a M781 could do as well.
Does anyone has a M7810 or M781 to sell?
http://www.datormuseum.se/computers/digital-equipment-corporation/pdp-11-05
BTW. Does anyone have a BA11-D chassis and could help me take a photo of
the top and bottom covers? Those are missing on my machine and it seems
impossible find a drawing for the BA11-D chassis itself. It is not in the
PDP-11/05 Engineering Drawings which I already have.
And if someone also have a G231 I would be interested because that would
mean that the machine can be fully configured with 16 kWords!
/Mattis
27 Sep
27 Sep
12:56 p.m.
The plan is to get it to work with the 8kW core memory, M7800 connected to
a good old teletype and PC05 paper-tape reader / punch and then run paper
tape BASIC on it or other paper tape software.
The problem is that I am lacking in the M7810 board.
Since I do have a M105
and M7821 a M781 could do as well.
Why do you need a second serial port? The PDP11/05 CPU board set has a built-in
UART set to the console port address. In general it was set to be 110 baud, and
has a current loop interface, but that's just what you need for a teletype.
-tony
1:25 p.m.
s?ndag 27 september 2015 skrev tony duell <ard at p850ug1.demon.co.uk>:
You're right of course. Unlike the others I've worked with (11/04, 11/34,
11/03 and 11/23) this one include a serial port. Hasn't worked with CPU
boards yet so I forgot the built-in serial port.
BTW. I do have omnibus, unibus and qbus stuff to trade with if there is
interest.
/Mattis
The plan is to get it to work with the 8kW core memory, M7800 connected
to
a good old teletype and PC05 paper-tape reader /
punch and then run paper
tape BASIC on it or other paper tape software.
The problem is that I am lacking in the M7810
board. Since I do have a
M105
and M7821 a M781 could do as well.
Why do you need a second serial port? The PDP11/05 CPU board set has a
built-in
UART set to the console port address. In general it was set to be 110
baud, and
has a current loop interface, but that's just what you need for a teletype -tony
1:37 p.m.
On 9/27/2015 2:56 PM, tony duell wrote:
Curious: what if the built in one were
faulty, or if you wanted to use rs-232
instead of current loop?
- John
The plan is to
get it to work with the 8kW core memory, M7800 connected to
a good old teletype and PC05 paper-tape reader / punch and then run paper
tape BASIC on it or other paper tape software.
The problem is that I am lacking in the M7810
board. Since I do have a M105
and M7821 a M781 could do as well.
Why do you need a second serial port? The
PDP11/05 CPU board set has a built-in
UART set to the console port address. In general it was set to be 110 baud, and
has a current loop interface, but that's just what you need for a teletype.
-tony
1:47 p.m.
[Second serial port on a PDP11/05]
Curious: what if the built in one were
faulty, or if you wanted to use rs-232
instead of current loop?
IIRC the 11/05S has a way to disable the built-in
console port (fit a wire link on one of the boards?)
the original 11/05 doesn't. There must be a way to do
it by cutting/jumpering but it is a mess....
Therefore, if the built-in port is faulty it is going to be
a lot less work to fix it than to disable it and add a DL11
Heck, the entire 11/05 CPU is only a couple of hundred ICs,
the serial port is going to be a small fraction of those. It is
not going to be hard to figure out.
As for the physical interface, firstly the OP mentioned a
teletype, which to me suggests current loop anyway. If
you need RS232 then either pick up TTL level signals on
the CPU board and add level shifters (very easy, but
makes the machine not original) or make a current loop
to RS232 interface (not exactly difficult either). I think
both are less work than disabling the built-in port.
-tony
- John
5:07 p.m.
I have been through the ground up restoration of a full chassis version,
make sure the CPU is functioning correctly first. The best place to start:
http://www.psych.usyd.edu.au/pdp-11/hints.html
Try toggling in the "Line Time Clock Interrupt Test" from 001000, returned
the expected value of 000104.
Here is a pdf of the cabling for tty console, if you have no current loop
device an rs232 converter will work.
http://vintagecomputer.net/teletype/asr33/M9970_TTY.pdf
See also
http://www.pdp-11.nl/pdp11-05/cpu/boards/m7260.html
echo characters toggle-in program
005000 CLR R0
105737 TSTB @#177560
177560
100375 BPL -3
105737 TSTB @#177564
177564
100375 BPL -3
113737 MOVB @#177562,@#177566
177562
177566
105737 TSTB @#177564
177564
100375 BPL -3
110037 MOVB R0,@#177566
177566
105737 TSTB @#177564
177564
100375 BPL -3
000756 BR -16
On Sun, Sep 27, 2015 at 4:47 PM, tony duell <ard at p850ug1.demon.co.uk> wrote:
[Second serial port on a PDP11/05]
--
Bill
vintagecomputer.net
Curious: what if the built in one were
faulty, or if you wanted to use rs-232
instead of current loop?
IIRC the 11/05S has a way to disable the built-in
console port (fit a wire link on one of the boards?)
the original 11/05 doesn't. There must be a way to do
it by cutting/jumpering but it is a mess....
Therefore, if the built-in port is faulty it is going to be
a lot less work to fix it than to disable it and add a DL11
Heck, the entire 11/05 CPU is only a couple of hundred ICs,
the serial port is going to be a small fraction of those. It is
not going to be hard to figure out.
As for the physical interface, firstly the OP mentioned a
teletype, which to me suggests current loop anyway. If
you need RS232 then either pick up TTL level signals on
the CPU board and add level shifters (very easy, but
makes the machine not original) or make a current loop
to RS232 interface (not exactly difficult either). I think
both are less work than disabling the built-in port.
-tony
- John
9:39 p.m.
On 9/27/2015 2:54 PM, Mattis Lind wrote:
Hello!
I have started to work slowly with the PDP-11/05 I received a year ago. It
is the big BA11-D chassis type machine. The power supply is now fixed and
working fine. A few smaller capacitors were leaking. But also one of the
big input filtering capacitors was bad and had to be replaced.
The front panel have been cleaned and checked. The next step is to start
looking into the the CPU itself. Unfortunately one of the CPU boards are
marked "faulty" so there are certainly work to be done.
The plan is to get it to work with the 8kW core memory, M7800 connected to
a good old teletype and PC05 paper-tape reader / punch and then run paper
tape BASIC on it or other paper tape software.
The problem is that I am lacking in the M7810 board. Since I do have a M105
and M7821 a M781 could do as well.
Does anyone has a M7810 or M781 to sell?
My inventory says I have one (it is the interface to a paper tape unit,
of course). If I have at least 2 more in other machines, then I could
part with one - and I expect that I have at least 3 or 4 in machines.
The one I have in inventory is untested. I will check on that tomorrow,
and get back to you on that situation directly.
Note that DEC had two paper tape units had different interfaces,
depending upon what they were used with. For the PC11 card to interface
to it, it needs to be a PC11 or a PC05 with the right cards in it.
http://www.datormuseum.se/computers/digital-equipment-corporation/pdp-11-05
BTW. Does anyone have a BA11-D chassis and could help me take a photo of
the top and bottom covers? Those are missing on my machine and it seems
impossible find a drawing for the BA11-D chassis itself. It is not in the
PDP-11/05 Engineering Drawings which I already have.
And if someone also have a G231 I would be interested because that would
mean that the machine can be fully configured with 16 kWords!
I have several of those. Most of those are also untested, but one has
been tested.
/Mattis
In one of your other notes you mention Omnibus stuff. I would love to
have an Omnibus paper tape interface, RK05 interface and/or RX01 interface.
JRJ
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6 comments
5 participants
participants (5)
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ard＠p850ug1.demon.co.uk -
billdegnan＠gmail.com -
cube1＠charter.net -
js＠cimmeri.com -
mattislind＠gmail.com