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

Mon Nov 5 14:38:22 EST 2012

this is all great info  many thanks !!!  feel free to ramble  anytime !!  
----Ed

In a message dated 11/5/2012 10:21:17 A.M. Alaskan Standard Time,  
captainkirk359 at gmail.com writes:

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
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