26 May
2021
26 May
'21
10:20 p.m.
On Wed, May 26, 2021 at 2:35 PM Zane Healy <healyzh at avanthar.com> wrote:
One question, do I need to worry about the batteries on the H3602-SA panel? I can?t
imagine that this would be causing any issue.
Yes, you do need to worry about the Ni-Cad battery pack on the
H3602-SA panel. Remove it and throw it away. If it hasn't started
leaking and causing corrosion yet it is only a matter of time before
it does. I have removed all of the Ni-Cad battery packs from all of
the VAX systems I have.
An interesting thing about the BA430 backplane is that
in addition to
the M7626 KA660 CPU DSSI bus being present on the 50-pin connector, it
is also present on the C/D connectors, and the BA430 backplane routes
the DSSI bus on slot 1 C/D connectors to the DSSI storage device bays
without the need for a DSSI cable.
I finally found that, in the ?KA660 CPU System Maintenance? manual. What?s interesting
is that there is also a 50-pin header on the KA660, and I?m not yet clear on why. :-)
The M7626 KA660 VAX 4000-200 was available in BA430 and BA215 enclosures.
VAX 4000 Model 200 (BA215) Installation, Order Number EK-432AB-IN-002
https://manx-docs.org/collections/antonio/dec/MDS-2000-01/cd1/VAX/432ABIN2.…
In the BA430 enclosure the KA660 DSSI bus is connected to the DSSI bus
on the backplane through the KA660 C/D connectors, and nothing is
connected to the 50-pin DSSI connector on the front of the KA660
module.
In the BA215 enclosure the DSSI bus is cable based and connects to the
50-pin DSSI connector on the front of the KA660 module.