DEC H7260 PSU fault

Ethan Dicks ethan.dicks at
Sat Jan 27 16:39:12 CST 2018

On Sat, Jan 27, 2018 at 5:13 PM, Glen Slick <glen.slick at> wrote:
>> Just be sure to follow the grant chain - the BA23 and BA123 have a
>> hybrid backplane where the first few slots are CD slots and the rest
>> are serpentine (3 CD slots for BA23, 5 CD slots for BA123).
> First 4 slots of a BA123 are Q22/CD, not the first 5. Page 22 of the
> PDF, page 1-11, Figure 1-9 Backplane Grant Continuity of the same
> manual referenced above.

Good catch.  I looked it up because I remembered that it was different
but I misread one of the links that mentioned slot 5... slot 5 is the
_first_ Q22 slot.  1-4 are Q22/CD.

Thanks for spotting this.


More information about the cctalk mailing list