PDP 11/73 SLU

From: Pete Turnbull <pete_at_dunnington.u-net.com>
Date: Wed Oct 1 15:33:07 2003

On Oct 1, 11:43, Brian Hechinger wrote:
> On Wed, Oct 01, 2003 at 10:16:13AM -0600, Kevin Handy wrote:
> >
> > The CPU card should be almost identical to an 11/83 system.
> > Main difference is the speed of the clock, iirc.
> uhm, i thought a /73 was a dual width card and didn't have any serial
> anything on it. am i confused?

Yes and no. There is a dual-height version of the 11/73 (KDJ11-A)
which carries the processor, MMU, FPA, cache control, etc, but no
bootstrap, SLUs, or line-tme clock. It was commonly sold as an OEM
product or as an upgrade to 11/23 systems. There is also quad-height
version (KDJ11-B), the same board as as the 11/83, but (if sold as an
11/73) it has a 15MHz crystal instead of 18MHz, and would originally
have had different bootstrap ROMs.

Pete						Peter Turnbull
						Network Manager
						University of York
Received on Wed Oct 01 2003 - 15:33:07 BST

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