On Thu, May 1, 2008 at 7:55 AM, Jochen Kunz <jkunz at unixag-kl.fh-kl.de> wrote:
But there are a few 4k2 in BA440 boxes. I suppose DEC
switched from
BA213 to BA440 style boxes at the end of the 4k2 live time.
The BA440 has those processor-memory interconnect
slots to
the right of the Qbus, right?
Yes. IIRC this special CPU slot also brings one of
the two DSSI buses
to the backplane.
That's actually a BA430 for the 4000-200 (seach for the
EK?436AB?IN?002 manual on the net), while the BA440 is used for
4000-300 and beyond.
You can put a KA660 in a BA213, but then you need to cable up the DSSI
bus, while the DSSI bus is routed directly to the CPU slot for the
KA660 in the BA430.