Pete Turnbull wrote:
On 30/11/2009 21:03, Ethan Dicks wrote:
Also, what is your board arrangement in the
backplane? You have a
very simple system (CPU, MEM, SLU, termination+boot), but you still
have to preserve the grant chain between the CPU and the BDV-11.
Actually, you don't. If anything else uses the grant chain, you must
preserve the chain between the "anything" and the CPU. However, it
was common to put the BDV11 in the last slot, leaving others empty,
and that's a standard configuration.
I'm somewhat confused by this, I know how and why you need grant cards
in a Unibus machine. But I thought the Qbus made away with that need,
although I have read something about it being needed for certain cards
and that some controllers need to be the last card. Anyway, I have mine
in the order: CPU, MEM, SLU, TERM, with some space between for easier
The backplane is not the serpentine version, when I got it, it had a
RL01 controller in it (I got two RL01 drives too) which I believe need
the straight backplane.
I will check the console cable, it came with the machine but is home
made, it goes directly from the card (i.e. no cab kit). I'm fairly
certain of the baud speed, the manual was quite clear on the jumpering
on the DLVJ1 (I call it that because the pdp-11 field guide lists it as
Thanks Pete and Ethan