Building a PDP-11 for the first time

From: Pete Turnbull <pete_at_dunnington.u-net.com>
Date: Sun Dec 14 18:52:16 2003

On Dec 14, 14:01, Megan wrote:

> In fact, I have taken a KDJ11-B board with an 18Mhz clock,
> removed the clock chip and replaced it with a 20Mhz clock
> and the system ran solidly (I still have it). It also
> correctly identifies, in the boot rom, that the machine has
> a 20Mhz clock...

I've done that too. I also have a dual-height running at 18MHz, but I
know that one gets flaky at anything higher.

> I don't have specific information about an FP bug... I remember
> that some boards couldn't have the FPA installed due to some
> bug but don't have the specifics.

Somewhere in my piles of ol DEC stuff I have a note about which ones
can/can't/already do -- but I'm not sure exactly where it is, nor
whether that's an official original DEC document or a maintenance
company one. As far as I remember, it was described as a bug in one of
the ASICs.

-- 
Pete						Peter Turnbull
						Network Manager
						University of York
Received on Sun Dec 14 2003 - 18:52:16 GMT

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