[GreenKeys] just bagged a heath TU off eplace good to go with H89 in disp...

[Christian Gauger-Cosgrove]

Umm no...

The M8192 version of the 11/73 -- that is the *DUAL WIDE* version --
will work in an 18-bit backplane, if I remember correctly. It's the
M8190 -- the *QUAD WIDE* version -- that absolutely requires the C/D
interconnect for PMI memory.

Of course, the M8190 is also the module number of the 11/83 and 11/93.
So some M8190s are more expensive then others. It's all dependent on
the appended letters to the M8190 module.


You really need to look at either the DEC Edited Option Module List or
one of the handy PDP-11 Field Guide files to see what the suffixed
letters mean. Since there's quite a price difference between a board
that is incapable of getting an FPU and one with an FPU and CIS
options.


Of course, there's also the memory modules one needs to know about. A
quad-wide PMI memory will *NOT* work in an 18-bit serpentine
backplane. A quad-wide or dual-wide QBUS memory will however -- if it
supports 18b addressing. (Some of the small memories are only 16b
addressing capable.)


The BA23 box -- which I think looks a bit ugly, I like the BA123 box
more, or the BA11 style box -- has a few Q22/CD slots at the top of
the backplane, and the rest is all Q22/Q22 serpentine. You'd put the
PMI memories *BEFORE* the CPU, and then the devices on the QBUS after
the CPU.



More important information about the PDP-11's peripherals -- always,
always *ALWAYS* put an RQDX1 or RQDX2 controller as the very last
device on the bus; since they break the grant continuity chain. The
RQDX3 and RQDX4 are fine though.

A good controller to acquire is an MSCP SCSI controller like the
CQD-220; because you can still "easily" acquire fifty-pin SCSI disks,
which are nice and small, and "reliable enough". Plus te SCSI disks
are nice and bit, and you could put things like BSD or RSX, or RSTS on
them.



Any way, I'm rambling.
Cheers!




On 5 November 2012 13:20, Adrian Stoness <tdk.knight at gmail.com> wrote:
> u need a ba23 backplane for the 11/73
> h11 is not a ba23
>
> On Mon, Nov 5, 2012 at 12:15 PM, Christian Gauger-Cosgrove
> <captainkirk359 at gmail.com> wrote:
>>
>> Ah, will the 11/73 work in the H-11?
>>
>> The answer is "Maybe." It depends on whether the H11 does anything
>> "funky" with the -- at the time of the LSI-11/03 -- unused bus lines
>> that the 11/23 and 11/73 (and later 22-bit '11 CPUs) used for the
>> higher order address bits.
>>
>> It shouldn't since the H11 uses the actual straight from DEC LSI-11 CPU
>> board.
>>
>>
>> You will probably also want to invest in an MSV11-L RAM; or if you
>> feel very bored, wirewrap the backplane to 22-bit and invest in a 512K
>> or 1MB RAM board.
>>
>>
>> Otherwise, it should be fine.
>>
>>
>> Cheers,
>> Christian
>>
>> On 5 November 2012 13:04,  <COURYHOUSE at aol.com> wrote:
>> > I will have to make a list  ...    due to it's prior owner I would
>> > suspect
>> > it is as loaded as can be.  I have the floppy drives but the   disks
>> > are
>> > roached ... I need to  find  some live media or a way to load and save
>> > some....tell me more....... oddly enough I wonder if the  ACE  video
>> > editor
>> > carcus  that has an  11/73  board in it would fly in this  H-11 unit!?
>> >
>> >
>> > In a message dated 11/5/2012 8:48:43 A.M. Alaskan Standard Time,
>> > captainkirk359 at gmail.com writes:
>> >
>> > Hello Ed:
>> >
>> > What kind of boards are in the H11 by any chance?
>> >
>> >
>> > And have you considered trying to get the H11 up and running RT-11 by
>> > any chance? (All you need is a PC with a serial port and a second
>> > serial port on the H11. And patience. BUT NEVERMIND THAT!)
>> >
>> >
>> > Also, you considered trying to upgrade the H11's CPU from the godawful
>> > LSI-11 to a PDP-11/23 CPU instead?
>> >
>> >
>> > Cheers,
>> > Christian
>> ______________________________________________________________
>> GreenKeys mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:GreenKeys at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>
>