New finds and some h-11 help - test-drb@ccmp.vtda.org

18 Nov 1999

From: Ethan Dicks &lt;ethan_dicks(a)yahoo.com&gt;

...
 ...
It is wierd - the backplane is upsidedown - the cards go in with the solder
side up.  It threw me for a loop the first time, too.  Fortunately, I didn't
...
 "fix" the problem and power up. 

A shared experience.

...
 BTW, that 4x6 connector is Heathkit propietary.  I have
never seen one
anywhere else except hanging up on the wall of the local electronics
warehouse about 15 years ago back when that kind of connector was more
common.  It's a type of Molex connector. 
I guessed that one too. ;)

...
 If you have _any_ DEC async boards, I'd pull the
H-11-5 and go with a DLV11-J
...
 or the like.  I have an H-11-5.  It's *not* in the
H-11.  It's on the shelf.

How are they different?

...
 I do not have any docs, though, before you ask.  I am
stymied with the H-27
interface card.  I have tested all the TTL ICs, but this thing still locks
up the Qbus when it's plugged into the grant chain with no gaps.  With gaps,
...
 it begins to read the floppy at boot time, but as soon
as the boot code
turns on interrupts, because the interface is in the wrong place, the system
...
 hangs, waiting for the interrupt that never comes.

Will it boot into a monitor without the h-27 attached and is there a command
reference somewhere around?

...

=====
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